---
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.
Do you support custom flanges with drawings?
Yes, we support OEM production based on ASME/DIN standards and your CAD/PDF drawings.
What is the minimum order quantity (MOQ)?
For most flange types, MOQ starts from 20 pieces. For custom bored flanges, MOQ may vary by size.
How long does it take to receive a quote?
We reply within 24 hours. For custom projects, drawing review may take up to 48 hours.
Which standards do you support?
We manufacture to ASME B16.5, ASME B16.47 Series A/B, DIN, JIS, GOST, EN1092-1, and TEMA standards.
Can I get a test report before delivery?
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 |
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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
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## [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)
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What are the different types of ASME flanges?
The most common types of ASME flanges include slip-on flanges, weld neck flanges, socket weld flanges, blind flanges, lap joint flanges, and threaded flanges. Each type has specific applications and installation methods.
What is ASME B16.5?
ASME B16.5 is a standard that specifies requirements for pipe flanges and flanged fittings, covering sizes from NPS ½” to 24” and pressure classes from 150 to 2500. It details dimensions, materials, pressure-temperature ratings, and testing requirements.
How do I choose the right ASME flange for my application?
When selecting an ASME flange, consider factors such as material compatibility, pressure-temperature ratings, flange type (e.g., slip-on or weld neck), and the specific requirements of your piping system.
What materials are commonly used for ASME flanges?
ASME flanges are typically made from materials such as carbon steel, stainless steel, and alloy steel. The choice of material depends on the application and environmental conditions
What does the pressure class rating of an ASME flange indicate?
The pressure class rating indicates the maximum allowable pressure for a flange at a given temperature. Common classes include 150, 300, 600, 900, 1500, and 2500
Are ASME flanges interchangeable with other standards?
While ASME flanges are designed to meet specific standards, they may not be directly interchangeable with other types like ASTM flanges without verifying that they meet necessary dimensional and pressure ratings
What is the significance of flange facing types?
Flange facing types (such as raised face or flat face) affect how well the flange seals with gaskets and impacts its performance in high-pressure applications
How are ASME flanges tested for quality?
ASME flanges undergo various tests to ensure they meet safety and performance standards, including pressure testing, material verification, and dimensional checks
What industries commonly use ASME flanges?
ASME flanges are widely used in industries such as oil and gas, chemical processing, power generation, water treatment, food processing, and marine applications due to their reliability and adherence to safety standards
What is the difference between ANSI and ASME flanges?
ANSI (American National Standards Institute) focuses on establishing engineering standards while ASME (American Society of Mechanical Engineers) focuses on mechanical device standards. Both organizations work together to ensure universal engineering standards; however, ASME standards often include more detailed specifications related to pressure ratings and design criteria