---
title: ASME Flange
date: 2024-11-19T07:52:22Z
modified: 2026-08-06T15:02:57Z
permalink: "https://www.longanflange.com/asme-flange/"
type: page
status: publish
excerpt: ""
wpid: 1205
timestamp: 2026-08-06T15:02:57Z
tags: []
---
# Custom ASME/ANSI Flanges for Critical Industrial Projects
In-house forged, machined, and tested to ASME B16.5 & B16.47 standards. DN15–DN4000 available with rapid delivery and custom drilling support.
[ Get Support
](#form)
[ Discover Product >
](#type)
[ Selection Guide >
](#pressureclass)
[ Our Service >
](#service)
## [EXPLORE OUR ASME FLANGES BY TYPES](https://longanflange.com/product_cat/pressure-vessel-flange-series/)
## [Slip On Flange](https://longanflange.com/products/slip-on-flange/)
[ Flange Detail
](/products/slip-on-flange/)
## [Weld Neck Flange](https://longanflange.com/products/weld-neck-flange/)
[ Flange Detail
](/products/weld-neck-flange/)
## [Plate Flange](https://longanflange.com/products/plate-flange/)
[ Flange Detail
](/products/plate-flange/)
## [Blind Flange](https://longanflange.com/products/blind-flange/)
[ Flange Detail
](/products/blind-flange/)
## [Socket Weld Flange](https://longanflange.com/products/socket-weld-flange/)
[ Flange Detail
](/products/socket-weld-flange/)
## [Lap Joint Flange](https://longanflange.com/products/stainless-steel-lap-joint-flange/)
[ Flange Detail
](/products/stainless-steel-lap-joint-flange/)
## [Threaded Flange](https://longanflange.com/products/threaded-flange/)
[ Flange Detail
](/products/threaded-flange/)
## [Custom Flange](/custom-flange/)
[ Flange Detail
](/custom-flange/)
## Custom-Made for Your Project
We provide custom stainless steel flanges with non-standard bores and bolt patterns, precisely machined to ASME B16.5/B16.47, DIN, or TEMA standards — backed by 15-point QC inspection and ISO, CE, PED certifications for global EPC compliance.
[ Get Expert Support
](#form)
## Advanced Forging & Machining Capacity
At Longan, we support machining of flanges up to DN4000 and up to 5 tons per piece, serving EPC contractors in chemical plants, power stations, and offshore facilities.
We handle custom bore machining, special facing, and non-standard drilling patterns with precision CNC control — ensuring perfect integration into your pipeline system.
[ Start Your Inquiry Now
](#form)
# Exhibition
### Request a Custom Flange Quote
Tell us about your project and we’ll get back within 24 hours.
Prenez-vous en charge les brides personnalisées avec des dessins ?
Oui, nous prenons en charge la production OEM basée sur les normes ASME/DIN et vos dessins CAO/PDF.
Quelle est la quantité minimum de commande (MOQ) ?
Pour la plupart des types de brides, la quantité minimale de commande commence à 20 pièces. Pour les brides alésées sur mesure, la quantité minimale de commande peut varier selon la taille.
Combien de temps faut-il pour recevoir un devis ?
Nous répondons sous 24 heures. Pour les projets personnalisés, la révision des dessins peut prendre jusqu'à 48 heures.
Quelles normes soutenez-vous ?
Nous fabriquons selon les normes ASME B16.5, ASME B16.47 Série A/B, DIN, JIS, GOST, EN1092-1 et TEMA.
Puis-je obtenir un rapport de test avant la livraison ?
Yes, we provide PMI reports, dimension inspections, and hydro-pressure test records for each batch.
## CHOOSE YOUR FLANGE PRESSURE CLASS BELOW
### ASME b16.5 Slip On Flange Dimensions
Class 150
Class 300
Class 600
Class 900
Class 1500
Class 150
| Nominal size | Steel Pipe outer diameter | Connection size | flange thickness | flange inner diameter | flange neck big end | flange height | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| DN | NPS | A | Flange outer diameter D | Central circle diameter K | Bolt hole diameter L | Number of bolt holes n | Bolt Th | C | B | N | H |
| 15 | 1/2 | 21.3 | 90 | 60.3 | 16 | 4 | M14 | 9.6 | 22.5 | 30 | 14 |
| 20 | 3/4 | 26.9 | 100 | 69.9 | 16 | 4 | M14 | 11.2 | 27.5 | 38 | 14 |
| 25 | 1 | 33.7 | 110 | 79.4 | 16 | 4 | M14 | 12.7 | 34.5 | 49 | 16 |
| 32 | 1 1/4 | 42.4 | 115 | 88.9 | 16 | 4 | M14 | 14.3 | 43.5 | 59 | 19 |
| 40 | 1 1/2 | 48.3 | 125 | 98.4 | 16 | 4 | M14 | 15.9 | 49.5 | 65 | 21 |
| 50 | 2 | 60.3 | 150 | 120.7 | 18 | 4 | M16 | 17.5 | 61.5 | 78 | 24 |
| 65 | 2 1/2 | 76.1 | 180 | 139.7 | 18 | 4 | M16 | 20.7 | 77.6 | 90 | 27 |
| 80 | 3 | 88.9 | 190 | 152.4 | 18 | 4 | M16 | 22.3 | 90.5 | 108 | 29 |
| 100 | 4 | 114.3 | 230 | 190.5 | 18 | 8 | M16 | 22.3 | 116.0 | 135 | 32 |
| 125 | 5 | 139.7 | 255 | 215.9 | 22 | 8 | M20 | 22.3 | 143.5 | 164 | 35 |
| 150 | 6 | 168.3 | 280 | 241.3 | 22 | 8 | M20 | 23.9 | 170.5 | 192 | 38 |
| 200 | 8 | 219.1 | 345 | 298.5 | 22 | 8 | M20 | 27.0 | 221.5 | 246 | 43 |
| 250 | 10 | 273.0 | 405 | 362 | 26 | 12 | M24 | 28.6 | 276.5 | 305 | 48 |
| 300 | 12 | 323.9 | 485 | 431.8 | 26 | 12 | M24 | 30.2 | 328.0 | 365 | 54 |
| 350 | 14 | 355.6 | 535 | 476.3 | 30 | 12 | M27 | 33.4 | 360.0 | 400 | 56 |
| 400 | 16 | 406.4 | 595 | 539.8 | 30 | 16 | M27 | 35.0 | 411.0 | 457 | 62 |
| 450 | 18 | 457 | 635 | 577.9 | 33 | 16 | M30 | 38.1 | 462.0 | 505 | 67 |
| 500 | 20 | 508 | 700 | 635 | 33 | 20 | M30 | 41.3 | 513.5 | 559 | 71 |
| 600 | 24 | 610 | 815 | 749.3 | 36 | 20 | M33 | 46.1 | 616.5 | 663 | 81 |
Class 300
| Nominal size | Steel Pipe outer diameter | Connection size | flange thickness | flange inner diameter | flange neck big end | flange height | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| DN | NPS | A | Flange outer diameter D | Central circle diameter K | Bolt hole diameter L | Number of bolt holes n | Bolt Th | C | B | N | H |
| 15 | 1/2 | 21.3 | 95 | 66.7 | 16 | 4 | M14 | 12.7 | 22.5 | 38 | 21 |
| 20 | 3/4 | 26.9 | 115 | 82.6 | 18 | 4 | M16 | 14.3 | 27.5 | 48 | 24 |
| 25 | 1 | 33.7 | 125 | 88.9 | 18 | 4 | M16 | 15.9 | 34.5 | 54 | 25 |
| 32 | 1 1/4 | 42.4 | 135 | 98.4 | 18 | 4 | M16 | 17.5 | 43.5 | 64 | 25 |
| 40 | 1 1/2 | 48.3 | 155 | 114.3 | 22 | 4 | M20 | 19.1 | 49.5 | 70 | 29 |
| 50 | 2 | 60.3 | 165 | 127 | 18 | 8 | M16 | 20.7 | 61.5 | 84 | 32 |
| 65 | 2 1/2 | 76.1 | 190 | 149.2 | 22 | 8 | M20 | 23.9 | 77.6 | 100 | 37 |
| 80 | 3 | 88.9 | 210 | 168.3 | 22 | 8 | M20 | 27 | 90.5 | 117 | 41 |
| 100 | 4 | 114.3 | 255 | 200 | 22 | 8 | M20 | 30.2 | 116 | 146 | 46 |
| 125 | 5 | 139.7 | 280 | 235 | 22 | 8 | M20 | 33.4 | 143.5 | 178 | 49 |
| 150 | 6 | 168.3 | 320 | 269.9 | 22 | 12 | M20 | 35 | 170.5 | 206 | 51 |
| 200 | 8 | 219.1 | 380 | 330.2 | 26 | 12 | M24 | 39.7 | 221.5 | 260 | 60 |
| 250 | 10 | 273 | 445 | 387.4 | 30 | 16 | M27 | 46.1 | 276.5 | 321 | 65 |
| 300 | 12 | 323.9 | 520 | 450.8 | 33 | 16 | M30 | 49.3 | 328 | 375 | 71 |
| 350 | 14 | 355.6 | 585 | 514.4 | 33 | 20 | M30 | 52.4 | 360 | 425 | 75 |
| 400 | 16 | 406.4 | 650 | 571.5 | 36 | 20 | M33 | 55.6 | 411 | 483 | 81 |
| 450 | 18 | 457 | 710 | 628.6 | 36 | 24 | M33 | 58.8 | 462 | 533 | 87 |
| 500 | 20 | 508 | 775 | 685.8 | 36 | 24 | M33 | 62 | 513.5 | 587 | 94 |
| 600 | 24 | 610 | 915 | 812.8 | 42 | 24 | M39X3 | 68.3 | 616.5 | 702 | 105 |
Class 600
| Nominal size | Steel Pipe outer diameter | Connection size | flange thickness | flange inner diameter | flange neck big end | flange height | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| DN | NPS | A | Flange outer diameter D | Central circle diameter K | Bolt hole diameter L | Number of bolt holes n | Bolt Th | C | B | N | H |
| 15 | 1/2 | 21.3 | 95 | 66.7 | 16 | 4 | M14 | 14.3 | 22.5 | 38 | 22 |
| 20 | 3/4 | 26.9 | 115 | 82.6 | 18 | 4 | M16 | 15.9 | 27.5 | 48 | 25 |
| 25 | 1 | 33.7 | 125 | 88.9 | 18 | 4 | M16 | 17.5 | 34.5 | 54 | 27 |
| 32 | 1 1/4 | 42.4 | 135 | 88.4 | 18 | 4 | M16 | 20.7 | 43.5 | 64 | 29 |
| 40 | 1 1/2 | 48.3 | 155 | 114.3 | 22 | 4 | M20 | 22.3 | 49.5 | 70 | 32 |
| 50 | 2 | 60.3 | 165 | 127 | 18 | 8 | M16 | 25.4 | 61.5 | 84 | 37 |
| 65 | 2 1/2 | 76.1 | 190 | 149.2 | 22 | 8 | M20 | 28.6 | 77.6 | 100 | 41 |
| 80 | 3 | 88.9 | 210 | 168.3 | 22 | 8 | M20 | 31.8 | 90.5 | 117 | 46 |
| 100 | 4 | 114.3 | 275 | 215.9 | 26 | 8 | M24 | 38.1 | 116 | 152 | 54 |
| 125 | 5 | 139.7 | 330 | 266.7 | 30 | 8 | M27 | 44.5 | 143.5 | 189 | 60 |
| 150 | 6 | 168.3 | 355 | 292.1 | 30 | 12 | M27 | 47.7 | 170.5 | 222 | 67 |
| 200 | 8 | 219.1 | 420 | 349.2 | 33 | 12 | M30 | 55.6 | 221.5 | 273 | 76 |
| 250 | 10 | 273 | 510 | 431.8 | 36 | 16 | M33 | 63.5 | 276.5 | 343 | 86 |
| 300 | 12 | 323.9 | 560 | 489 | 36 | 20 | M33 | 66.7 | 328 | 400 | 92 |
| 350 | 14 | 355.6 | 605 | 527 | 39 | 20 | M36X3 | 69.9 | 360 | 432 | 94 |
| 400 | 16 | 406.4 | 685 | 603.2 | 42 | 20 | M39X3 | 76.2 | 411 | 495 | 106 |
| 450 | 18 | 457 | 745 | 654 | 45 | 20 | M42X3 | 82.6 | 462 | 546 | 117 |
| 500 | 20 | 508 | 815 | 723.9 | 45 | 24 | M42X3 | 88.9 | 513.5 | 610 | 127 |
| 600 | 24 | 610 | 940 | 838.2 | 51 | 24 | M48X3 | 101.6 | 616.5 | 718 | 140 |
Class 900
| Nominal size | Steel Pipe outer diameter | Connection size | flange thickness | flange inner diameter | flange neck big end | flange height | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| DN | NPS | A | Flange outer diameter D | Central circle diameter K | Bolt hole diameter L | Number of bolt holes n | Bolt Th | C | B | N | H |
| 15 | 1/2 | 21.3 | 120 | 82.6 | 22 | 4 | M20 | 22.3 | 22.5 | 38 | 32 |
| 20 | 3/4 | 26.9 | 130 | 88.9 | 22 | 4 | M20 | 25.4 | 27.5 | 44 | 35 |
| 25 | 1 | 33.7 | 150 | 101.6 | 26 | 4 | M24 | 28.6 | 34.5 | 52 | 41 |
| 32 | 1 1/4 | 42.4 | 160 | 111.1 | 26 | 4 | M24 | 28.6 | 43.5 | 64 | 41 |
| 40 | 1 1/2 | 48.3 | 180 | 123.8 | 30 | 4 | M27 | 31.8 | 49.5 | 70 | 44 |
| 50 | 2 | 60.3 | 215 | 165.1 | 26 | 8 | M24 | 38.1 | 61.5 | 105 | 57 |
| 65 | 2 1/2 | 76.1 | 245 | 190.5 | 30 | 8 | M27 | 41.3 | 77.6 | 124 | 64 |
| 80 | 3 | 88.9 | 240 | 190.5 | 26 | 8 | M24 | 38.1 | 90.5 | 127 | 54 |
| 100 | 4 | 114.3 | 290 | 235 | 33 | 8 | M30 | 44.5 | 116 | 159 | 70 |
| 125 | 5 | 139.7 | 350 | 279.4 | 36 | 8 | M33 | 50.8 | 143.5 | 190 | 79 |
| 150 | 6 | 168.3 | 380 | 317.5 | 33 | 12 | M30 | 55.6 | 170.5 | 235 | 86 |
| 200 | 8 | 219.1 | 470 | 393.7 | 39 | 12 | M36X3 | 63.5 | 221.5 | 298 | 102 |
| 250 | 10 | 273 | 545 | 469.9 | 39 | 16 | M36X3 | 69.9 | 276.5 | 368 | 108 |
| 300 | 12 | 323.9 | 610 | 533.4 | 39 | 20 | M36X3 | 79.4 | 328 | 419 | 117 |
| 350 | 14 | 355.6 | 640 | 558.8 | 42 | 20 | M39X3 | 85.8 | 360 | 451 | 130 |
| 400 | 16 | 406.4 | 705 | 616 | 45 | 20 | M42X3 | 88.9 | 411 | 508 | 133 |
| 450 | 18 | 457 | 785 | 685.8 | 51 | 20 | M48X3 | 101.6 | 462 | 565 | 152 |
| 500 | 20 | 508 | 855 | 749.3 | 55 | 20 | M52X3 | 108 | 513.5 | 622 | 159 |
| 600 | 24 | 610 | 1040 | 901.7 | 68 | 20 | M64X3 | 139.7 | 616.5 | 749 | 203 |
Class 1500
| Nominal size | Steel Pipe outer diameter | Connection size | flange thickness | flange inner diameter | flange neck big end | flange height | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| DN | NPS | A | Flange outer diameter D | Central circle diameter K | Bolt hole diameter L | Number of bolt holes n | Bolt Th | C | B | N | H |
| 15 | 1/2 | 21.3 | 120 | 82.6 | 22 | 4 | M20 | 22.3 | 22.5 | 38 | 32 |
| 20 | 3/4 | 26.9 | 130 | 88.9 | 22 | 4 | M20 | 25.4 | 27.5 | 44 | 35 |
| 25 | 1 | 33.7 | 150 | 101.6 | 26 | 4 | M24 | 28.6 | 34.5 | 52 | 41 |
| 32 | 1 1/4 | 42.4 | 160 | 111.1 | 26 | 4 | M24 | 28.6 | 43.5 | 64 | 41 |
| 40 | 1 1/2 | 48.3 | 180 | 123.8 | 30 | 4 | M27 | 31.8 | 49.5 | 70 | 44 |
| 50 | 2 | 60.3 | 215 | 165.1 | 26 | 8 | M24 | 38.1 | 61.5 | 105 | 57 |
| 65 | 2 1/2 | 76.1 | 245 | 190.5 | 30 | 8 | M27 | 41.3 | 77.6 | 124 | 64 |
### ASME b16.5 Weld Neck Flange Dimensions
Class 150
Class 300
Class 600
Class 900
Class 1500
Class 2500
Class 150
| Nominal size | Steel Pipe outer diameter | Connection size | flange thickness | flange inner diameter | flange neck big end | flange height | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| DN | NPS | A | Flange outer diameter D | Central circle diameter K | Bolt hole diameter L | Number of bolt holes n | Bolt Th | C | B | N | H |
| 15 | 1/2 | 21.3 | 90 | 60.3 | 16 | 4 | M14 | 9.6 | 15.5 | 30 | 46 |
| 20 | 3/4 | 26.9 | 100 | 69.9 | 16 | 4 | M14 | 11.2 | 21 | 38 | 51 |
| 25 | 1 | 33.7 | 110 | 79.4 | 16 | 4 | M14 | 12.7 | 27 | 49 | 54 |
| 32 | 1 1/4 | 42.4 | 115 | 88.9 | 16 | 4 | M14 | 14.3 | 35 | 59 | 56 |
| 40 | 1 1/2 | 48.3 | 125 | 98.4 | 16 | 4 | M14 | 15.9 | 41 | 65 | 60 |
| 50 | 2 | 60.3 | 150 | 120.7 | 18 | 4 | M16 | 17.5 | 52 | 78 | 62 |
| 65 | 2 1/2 | 76.1 | 180 | 139.7 | 18 | 4 | M16 | 20.7 | 66 | 90 | 68 |
| 80 | 3 | 88.9 | 190 | 152.4 | 18 | 4 | M16 | 22.3 | 77.5 | 108 | 68 |
| 100 | 4 | 114.3 | 230 | 190.5 | 18 | 8 | M16 | 22.3 | 101.5 | 135 | 75 |
| 125 | 5 | 139.7 | 255 | 215.9 | 22 | 8 | M20 | 22.3 | 127 | 164 | 87 |
| 150 | 6 | 168.3 | 280 | 241.3 | 22 | 8 | M20 | 23.9 | 154 | 192 | 87 |
| 200 | 8 | 219.1 | 345 | 298.5 | 22 | 8 | M20 | 27 | 203 | 246 | 100 |
| 250 | 10 | 273 | 405 | 362 | 26 | 12 | M24 | 28.6 | 255 | 305 | 100 |
| 300 | 12 | 323.9 | 485 | 431.8 | 26 | 12 | M24 | 30.2 | 303.5 | 365 | 113 |
| 350 | 14 | 355.6 | 535 | 476.3 | 30 | 12 | M27 | 33.4 | – | 400 | 125 |
| 400 | 16 | 406.4 | 595 | 539.8 | 30 | 16 | M27 | 35 | – | 457 | 125 |
| 450 | 18 | 457 | 635 | 577.9 | 33 | 16 | M30 | 38.1 | – | 505 | 138 |
| 500 | 20 | 508 | 700 | 635 | 33 | 20 | M30 | 41.3 | – | 559 | 143 |
| 600 | 24 | 610 | 815 | 749.3 | 36 | 20 | M33 | 46.1 | – | 663 | 151 |
Class 300
| Nominal size | Steel Pipe outer diameter | Connection size | flange thickness | flange inner diameter | flange neck big end | flange height | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| DN | NPS | A | Flange outer diameter D | Central circle diameter K | Bolt hole diameter L | Number of bolt holes n | Bolt Th | C | B | N | H |
| 15 | 1/2 | 21.3 | 95 | 66.7 | 16 | 4 | M14 | 12.7 | 15.5 | 38 | 51 |
| 20 | 3/4 | 26.9 | 115 | 82.6 | 18 | 4 | M16 | 14.3 | 21 | 48 | 56 |
| 25 | 1 | 33.7 | 125 | 88.9 | 18 | 4 | M16 | 15.9 | 27 | 54 | 60 |
| 32 | 1 1/4 | 42.4 | 135 | 98.4 | 18 | 4 | M16 | 17.5 | 35 | 64 | 64 |
| 40 | 1 1/2 | 48.3 | 155 | 114.3 | 22 | 4 | M20 | 19.1 | 41 | 70 | 67 |
| 50 | 2 | 60.3 | 165 | 127 | 18 | 8 | M16 | 20.7 | 52 | 84 | 68 |
| 65 | 2 1/2 | 76.1 | 190 | 149.2 | 22 | 8 | M20 | 23.9 | 66 | 100 | 75 |
| 80 | 3 | 88.9 | 210 | 168.3 | 22 | 8 | M20 | 27 | 77.5 | 117 | 78 |
| 100 | 4 | 114.3 | 255 | 200 | 22 | 8 | M20 | 30.2 | 101.5 | 146 | 84 |
| 125 | 5 | 139.7 | 280 | 235 | 22 | 8 | M20 | 33.4 | 127 | 178 | 97 |
| 150 | 6 | 168.3 | 320 | 269.9 | 22 | 12 | M20 | 35 | 154 | 206 | 97 |
| 200 | 8 | 219.1 | 380 | 330.2 | 26 | 12 | M24 | 39.7 | 203 | 260 | 110 |
| 250 | 10 | 273 | 445 | 387.4 | 30 | 16 | M27 | 46.1 | 255 | 321 | 116 |
| 300 | 12 | 323.9 | 520 | 450.8 | 33 | 16 | M30 | 49.3 | 303.5 | 375 | 129 |
| 350 | 14 | 355.6 | 585 | 514.4 | 33 | 20 | M30 | 52.4 | – | 425 | 141 |
| 400 | 16 | 406.4 | 650 | 571.5 | 36 | 20 | M33 | 55.6 | – | 483 | 144 |
| 450 | 18 | 457 | 710 | 628.6 | 36 | 24 | M33 | 58.8 | – | 533 | 157 |
| 500 | 20 | 508 | 775 | 685.8 | 36 | 24 | M33 | 62 | – | 587 | 160 |
| 600 | 24 | 610 | 915 | 812.8 | 42 | 24 | M39X3 | 68.3 | – | 702 | 167 |
Class 600
| Nominal size | Steel Pipe outer diameter | Connection size | flange thickness | flange inner diameter | flange neck big end | flange height | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| DN | NPS | A | Flange outer diameter D | Central circle diameter K | Bolt hole diameter L | Number of bolt holes n | Bolt Th | C | B | N | H |
| 15 | 1/2 | 21.3 | 95 | 66.7 | 16 | 4 | M14 | 14.3 | – | 38 | 52 |
| 20 | 3/4 | 26.9 | 115 | 82.6 | 18 | 4 | M16 | 15.9 | – | 48 | 57 |
| 25 | 1 | 33.7 | 125 | 88.9 | 18 | 4 | M16 | 17.5 | – | 54 | 62 |
| 32 | 1 1/4 | 42.4 | 135 | 98.4 | 18 | 4 | M16 | 20.7 | – | 64 | 67 |
| 40 | 1 1/2 | 48.3 | 155 | 114.3 | 22 | 4 | M20 | 22.3 | – | 70 | 70 |
| 50 | 2 | 60.3 | 165 | 127 | 18 | 8 | M16 | 25.4 | – | 84 | 73 |
| 65 | 2 1/2 | 76.1 | 190 | 149.2 | 22 | 8 | M20 | 28.6 | – | 100 | 79 |
| 80 | 3 | 88.9 | 210 | 168.3 | 22 | 8 | M20 | 31.8 | – | 117 | 83 |
| 100 | 4 | 114.3 | 275 | 215.9 | 26 | 8 | M24 | 38.1 | – | 152 | 102 |
| 125 | 5 | 139.7 | 330 | 266.7 | 30 | 8 | M27 | 44.5 | – | 189 | 114 |
| 150 | 6 | 168.3 | 355 | 292.1 | 30 | 12 | M27 | 47.7 | – | 222 | 117 |
| 200 | 8 | 219.1 | 420 | 349.2 | 33 | 12 | M30 | 55.6 | – | 273 | 133 |
| 250 | 10 | 273 | 510 | 431.8 | 36 | 16 | M33 | 63.5 | – | 343 | 152 |
| 300 | 12 | 323.9 | 560 | 489 | 36 | 20 | M33 | 66.7 | – | 400 | 156 |
| 350 | 14 | 355.6 | 605 | 527 | 39 | 20 | M36X3 | 69.9 | – | 432 | 165 |
| 400 | 16 | 406.4 | 685 | 603.2 | 42 | 20 | M39X3 | 76.2 | – | 495 | 178 |
| 450 | 18 | 457 | 745 | 654 | 45 | 20 | M42X3 | 82.6 | – | 546 | 184 |
| 500 | 20 | 508 | 815 | 723.9 | 45 | 24 | M42X3 | 88.9 | – | 610 | 190 |
| 600 | 24 | 610 | 940 | 838.2 | 51 | 24 | M48X3 | 101.6 | – | 718 | 203 |
Class 900
| Nominal size | Steel Pipe outer diameter | Connection size | flange thickness | flange inner diameter | flange neck big end | flange height | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| DN | NPS | A | Flange outer diameter D | Central circle diameter K | Bolt hole diameter L | Number of bolt holes n | Bolt Th | C | B | N | H |
| 15 | 1/2 | 21.3 | 120 | 82.6 | 22 | 4 | M20 | 22.3 | – | 38 | 60 |
| 20 | 3/4 | 26.9 | 130 | 88.9 | 22 | 4 | M20 | 25.4 | – | 44 | 70 |
| 25 | 1 | 33.7 | 150 | 101.6 | 26 | 4 | M24 | 28.6 | – | 52 | 73 |
| 32 | 1 1/4 | 42.4 | 160 | 111.1 | 26 | 4 | M24 | 28.6 | – | 64 | 73 |
| 40 | 1 1/2 | 48.3 | 180 | 123.8 | 30 | 4 | M27 | 31.8 | – | 70 | 83 |
| 50 | 2 | 60.3 | 215 | 165.1 | 26 | 8 | M24 | 38.1 | – | 105 | 102 |
| 65 | 2 1/2 | 76.1 | 245 | 190.5 | 30 | 8 | M27 | 41.3 | – | 124 | 105 |
| 80 | 3 | 88.9 | 240 | 190.5 | 26 | 8 | M24 | 38.1 | – | 127 | 102 |
| 100 | 4 | 114.3 | 290 | 235 | 33 | 8 | M30 | 44.5 | – | 159 | 114 |
| 125 | 5 | 139.7 | 350 | 279.4 | 36 | 8 | M33 | 50.8 | – | 190 | 127 |
| 150 | 6 | 168.3 | 380 | 317.5 | 33 | 12 | M30 | 55.6 | – | 235 | 140 |
| 200 | 8 | 219.1 | 470 | 393.7 | 39 | 12 | M36X3 | 63.5 | – | 298 | 162 |
| 250 | 10 | 273 | 545 | 469.9 | 39 | 16 | M36X3 | 69.9 | – | 368 | 184 |
| 300 | 12 | 323.9 | 610 | 533.4 | 39 | 20 | M36X3 | 79.4 | – | 419 | 200 |
| 350 | 14 | 355.6 | 640 | 558.8 | 42 | 20 | M39X3 | 85.8 | – | 451 | 213 |
| 400 | 16 | 406.4 | 705 | 616 | 45 | 20 | M42X3 | 88.9 | – | 508 | 216 |
| 450 | 18 | 457 | 785 | 685.8 | 51 | 20 | M48X3 | 101.6 | – | 565 | 229 |
| 500 | 20 | 508 | 855 | 749.3 | 55 | 20 | M52X3 | 108 | – | 622 | 248 |
| 600 | 24 | 610 | 1040 | 901.7 | 68 | 20 | M64X3 | 139.7 | – | 749 | 292 |
Class 1500
| Nominal size | Steel Pipe outer diameter | Connection size | flange thickness | flange inner diameter | flange neck big end | flange height | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| DN | NPS | A | Flange outer diameter D | Central circle diameter K | Bolt hole diameter L | Number of bolt holes n | Bolt Th | C | B | N | H |
| 15 | 1/2 | 21.3 | 120 | 82.6 | 22 | 4 | M20 | 22.3 | – | 38 | 60 |
| 20 | 3/4 | 26.9 | 130 | 88.9 | 22 | 4 | M20 | 25.4 | – | 44 | 70 |
| 25 | 1 | 33.7 | 150 | 101.6 | 26 | 4 | M24 | 28.6 | – | 52 | 73 |
| 32 | 1 1/4 | 42.4 | 160 | 111.1 | 26 | 4 | M24 | 28.6 | – | 64 | 73 |
| 40 | 1 1/2 | 48.3 | 180 | 123.8 | 30 | 4 | M27 | 31.8 | – | 70 | 83 |
| 50 | 2 | 60.3 | 215 | 165.1 | 26 | 8 | M24 | 38.1 | – | 105 | 102 |
| 65 | 2 1/2 | 76.1 | 245 | 190.5 | 30 | 8 | M27 | 41.3 | – | 124 | 105 |
| 80 | 3 | 88.9 | 265 | 203.2 | 33 | 8 | M30 | 47.7 | – | 133 | 117 |
| 100 | 4 | 114.3 | 310 | 241.3 | 36 | 8 | M33 | 54 | – | 162 | 124 |
| 125 | 5 | 139.7 | 375 | 292.1 | 42 | 8 | M39X3 | 73.1 | – | 197 | 156 |
| 150 | 6 | 168.3 | 395 | 317.5 | 39 | 12 | M36X3 | 82.6 | – | 229 | 171 |
| 200 | 8 | 219.1 | 485 | 393.7 | 45 | 12 | M42X3 | 92.1 | – | 292 | 213 |
| 250 | 10 | 273 | 585 | 482.6 | 51 | 12 | M48X3 | 108 | – | 368 | 254 |
| 300 | 12 | 323.9 | 675 | 571.5 | 55 | 16 | M52X3 | 123.9 | – | 451 | 283 |
| 350 | 14 | 355.6 | 750 | 635 | 60 | 16 | M56X3 | 133.4 | – | 495 | 298 |
| 400 | 16 | 406.4 | 825 | 704.8 | 68 | 16 | M64X3 | 146.1 | – | 552 | 311 |
| 450 | 18 | 457 | 915 | 774.7 | 74 | 16 | M70X3 | 162 | – | 597 | 327 |
| 500 | 20 | 508 | 985 | 831.8 | 80 | 16 | M76X3 | 177.8 | – | 641 | 356 |
| 600 | 24 | 610 | 1170 | 990.6 | 94 | 16 | M90X3 | 203.2 | – | 762 | 406 |
Class 2500
| Nominal size | Steel Pipe outer diameter | Connection size | flange thickness | flange inner diameter | flange neck big end | flange height | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| DN | NPS | A | Flange outer diameter D | Central circle diameter K | Bolt hole diameter L | Number of bolt holes n | Bolt Th | C | B | N | H |
| 15 | 1/2 | 21.3 | 135 | 88.9 | 22 | 4 | M20 | 30.2 | – | 43 | 73 |
| 20 | 3/4 | 26.9 | 140 | 95.2 | 22 | 4 | M20 | 31.8 | – | 51 | 79 |
| 25 | 1 | 33.7 | 160 | 108 | 26 | 4 | M24 | 35 | – | 57 | 89 |
| 32 | 1 1/4 | 42.4 | 185 | 130.2 | 30 | 4 | M27 | 38.1 | – | 73 | 95 |
| 40 | 1 1/2 | 48.3 | 205 | 146 | 33 | 4 | M30 | 44.5 | – | 79 | 111 |
| 50 | 2 | 60.3 | 235 | 171.4 | 30 | 8 | M27 | 50.9 | – | 95 | 127 |
| 65 | 21/2 | 76.1 | 265 | 196.8 | 33 | 8 | M30 | 57.2 | – | 114 | 143 |
| 80 | 3 | 88.9 | 305 | 228.6 | 36 | 8 | M33 | 66.7 | – | 133 | 168 |
| 100 | 4 | 114.3 | 355 | 273 | 42 | 8 | M39X3 | 76.2 | – | 165 | 190 |
| 125 | 5 | 139.7 | 420 | 323.8 | 48 | 8 | M45X3 | 92.1 | – | 203 | 229 |
| 150 | 6 | 168.3 | 485 | 368.3 | 55 | 8 | M52X3 | 108 | – | 235 | 273 |
| 200 | 8 | 219.1 | 550 | 438.2 | 55 | 12 | M52X3 | 127 | – | 305 | 318 |
| 250 | 10 | 273 | 675 | 539.8 | 68 | 12 | M64X3 | 165.1 | – | 375 | 419 |
| 300 | 12 | 323.9 | 760 | 619.1 | 74 | 12 | M70X3 | 184.2 | – | 441 | 464 |
### ASME b16.5 Socket Weld Flange Dimensions
Class 150
Class 300
Class 600
Class 900
Class 150
| Nominal size | Steel pipe outer diameter A | Flange outer diameter D | Connection size | flange thickness C | Flange inner diameter B1 | Socket | Flange neck big end N | Flange height H | Theoretical weight Kg | | | | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| DN | NPS | Bolt hole center circle diameter K | Bold hole diameter L | Bolt hole Quantity n(pieces) | B2 | U | | | | | | | | | | | |
| 15 | 1/2 | 21.3 | 90 | 88.9 | 60.3 | 16 | 15.7 | 4 | 9.6 | 15.5 | 15.7 | 22.5 | 22.4 | 10 | 30 | 14 | 0.42 |
| 20 | 3/4 | 26.9 | 100 | 98.6 | 69.9 | 16 | 15.7 | 4 | 11.2 | 21 | 20.8 | 27.5 | 27.7 | 11 | 38 | 14 | 0.59 |
| 25 | 1 | 33.7 | 110 | 108 | 79.4 | 16 | 15.7 | 4 | 12.7 | 27 | 26.7 | 34.5 | 34.5 | 13 | 49 | 16 | 0.81 |
| 32 | 1 1/4 | 42.4 | 115 | 117.3 | 88.9 | 16 | 15.7 | 4 | 14.3 | 35 | 35.1 | 43.5 | 43.2 | 14 | 59 | 19 | 1.07 |
| 40 | 1 1/2 | 48.3 | 125 | 127 | 98.4 | 16 | 15.7 | 4 | 15.9 | 41 | 40.9 | 49.5 | 49.5 | 16 | 65 | 21 | 1.36 |
| 50 | 2 | 60.3 | 150 | 152.4 | 120.7 | 18 | 19.1 | 4 | 17.5 | 52 | 52.6 | 61.5 | 62 | 17 | 78 | 24 | 2.1 |
| 65 | 2 1/2 | 76.1 | 180 | 177.8 | 139.7 | 18 | 19.1 | 4 | 20.7 | 66 | 62.7 | 77.6 | 74.7 | 19 | 90 | 27 | 3.33 |
| 80 | 3 | 88.9 | 190 | 190.5 | 152.4 | 18 | 19.1 | 4 | 22.3 | 77.5 | 78 | 90.5 | 90.7 | 21 | 108 | 29 | 3.9 |
Note: The inner diameter B1 of the flange is determined by the wall thickness of the steel pipe. The user should indicate it when ordering. The flange inner diameter B1 listed in the table is equivalent to a steel pipe with a wall thickness of Sch40
Class 300
| Nominal size | Steel pipe outer diameter A | Flange outer diameter D | Connection size | flange thickness C | Flange inner diameter B1 | Socket | Flange neck big end N | Flange height H | Theoretical weight Kg | | | | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| DN | NPS | Bolt hole center circle diameter K | Bold hole diameter L | Bolt hole Quantity n(pieces) | B2 | U | | | | | | | | | | | |
| 15 | ½ | 21.3 | 95 | 88.9 | 66.7 | 16 | 15.7 | 4 | 12.7 | 15.5 | 15.7 | 22.5 | 22.4 | 10 | 38 | 21 | 0.66 |
| 20 | ¾ | 26.9 | 115 | 98.6 | 82.6 | 18 | 15.7 | 4 | 14.3 | 21 | 20.8 | 27.5 | 27.7 | 11 | 48 | 24 | 1.15 |
| 25 | 1 | 33.7 | 125 | 108 | 88.9 | 18 | 15.7 | 4 | 15.9 | 27 | 26.7 | 34.5 | 34.5 | 13 | 54 | 25 | 1.4 |
| 32 | 1 ¼ | 42.4 | 135 | 117.3 | 98.4 | 18 | 15.7 | 4 | 17.5 | 35 | 35.1 | 43.5 | 43.2 | 14 | 64 | 25 | 1.75 |
| 40 | 1 ½ | 48.3 | 155 | 127 | 114.3 | 22 | 15.7 | 4 | 19.1 | 41 | 40.9 | 49.5 | 49.5 | 16 | 70 | 29 | 2.55 |
| 50 | 2 | 60.3 | 165 | 152.4 | 127 | 18 | 19.1 | 8 | 20.7 | 52 | 52.6 | 61.5 | 62 | 17 | 84 | 32 | 2.93 |
| 65 | 2 ½ | 76.1 | 190 | 177.8 | 149.2 | 22 | 19.1 | 8 | 23.9 | 66 | 62.7 | 77.6 | 74.7 | 19 | 100 | 37 | 4.4 |
| 80 | 3 | 88.9 | 210 | 190.5 | 168.3 | 22 | 19.1 | 8 | 27 | 77.5 | 78 | 90.5 | 90.7 | 21 | 117 | 41 | 5.92 |
Note: The inner diameter B1 of the flange is determined by the wall thickness of the steel pipe. The user should indicate it when ordering. The flange inner diameter B1 listed in the table is equivalent to a steel pipe with a wall thickness of Sch40
Class 600
| Nominal size | Steel pipe outer diameter A | Flange outer diameter D | Connection size | flange thickness C | Flange inner diameter B1 | Socket | Flange neck big end N | Flange height H | Theoretical weight Kg | | | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| DN | NPS | Bolt hole center circle diameter K | Bold hole diameter L | Bolt hole Quantity n(pieces) | B2 | U | | | | | | | | | | |
| 15 | 1/2 | 21.3 | 95 | 88.9 | 66.7 | 16 | 15.7 | 4 | 14.3 | – | 22.5 | 22.4 | 10 | 38 | 22 | 0.76 |
| 20 | 3/4 | 26.9 | 115 | 98.6 | 82.6 | 18 | 15.7 | 4 | 15.9 | – | 27.5 | 27.7 | 11 | 48 | 25 | 1.29 |
| 25 | 1 | 33.7 | 125 | 108 | 88.9 | 18 | 15.7 | 4 | 17.5 | – | 34.5 | 34.5 | 13 | 54 | 27 | 1.55 |
| 32 | 1 1/4 | 424 | 135 | 117.3 | 98.4 | 18 | 15.7 | 4 | 20.7 | – | 43.5 | 43.2 | 14 | 64 | 29 | 2.06 |
| 40 | 1 1/2 | 48.3 | 155 | 127 | 114.3 | 22 | 15.7 | 4 | 22.3 | – | 49.5 | 49.5 | 16 | 70 | 32 | 3.00 |
| 50 | 2 | 60.3 | 165 | 152.4 | 127 | 18 | 19.1 | 8 | 25.4 | – | 61.5 | 62 | 17 | 84 | 37 | 3.67 |
| 65 | 2 1/2 | 76.1 | 190 | 177.8 | 149.2 | 22 | 19.1 | 8 | 28.6 | – | 77.6 | 74.7 | 19 | 100 | 41 | 5.35 |
| 80 | 3 | 88.9 | 210 | 190.5 | 168.3 | 22 | 19.1 | 8 | 31.8 | – | 90.5 | 90.7 | 21 | 117 | 46 | 7.06 |
Note: The inner diameter B1 of the flange is determined by the wall thickness of the steel pipe. The user should indicate it when ordering. The flange inner diameter B1 listed in the table is equivalent to a steel pipe with a wall thickness of Sch40
Class 900
| Nominal size | Steel pipe outer diameter A | Flange outer diameter D | Connection size | flange thickness C | Flange inner diameter B1 | Socket | Flange neck big end N | Flange height H | Theoretical weight Kg | | | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| DN | NPS | Bolt hole center circle diameter K | Bold hole diameter L | Bolt hole Quantity n(pieces) | B2 | U | | | | | | | | | | |
| 15 | ½ | 21.3 | 120 | 120.6 | 82.6 | 22 | 22.3 | 4 | 22.3 | – | 22.5 | 22.4 | 10 | 38 | 32 | 1.8 |
| 20 | ¾ | 26.9 | 130 | 130 | 88.9 | 22 | 22.3 | 4 | 25.4 | – | 27.5 | 27.7 | 11 | 44 | 35 | 2.41 |
| 25 | 1 | 33.7 | 150 | 149.3 | 101.6 | 26 | 25.4 | 4 | 28.6 | – | 34.5 | 34.5 | 13 | 52 | 41 | 3.55 |
| 32 | 1¼ | 42.4 | 160 | 158.7 | 111.1 | 26 | 25.4 | 4 | 28.6 | – | 43.5 | 43.2 | 14 | 64 | 41 | 4.02 |
| 40 | 1½ | 48.3 | 180 | 177.8 | 123.8 | 30 | 28.4 | 4 | 31.8 | – | 49.5 | 49.5 | 16 | 70 | 44 | 5.45 |
| 50 | 2 | 60.3 | 215 | 215.9 | 165.1 | 26 | 25.4 | 8 | 38.1 | – | 61.5 | 62 | 17 | 105 | 57 | 10.2 |
| 65 | 2½ | 76.1 | 245 | 244.3 | 190.5 | 30 | 28.4 | 8 | 41.3 | – | 77.6 | 74.7 | 19 | 124 | 64 | 13.9 |
Note: The inner diameter B1 of the flange is determined by the wall thickness of the steel pipe. The user should indicate it when ordering. The flange inner diameter B1 listed in the table is equivalent to a steel pipe with a wall thickness of Sch40
## PRODUCT CATALOG
Get Instant Data & Drawings for Your custom flange Solution
### ASME b16.5 Threaded Flange Dimensions
Class 150
Class 300
Class 150
| Nominal size | Steel Pipe outer diameter | Connection size | flange thickness | flange inner diameter | flange neck big end | flange height | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| DN | NPS | A | Flange outer diameter D | Central circle diameter K | Bolt hole diameter L | Number of bolt holes n | Bolt Th | C | B | N | H |
| 15 | 1/2 | 21.3 | 90 | 60.3 | 16 | 4 | M14 | 9.6 | 15.5 | 30 | 46 |
| 20 | 3/4 | 26.9 | 100 | 69.9 | 16 | 4 | M14 | 11.2 | 21 | 38 | 51 |
| 25 | 1 | 33.7 | 110 | 79.4 | 16 | 4 | M14 | 12.7 | 27 | 49 | 54 |
| 32 | 1 1/4 | 42.4 | 115 | 88.9 | 16 | 4 | M14 | 14.3 | 35 | 59 | 56 |
| 40 | 1 1/2 | 48.3 | 125 | 98.4 | 16 | 4 | M14 | 15.9 | 41 | 65 | 60 |
| 50 | 2 | 60.3 | 150 | 120.7 | 18 | 4 | M16 | 17.5 | 52 | 78 | 62 |
| 65 | 2 1/2 | 76.1 | 180 | 139.7 | 18 | 4 | M16 | 20.7 | 66 | 90 | 68 |
| 80 | 3 | 88.9 | 190 | 152.4 | 18 | 4 | M16 | 22.3 | 77.5 | 108 | 68 |
| 100 | 4 | 114.3 | 230 | 190.5 | 18 | 8 | M16 | 22.3 | 101.5 | 135 | 75 |
| 125 | 5 | 139.7 | 255 | 215.9 | 22 | 8 | M20 | 22.3 | 127 | 164 | 87 |
| 150 | 6 | 168.3 | 280 | 241.3 | 22 | 8 | M20 | 23.9 | 154 | 192 | 87 |
| 200 | 8 | 219.1 | 345 | 298.5 | 22 | 8 | M20 | 27 | 203 | 246 | 100 |
| 250 | 10 | 273 | 405 | 362 | 26 | 12 | M24 | 28.6 | 255 | 305 | 100 |
| 300 | 12 | 323.9 | 485 | 431.8 | 26 | 12 | M24 | 30.2 | 303.5 | 365 | 113 |
| 350 | 14 | 355.6 | 535 | 476.3 | 30 | 12 | M27 | 33.4 | – | 400 | 125 |
| 400 | 16 | 406.4 | 595 | 539.8 | 30 | 16 | M27 | 35 | – | 457 | 125 |
| 450 | 18 | 457 | 635 | 577.9 | 33 | 16 | M30 | 38.1 | – | 505 | 138 |
| 500 | 20 | 508 | 700 | 635 | 33 | 20 | M30 | 41.3 | – | 559 | 143 |
| 600 | 24 | 610 | 815 | 749.3 | 36 | 20 | M33 | 46.1 | – | 663 | 151 |
Class 300
| Nominal size | Steel Pipe outer diameter | Connection size | flange thickness | flange inner diameter | flange neck big end | flange height | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| DN | NPS | A | Flange outer diameter D | Central circle diameter K | Bolt hole diameter L | Number of bolt holes n | Bolt Th | C | B | N | H |
| 15 | 1/2 | 21.3 | 95 | 66.7 | 16 | 4 | M14 | 12.7 | 15.5 | 38 | 51 |
| 20 | 3/4 | 26.9 | 115 | 82.6 | 18 | 4 | M16 | 14.3 | 21 | 48 | 56 |
| 25 | 1 | 33.7 | 125 | 88.9 | 18 | 4 | M16 | 15.9 | 27 | 54 | 60 |
| 32 | 1 1/4 | 42.4 | 135 | 98.4 | 18 | 4 | M16 | 17.5 | 35 | 64 | 64 |
| 40 | 1 1/2 | 48.3 | 155 | 114.3 | 22 | 4 | M20 | 19.1 | 41 | 70 | 67 |
| 50 | 2 | 60.3 | 165 | 127 | 18 | 8 | M16 | 20.7 | 52 | 84 | 68 |
| 65 | 2 1/2 | 76.1 | 190 | 149.2 | 22 | 8 | M20 | 23.9 | 66 | 100 | 75 |
| 80 | 3 | 88.9 | 210 | 168.3 | 22 | 8 | M20 | 27 | 77.5 | 117 | 78 |
| 100 | 4 | 114.3 | 255 | 200 | 22 | 8 | M20 | 30.2 | 101.5 | 146 | 84 |
| 125 | 5 | 139.7 | 280 | 235 | 22 | 8 | M20 | 33.4 | 127 | 178 | 97 |
| 150 | 6 | 168.3 | 320 | 269.9 | 22 | 12 | M20 | 35 | 154 | 206 | 97 |
| 200 | 8 | 219.1 | 380 | 330.2 | 26 | 12 | M24 | 39.7 | 203 | 260 | 110 |
| 250 | 10 | 273 | 445 | 387.4 | 30 | 16 | M27 | 46.1 | 255 | 321 | 116 |
| 300 | 12 | 323.9 | 520 | 450.8 | 33 | 16 | M30 | 49.3 | 303.5 | 375 | 129 |
| 350 | 14 | 355.6 | 585 | 514.4 | 33 | 20 | M30 | 52.4 | – | 425 | 141 |
| 400 | 16 | 406.4 | 650 | 571.5 | 36 | 20 | M33 | 55.6 | – | 483 | 144 |
| 450 | 18 | 457 | 710 | 628.6 | 36 | 24 | M33 | 58.8 | – | 533 | 157 |
| 500 | 20 | 508 | 775 | 685.8 | 36 | 24 | M33 | 62 | – | 587 | 160 |
| 600 | 24 | 610 | 915 | 812.8 | 42 | 24 | M39X3 | 68.3 | – | 702 | 167 |
### ASME b16.5 Lap Joint Flange Dimensions
Class 150
Class 300
Class 600
Class 150
| Nominal size | Steel Pipe outer diameter | Flange outer diameter | Connection size | flange thickness | Flange inner diameter | Flange neck big end | Flange height | Rounded comers | Butt welding ring | Theotical weight | | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| DN | NPS | A | D | Bolt hole center circle diameter K | Bolt hole diameter L | Bolt hole quantity n(pieces) | C | B | N | H | R1 | high H | outer diameter d | Kg | | |
| 15 | 1/2 | 21.3 | 90 | 88.9 | 60.3 | 16 | 15.7 | 4 | 11.2 | 22.9 | 30 | 16 | 3 | 51 | 34.9 | 0.38 |
| 20 | 3/4 | 26.9 | 100 | 98.6 | 69.9 | 16 | 15.7 | 4 | 12.7 | 28.2 | 38 | 16 | 3 | 51 | 42.9 | 0.55 |
| 25 | 1 | 33.7 | 110 | 108 | 79.4 | 16 | 15.7 | 4 | 14.3 | 34.9 | 49 | 17 | 3 | 51 | 50.8 | 0.76 |
| 32 | 1 1/4 | 42.4 | 115 | 117.3 | 88.9 | 16 | 15.7 | 4 | 15.9 | 43.7 | 59 | 21 | 5 | 51 | 63.5 | 1.01 |
| 40 | 1 1/2 | 48.3 | 125 | 127 | 98.4 | 16 | 15.7 | 4 | 17.5 | 50.0 | 65 | 22 | 6 | 51 | 73.0 | 1.3 |
| 50 | 2 | 60.3 | 150 | 152.4 | 120.7 | 18 | 19.1 | 4 | 19.1 | 62.5 | 78 | 25 | 8 | 64 | 92.1 | 2.03 |
| 65 | 2 1/2 | 76.1 | 180 | 177.8 | 139.7 | 18 | 19.1 | 4 | 22.3 | 78.5/75.4 | 90 | 29 | 8 | 64 | 104.8 | 3.25 |
| 80 | 3 | 88.9 | 190 | 190.5 | 152.4 | 18 | 19.1 | 4 | 23.9 | 91.4 | 108 | 30 | 10 | 64 | 127.0 | 3.81 |
| 100 | 4 | 114.3 | 230 | 228.6 | 190.5 | 18 | 19.1 | 8 | 23.9 | 116.8 | 135 | 33 | 11 | 76 | 157.2 | 5.25 |
| 125 | 5 | 139.7 | 255 | 254 | 215.9 | 22 | 22.4 | 8 | 23.9 | 144.4 | 164 | 36 | 11 | 76 | 185.7 | 6.02 |
| 150 | 6 | 168.3 | 280 | 278.4 | 241.3 | 22 | 22.4 | 8 | 25.4 | 171.4 | 192 | 40 | 13 | 89 | 215.9 | 7.4 |
| 200 | 8 | 219.1 | 345 | 342.9 | 298.58 | 22 | 22.4 | 8 | 28.6 | 222.2 | 246 | 44 | 13 | 102 | 269.9 | 12.1 |
| 250 | 10 | 273 | 405 | 406.4 | 362.0 | 26 | 25.4 | 12 | 30.2 | 277.4 | 305 | 49 | 13 | 127 | 323.8 | 16.4 |
| 300 | 12 | 323.9 | 485 | 482.6 | 431.8 | 26 | 25.4 | 12 | 31.8 | 328.2 | 365 | 56 | 13 | 152 | 381.0 | 26.1 |
| 350 | 14 | 355.6 | 535 | 533.4 | 476.2 | 30 | 28.4 | 12 | 35.0 | 360.2 | 400 | 79 | 13 | 152 | 412.8 | 34.5 |
| 400 | 16 | 406.4 | 595 | 596.9 | 539.8 | 30 | 28.4 | 16 | 36.6 | 411.2 | 457 | 87 | 13 | 152 | 469.9 | 44.6 |
| 450 | 18 | 457 | 635 | 635 | 577.9 | 33 | 31.75 | 16 | 39.7 | 462.3 | 505 | 97 | 13 | 152 | 533.4 | 48.7 |
| 500 | 20 | 508 | 700 | 698.5 | 635.0 | 33 | 31.75 | 20 | 42.9 | 514.4 | 559 | 103 | 13 | 152 | 584.2 | 61.6 |
| 600 | 24 | 610 | 815 | 812.8 | 749.3 | 36 | 35.1 | 20 | 47.7 | 616.0 | 663 | 111 | 13 | 152 | 692.2 | 86.6 |
Class 300
| Nominal size | Steel Pipe outer diameter | Flange outer diameter | Connection size | flange thickness | Flange inner diameter | Flange neck big end | Flange height | Rounded corners | Butt welding ring | Theotical weight | | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| DN | NPS | A | D | Bolt hole center circle diameter K | Bolt hole diameter L | Bolt hole quantity n(pieces) | C | B | N | H | R1 | high H | outer diameter d | Kg | | |
| 15 | 1/2 | 21.3 | 95 | 88.9 | 66.7 | 16 | 15.7 | 4 | 14.3 | 22.9 | 38 | 22 | 3 | 51 | 34.9 | 0.62 |
| 20 | 3/4 | 26.9 | 115 | 98.6 | 82.6 | 18 | 15.7 | 4 | 15.9 | 28.2 | 48 | 25 | 3 | 51 | 42.9 | 1.1 |
| 25 | 1 | 33.7 | 125 | 108 | 88.9 | 18 | 15.7 | 4 | 17.5 | 34.9 | 54 | 27 | 3 | 51 | 50.8 | 1.33 |
| 32 | 1 1/4 | 42.4 | 135 | 117.3 | 98.4 | 18 | 15.7 | 4 | 19.1 | 43.7 | 64 | 27 | 5 | 51 | 63.5 | 1.65 |
| 40 | 1 1/2 | 48.3 | 155 | 127 | 114.3 | 22 | 15.7 | 4 | 20.7 | 50.0 | 70 | 30 | 6 | 51 | 73.0 | 2.44 |
| 50 | 2 | 60.3 | 165 | 152.4 | 127.0 | 18 | 19.1 | 8 | 22.3 | 62.5 | 84 | 33 | 8 | 64 | 92.1 | 2.83 |
| 65 | 2 1/2 | 76.1 | 190 | 177.8 | 149.2 | 22 | 19.1 | 8 | 25.4 | 78.5/75.4 | 100 | 38 | 8 | 64 | 104.8 | 4.25 |
| 80 | 3 | 88.9 | 210 | 190.5 | 168.3 | 22 | 19.1 | 8 | 28.6 | 91.4 | 117 | 43 | 10 | 64 | 127.0 | 5.78 |
| 100 | 4 | 114.3 | 255 | 228.6 | 200.0 | 22 | 19.1 | 8 | 31.8 | 116.8 | 146 | 48 | 11 | 76 | 157.2 | 9.55 |
| 125 | 5 | 139.7 | 280 | 254 | 235.0 | 22 | 22.4 | 8 | 35.0 | 144.4 | 178 | 51 | 11 | 76 | 185.7 | 12.2 |
| 150 | 6 | 168.3 | 320 | 279.4 | 269.9 | 22 | 22.4 | 12 | 36.6 | 171.4 | 206 | 52 | 13 | 89 | 215.9 | 15.5 |
| 200 | 8 | 219.1 | 380 | 342.9 | 330.2 | 26 | 22.4 | 12 | 41.3 | 222.2 | 260 | 62 | 13 | 102 | 269.9 | 24.1 |
| 250 | 10 | 273 | 445 | 406.4 | 387.4 | 30 | 25.4 | 16 | 47.7 | 277.1 | 321 | 95 | 13 | 254 | 323.8 | 34.4 |
| 300 | 12 | 323.9 | 520 | 482.6 | 450.8 | 33 | 25.4 | 16 | 50.8 | 328.2 | 375 | 102 | 13 | 254 | 381.0 | 50.4 |
| 350 | 14 | 355.6 | 585 | 533.4 | 514.4 | 33 | 28.4 | 20 | 54.0 | 360.2 | 425 | 111 | 13 | 305 | 412.8 | 70.9 |
| 400 | 16 | 406.4 | 650 | 596.9 | 571.5 | 36 | 28.4 | 20 | 57.2 | 411.2 | 483 | 121 | 13 | 305 | 469.9 | 89.5 |
| 450 | 18 | 457 | 710 | 635 | 628.6 | 36 | 31.75 | 24 | 60.4 | 462.3 | 533 | 130 | 13 | 305 | 533.4 | 111 |
| 500 | 20 | 508 | 775 | 698.5 | 685.8 | 36 | 31.75 | 24 | 63.5 | 514.4 | 587 | 140 | 13 | 305 | 584.2 | 137 |
| 600 | 24 | 610 | 915 | 812.8 | 812.8 | 42 | 35.1 | 24 | 69.9 | 616.0 | 702 | 152 | 13 | 305 | 692.2 | 204 |
Class 600
| Nominal size | Steel Pipe outer diameter | Flange outer diameter | Connection size | flange thickness | Flange inner diameter | Flange neck big end | Flange height | Rounded corners | Butt welding ring | Theotical weight | | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| DN | NPS | A | D | Bolt hole center circle diameter K | Bolt hole diameter L | Bolt hole quantity n(pieces) | C | B | N | H | R1 | high H | outer diameter d | Kg | | |
| 15 | 1/2 | 21.3 | 95 | 88.9 | 66.7 | 16 | 15.7 | 4 | 14.3 | 22.9 | 38 | 22 | 3 | 76 | 34.9 | 0.72 |
| 20 | 3/4 | 26.9 | 115 | 98.6 | 82.6 | 18 | 15.7 | 4 | 15.9 | 28.2 | 48 | 25 | 3 | 76 | 42.9 | 1.25 |
| 25 | 1 | 33.7 | 125 | 108 | 88.9 | 18 | 15.7 | 4 | 17.5 | 34.9 | 54 | 27 | 3 | 102 | 50.8 | 1.5 |
| 32 | 11/4 | 42.4 | 135 | 117.3 | 98.4 | 18 | 15.7 | 4 | 20.7 | 43.7 | 64 | 29 | 5 | 102 | 63.5 | 2 |
| 40 | 11/2 | 48.3 | 155 | 127 | 114.3 | 22 | 15.7 | 4 | 22.3 | 50.0 | 70 | 32 | 6 | 102 | 73.0 | 2.92 |
| 50 | 2 | 60.3 | 165 | 152.4 | 127.0 | 18 | 19.1 | 8 | 25.4 | 62.5 | 84 | 37 | 8 | 152 | 92.1 | 3.55 |
| 65 | 21/2 | 76.1 | 190 | 177.8 | 149.2 | 22 | 19.1 | 8 | 28.6 | 78.5/75.4 | 100 | 41 | 8 | 152 | 104.8 | 5.23 |
| 80 | 3 | 88.9 | 210 | 190.5 | 168.3 | 22 | 19.1 | 8 | 31.8 | 91.4 | 117 | 46 | 10 | 152 | 127.0 | 6.95 |
| 100 | 4 | 114.3 | 275 | 228.6 | 215.9 | 26 | 19.1 | 8 | 38.1 | 116.8 | 152 | 54 | 11 | 152 | 157.2 | 14.4 |
| 125 | 5 | 139.7 | 330 | 254 | 266.7 | 30 | 22.4 | 8 | 44.5 | 144.4 | 189 | 60 | 11 | 203 | 185.7 | 24.3 |
| 150 | 6 | 168.3 | 355 | 279.4 | 292.1 | 30 | 22.4 | 12 | 47.7 | 171.4 | 222 | 67 | 13 | 203 | 215.9 | 28.5 |
| 200 | 8 | 219.1 | 420 | 342.9 | 349.2 | 33 | 22.4 | 12 | 55.6 | 222.2 | 273 | 76 | 13 | 203 | 269.9 | 43.1 |
| 250 | 10 | 273 | 510 | 406.4 | 431.8 | 36 | 25.4 | 16 | 63.5 | 277.4 | 343 | 111 | 13 | 254 | 323.8 | 70.5 |
| 300 | 12 | 323.9 | 560 | 482.6 | 489.0 | 36 | 25.4 | 20 | 66.7 | 328.2 | 400 | 117 | 13 | 254 | 381.0 | 86.1 |
| 350 | 14 | 355.6 | 605 | 533.4 | 527.0 | 39 | 28.4 | 20 | 69.9 | 360.2 | 432 | 127 | 13 | 305 | 412.8 | 100 |
| 400 | 16 | 406.4 | 685 | 596.9 | 603.2 | 42 | 28.4 | 20 | 76.2 | 411.2 | 495 | 140 | 13 | 305 | 469.9 | 145 |
| 450 | 18 | 457 | 745 | 635 | 654.0 | 45 | 31.75 | 20 | 82.6 | 462.3 | 546 | 152 | 13 | 305 | 533.4 | 177 |
| 500 | 20 | 508 | 815 | 698.5 | 723.9 | 45 | 31.75 | 24 | 88.9 | 514.4 | 610 | 165 | 13 | 305 | 584.2 | 225 |
| 600 | 24 | 610 | 940 | 812.8 | 838.2 | 51 | 35.1 | 24 | 101.6 | 616.0 | 718 | 184 | 13 | 305 | 692.2 | 318 |
### ASME b16.5 Blind Flange Dimensions
Class 150
Class 300
Class 600
Class 900
Class 1500
Class 2500
Class 150
| Nominal size | Connection size | flange thickness | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- |
| DN | NPS | Flange outer diameter D | Central circle diameter K | Bolt hole diameter L | Number of bolt holes n | Bolt Th | C |
| 15 | 1/2 | 90 | 60.3 | 16 | 4 | M14 | 9.6 |
| 20 | 3/4 | 100 | 69.9 | 16 | 4 | M14 | 11.2 |
| 25 | 1 | 110 | 79.4 | 16 | 4 | M14 | 12.7 |
| 32 | 1 1/4 | 115 | 88.9 | 16 | 4 | M14 | 14.3 |
| 40 | 1 1/2 | 125 | 98.4 | 16 | 4 | M14 | 15.9 |
| 50 | 2 | 150 | 120.7 | 18 | 4 | M16 | 17.5 |
| 65 | 2 1/2 | 180 | 139.7 | 18 | 4 | M16 | 20.7 |
| 80 | 3 | 190 | 152.4 | 18 | 4 | M16 | 22.3 |
| 100 | 4 | 230 | 190.5 | 18 | 8 | M16 | 22.3 |
| 125 | 5 | 255 | 215.9 | 22 | 8 | M20 | 22.3 |
| 150 | 6 | 280 | 241.3 | 22 | 8 | M20 | 23.9 |
| 200 | 8 | 345 | 298.58 | 22 | 8 | M20 | 27.0 |
| 250 | 10 | 405 | 362.0 | 26 | 12 | M24 | 28.6 |
| 300 | 12 | 485 | 431.8 | 26 | 12 | M24 | 30.2 |
| 350 | 14 | 535 | 476.3 | 30 | 12 | M27 | 33.4 |
| 400 | 16 | 595 | 539.8 | 30 | 16 | M27 | 35.0 |
| 450 | 18 | 635 | 577.9 | 33 | 16 | M30 | 38.1 |
| 500 | 20 | 700 | 635.0 | 33 | 20 | M30 | 41.3 |
| 600 | 24 | 815 | 749.3 | 36 | 20 | M33 | 46.1 |
Class 300
| Nominal size | Connection size | flange thickness | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- |
| DN | NPS | Flange outer diameter D | Central circle diameter K | Bolt hole diameter L | Number of bolt holes n | Bolt Th | C |
| 15 | 1/2 | 95 | 66.7 | 16 | 4 | M14 | 12.7 |
| 20 | 3/4 | 115 | 82.6 | 18 | 4 | M16 | 14.3 |
| 25 | 1 | 125 | 88.9 | 18 | 4 | M16 | 15.9 |
| 32 | 1 1/4 | 135 | 98.4 | 18 | 4 | M16 | 17.5 |
| 40 | 1 1/2 | 155 | 114.3 | 22 | 4 | M20 | 19.1 |
| 50 | 2 | 165 | 127.0 | 18 | 8 | M16 | 20.7 |
| 65 | 2 1/2 | 190 | 149.2 | 22 | 8 | M20 | 23.9 |
| 80 | 3 | 210 | 168.3 | 22 | 8 | M20 | 27.0 |
| 100 | 4 | 255 | 200.0 | 22 | 8 | M20 | 30.2 |
| 125 | 5 | 280 | 235.0 | 22 | 8 | M20 | 33.4 |
| 150 | 6 | 320 | 269.9 | 22 | 12 | M20 | 35.0 |
| 200 | 8 | 380 | 330.2 | 26 | 12 | M24 | 39.7 |
| 250 | 10 | 445 | 387.4 | 30 | 16 | M27 | 46.1 |
| 300 | 12 | 520 | 450.8 | 33 | 16 | M30 | 49.3 |
| 350 | 14 | 585 | 514.4 | 33 | 20 | M30 | 52.4 |
| 400 | 16 | 650 | 571.5 | 36 | 20 | M33 | 55.6 |
| 450 | 18 | 710 | 628.6 | 36 | 24 | M33 | 58.8 |
| 500 | 20 | 775 | 685.8 | 36 | 24 | M33 | 62.0 |
| 600 | 24 | 915 | 812.8 | 42 | 24 | M39X3 | 68.3 |
Class 600
| Nominal size | Connection size | flange thickness | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- |
| DN | NPS | Flange outer diameter D | Central circle diameter K | Bolt hole diameter L | Number of bolt holes n | Bolt Th | C |
| 15 | 1/2 | 95 | 66.7 | 16 | 4 | M14 | 14.3 |
| 20 | 3/4 | 115 | 82.6 | 18 | 4 | M16 | 15.9 |
| 25 | 1 | 125 | 88.9 | 18 | 4 | M16 | 17.5 |
| 32 | 1 1/4 | 135 | 98.4 | 18 | 4 | M16 | 20.7 |
| 40 | 1 1/2 | 155 | 114.3 | 22 | 4 | M20 | 22.3 |
| 50 | 2 | 165 | 127.0 | 18 | 8 | M16 | 25.4 |
| 65 | 2 1/2 | 190 | 149.2 | 22 | 8 | M20 | 28.6 |
| 80 | 3 | 210 | 168.3 | 22 | 8 | M20 | 31.8 |
| 100 | 4 | 275 | 215.9 | 26 | 8 | M24 | 38.1 |
| 125 | 5 | 330 | 266.7 | 30 | 8 | M27 | 44.5 |
| 150 | 6 | 355 | 292.1 | 30 | 12 | M27 | 47.7 |
| 200 | 8 | 420 | 349.2 | 33 | 12 | M30 | 55.6 |
| 250 | 10 | 510 | 431.8 | 36 | 16 | M33 | 63.5 |
| 300 | 12 | 560 | 489.0 | 36 | 20 | M33 | 66.7 |
| 350 | 14 | 605 | 527.0 | 39 | 20 | M36X3 | 69.9 |
| 400 | 16 | 685 | 603.2 | 42 | 20 | M39X3 | 76.2 |
| 450 | 18 | 745 | 654.0 | 45 | 20 | M42X3 | 82.6 |
| 500 | 20 | 815 | 723.9 | 45 | 24 | M42X3 | 88.9 |
| 600 | 24 | 940 | 838.2 | 51 | 24 | M48X3 | 101.6 |
Class 900
| Nominal size | Connection size | flange thickness | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- |
| DN | NPS | Flange outer diameter D | Central circle diameter K | Bolt hole diameter L | Number of bolt holes n | Bolt Th | C |
| 15 | 1/2 | 120 | 82.6 | 22 | 4 | M20 | 22.3 |
| 20 | 3/4 | 130 | 88.9 | 22 | 4 | M20 | 25.4 |
| 25 | 1 | 150 | 101.6 | 26 | 4 | M24 | 28.6 |
| 32 | 1 1/4 | 160 | 111.1 | 26 | 4 | M24 | 28.6 |
| 40 | 1 1/2 | 180 | 123.8 | 30 | 4 | M27 | 31.8 |
| 50 | 2 | 215 | 165.1 | 26 | 8 | M24 | 38.1 |
| 65 | 2 1/2 | 245 | 190.5 | 30 | 8 | M27 | 41.3 |
| 80 | 3 | 265 | 203.2 | 33 | 8 | M30 | 47.7 |
| 100 | 4 | 310 | 241.3 | 36 | 8 | M33 | 54.0 |
| 125 | 5 | 375 | 292.1 | 42 | 8 | M39X3 | 73.1 |
| 150 | 6 | 395 | 317.5 | 39 | 12 | M36X3 | 82.6 |
| 200 | 8 | 485 | 393.7 | 45 | 12 | M42X3 | 92.1 |
| 250 | 10 | 585 | 482.6 | 51 | 12 | M48X3 | 108.0 |
| 300 | 12 | 675 | 571.5 | 55 | 16 | M52X3 | 123.9 |
| 350 | 14 | 750 | 635.0 | 60 | 16 | M56X3 | 133.4 |
| 400 | 16 | 825 | 704.8 | 68 | 16 | M64X3 | 146.1 |
| 450 | 18 | 915 | 774.7 | 74 | 16 | M70X3 | 162.0 |
| 500 | 20 | 985 | 831.8 | 80 | 16 | M76X3 | 177.8 |
| 600 | 24 | 1170 | 990.6 | 94 | 16 | M90X3 | 203.2 |
Class 1500
| Nominal size | Connection size | flange thickness | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- |
| DN | NPS | Flange outer diameter D | Central circle diameter K | Bolt hole diameter L | Number of bolt holes n | Bolt Th | C |
| 15 | 1/2 | 120 | 82.6 | 22 | 4 | M20 | 22.3 |
| 20 | 3/4 | 130 | 88.9 | 22 | 4 | M20 | 25.4 |
| 25 | 1 | 150 | 101.6 | 26 | 4 | M24 | 28.6 |
| 32 | 1 1/4 | 160 | 111.1 | 26 | 4 | M24 | 28.6 |
| 40 | 1 1/2 | 180 | 123.8 | 30 | 4 | M27 | 31.8 |
| 50 | 2 | 215 | 165.1 | 26 | 8 | M24 | 38.1 |
| 65 | 2 1/2 | 245 | 190.5 | 30 | 8 | M27 | 41.3 |
| 80 | 3 | 240 | 190.5 | 26 | 8 | M24 | 38.1 |
| 100 | 4 | 290 | 235.0 | 33 | 8 | M30 | 44.5 |
| 125 | 5 | 350 | 279.4 | 36 | 8 | M33 | 50.8 |
| 150 | 6 | 380 | 317.5 | 33 | 12 | M30 | 55.6 |
| 200 | 8 | 470 | 393.7 | 39 | 12 | M36X3 | 63.5 |
| 250 | 10 | 545 | 469.9 | 39 | 16 | M36X3 | 69.9 |
| 300 | 12 | 610 | 533.4 | 39 | 20 | M36X3 | 79.4 |
| 350 | 14 | 640 | 558.8 | 42 | 20 | M39X3 | 85.8 |
| 400 | 16 | 705 | 616.0 | 45 | 20 | M42X3 | 88.9 |
| 450 | 18 | 785 | 685.8 | 51 | 20 | M48X3 | 101.6 |
| 500 | 20 | 855 | 749.3 | 55 | 20 | M52X3 | 108.0 |
| 600 | 24 | 1040 | 901.7 | 68 | 20 | M64X3 | 139.7 |
Class 2500
| Nominal size | Connection size | flange thickness | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- |
| DN | NPS | Flange outer diameter D | Central circle diameter K | Bolt hole diameter L | Number of bolt holes n | Bolt Th | C |
| 15 | 1/2 | 135 | 88.9 | 22 | 4 | M20 | 30.2 |
| 20 | 3/4 | 140 | 95.2 | 22 | 4 | M20 | 31.8 |
| 25 | 1 | 160 | 108.0 | 26 | 4 | M24 | 35.0 |
| 32 | 1 1/4 | 185 | 130.2 | 30 | 4 | M27 | 38.1 |
| 40 | 1 1/2 | 205 | 146.0 | 33 | 4 | M30 | 44.5 |
| 50 | 2 | 235 | 171.4 | 30 | 8 | M27 | 50.9 |
| 65 | 2 1/2 | 265 | 196.8 | 33 | 8 | M30 | 57.2 |
| 80 | 3 | 305 | 228.6 | 36 | 8 | M33 | 66.7 |
| 100 | 4 | 355 | 273.0 | 42 | 8 | M39X3 | 76.2 |
| 125 | 5 | 420 | 323.8 | 48 | 8 | M45X3 | 92.1 |
| 150 | 6 | 485 | 368.3 | 55 | 8 | M52X3 | 108.0 |
| 200 | 8 | 550 | 438.2 | 55 | 12 | M52X3 | 127.0 |
| 250 | 10 | 675 | 539.8 | 68 | 12 | M64X3 | 165.1 |
| 300 | 12 | 760 | 619.1 | 74 | 12 | M70X3 | 184.2 |
NEED HELP? Speek to specialist to find the flange for you
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](#form)
## What is ASME B16.5 Flange?
ASME B16.5 is a critical standard that specifies requirements for pipe flanges and flanged fittings.
It covers sizes from NPS 1/2 through NPS 24 for pressure classes 150 to 1500, and up to NPS 12 for class 2500. The standard details pressure-temperature ratings, material specifications, dimensions, tolerances, and marking requirements.
It applies to components made from cast or forged materials and includes specifications for flange types like slip-on, threaded, and weld neck flanges.
This standardization ensures consistency across industries, facilitates proper component selection, and maintains safety in piping systems.
[ Product List
](https://longanflange.com/wp-content/uploads/2024/10/38821c5b46531428e47c.pdf)
## [KEY FEATURES OF ASME B16.5 FLANGE](https://longanflange.com/product_cat/pressure-vessel-flange-series/)
### Pressure Ratings
ASME B16.5 flanges are classified into pressure classes (150#, 300#, 600#, 900#, 1500#, 2500#) with corresponding temperature ratings. This ASME B16.5 standard defines maximum allowable working pressures at various temperatures for different flange materials.
Material Class
ASME B16.5 groups flange materials into categories (such as Group 1.1, 1.2, etc.) based on their chemical composition and mechanical properties. This standardization ensures proper material selection for specific operating conditions.
Dimensional Standards
The ASME B16.5 specification provides precise dimensional requirements for flange face-to-face length, thickness, bolt hole size and positioning, raised face height, and overall diameter, ensuring universal interchangeability.
Flange Face Types
ASME B16.5 flanges feature various face types including raised face (RF), flat face (FF), ring-type joint (RTJ), and large/small tongue-and-groove, accommodating different sealing requirements and applications.
Size Range Coverage
ASME B16.5 standard covers flange sizes from NPS 1/2 through NPS 24 inches, making it the most widely used specification for small to medium-sized pipe flanges in industrial applications.
Surface Finishing
ASME B16.5 specifies surface finish requirements for different flange faces, particularly for raised face flanges, ensuring proper gasket seating and leak-tight connections under various service conditions.
## ASME B16.5 FLANGE DIMENSIONS
[Slip On Flange](#slipondimension)
[Weld Neck Flange](#weldneckdimension)
[Socket Weld Flange](#socketwelddimension)
[Threaded Flange](#threadeddimension)
[Lap Joint Flange](#lapjointdimension)
[Blind Flange](#blinddimension)
Ask for ASME Flange at your BEST PRICE!
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](#form)
Quels sont les différents types de brides ASME ?
Les types de brides ASME les plus courants comprennent les brides à emboîter, les brides à collerette soudée, les brides à emboîtement soudé, les brides borgnes, les brides à recouvrement et les brides filetées. Chaque type a des applications et des méthodes d'installation spécifiques.
Qu'est-ce que la norme ASME B16.5 ?
La norme ASME B16.5 spécifie les exigences relatives aux brides de tuyaux et aux raccords à brides, couvrant les tailles NPS de ½" à 24" et les classes de pression de 150 à 2500. Elle détaille les dimensions, les matériaux, les valeurs nominales de pression et de température et les exigences de test.
Comment choisir la bride ASME adaptée à mon application ?
Lors de la sélection d'une bride ASME, tenez compte de facteurs tels que la compatibilité des matériaux, les valeurs nominales de pression et de température, le type de bride (par exemple, à enfiler ou à souder) et les exigences spécifiques de votre système de tuyauterie.
Quels matériaux sont couramment utilisés pour les brides ASME ?
Les brides ASME sont généralement fabriquées à partir de matériaux tels que l'acier au carbone, l'acier inoxydable et l'acier allié. Le choix du matériau dépend de l'application et des conditions environnementales
Qu'indique la classe de pression d'une bride ASME ?
La classe de pression indique la pression maximale admissible pour une bride à une température donnée. Les classes courantes comprennent 150, 300, 600, 900, 1500 et 2500
Les brides ASME sont-elles interchangeables avec d’autres normes ?
Bien que les brides ASME soient conçues pour répondre à des normes spécifiques, elles peuvent ne pas être directement interchangeables avec d'autres types comme les brides ASTM sans vérifier qu'elles répondent aux dimensions et aux pressions nominales nécessaires.
Quelle est l'importance des types de parements de brides ?
Les types de face de bride (comme la face surélevée ou la face plate) affectent la qualité de l'étanchéité de la bride avec les joints et ont un impact sur ses performances dans les applications à haute pression
Comment les brides ASME sont-elles testées pour la qualité ?
Les brides ASME sont soumises à divers tests pour garantir qu'elles répondent aux normes de sécurité et de performance, notamment des tests de pression, une vérification des matériaux et des contrôles dimensionnels
Quelles industries utilisent couramment les brides ASME ?
Les brides ASME sont largement utilisées dans des industries telles que le pétrole et le gaz, le traitement chimique, la production d'électricité, le traitement de l'eau, la transformation des aliments et les applications marines en raison de leur fiabilité et de leur respect des normes de sécurité.
Quelle est la différence entre les brides ANSI et ASME ?
L'ANSI (American National Standards Institute) se concentre sur l'élaboration de normes d'ingénierie tandis que l'ASME (American Society of Mechanical Engineers) se concentre sur les normes relatives aux dispositifs mécaniques. Les deux organisations travaillent ensemble pour garantir des normes d'ingénierie universelles ; cependant, les normes ASME incluent souvent des spécifications plus détaillées liées aux pressions nominales et aux critères de conception