---
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.
Vocês oferecem suporte a flanges personalizadas com desenhos?
Sim, oferecemos suporte à produção OEM com base nos padrões ASME/DIN e seus desenhos CAD/PDF.
Qual é a quantidade mínima do pedido (MOQ)?
Para a maioria dos tipos de flange, a quantidade mínima para pedido começa com 20 peças. Para flanges com furos personalizados, a quantidade mínima para pedido pode variar de acordo com o tamanho.
Quanto tempo demora para receber um orçamento?
Respondemos em até 24 horas. Para projetos personalizados, a análise do desenho pode levar até 48 horas.
Quais padrões você suporta?
Fabricamos de acordo com os padrões ASME B16.5, ASME B16.47 Série A/B, DIN, JIS, GOST, EN1092-1 e TEMA.
Posso obter um relatório de teste antes da entrega?
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
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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)
Ask for ASME Flange at your BEST PRICE!
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](#form)
Quais são os diferentes tipos de flanges ASME?
Os tipos mais comuns de flanges ASME incluem flanges slip-on, flanges weld neck, flanges socket weld, flanges cegos, flanges de junta sobreposta e flanges rosqueados. Cada tipo tem aplicações e métodos de instalação específicos.
O que é ASME B16.5?
ASME B16.5 é uma norma que especifica requisitos para flanges de tubos e conexões flangeadas, abrangendo tamanhos de NPS ½” a 24” e classes de pressão de 150 a 2500. Ela detalha dimensões, materiais, classificações de pressão-temperatura e requisitos de teste.
Como escolher o flange ASME certo para minha aplicação?
Ao selecionar um flange ASME, considere fatores como compatibilidade do material, classificações de pressão e temperatura, tipo de flange (por exemplo, slip-on ou pescoço soldado) e os requisitos específicos do seu sistema de tubulação.
Quais materiais são comumente usados para flanges ASME?
Os flanges ASME são normalmente feitos de materiais como aço carbono, aço inoxidável e aço de liga. A escolha do material depende da aplicação e das condições ambientais
O que a classificação de classe de pressão de um flange ASME indica?
A classificação da classe de pressão indica a pressão máxima permitida para um flange em uma determinada temperatura. As classes comuns incluem 150, 300, 600, 900, 1500 e 2500
Os flanges ASME são intercambiáveis com outros padrões?
Embora os flanges ASME sejam projetados para atender a padrões específicos, eles podem não ser diretamente intercambiáveis com outros tipos, como flanges ASTM, sem verificar se atendem às classificações dimensionais e de pressão necessárias
Qual é a importância dos tipos de revestimento de flange?
Os tipos de revestimento de flange (como face elevada ou face plana) afetam a qualidade da vedação do flange com juntas e impactam seu desempenho em aplicações de alta pressão
Como os flanges ASME são testados quanto à qualidade?
Os flanges ASME passam por vários testes para garantir que atendem aos padrões de segurança e desempenho, incluindo testes de pressão, verificação de material e verificações dimensionais
Quais indústrias normalmente usam flanges ASME?
Os flanges ASME são amplamente utilizados em indústrias como petróleo e gás, processamento químico, geração de energia, tratamento de água, processamento de alimentos e aplicações marítimas devido à sua confiabilidade e adesão aos padrões de segurança
Qual é a diferença entre flanges ANSI e ASME?
ANSI (American National Standards Institute) foca em estabelecer padrões de engenharia enquanto ASME (American Society of Mechanical Engineers) foca em padrões de dispositivos mecânicos. Ambas as organizações trabalham juntas para garantir padrões universais de engenharia; no entanto, os padrões ASME frequentemente incluem especificações mais detalhadas relacionadas a classificações de pressão e critérios de projeto