---
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.
Bạn có hỗ trợ mặt bích tùy chỉnh có bản vẽ không?
Có, chúng tôi hỗ trợ sản xuất OEM dựa trên tiêu chuẩn ASME/DIN và bản vẽ CAD/PDF của bạn.
Số lượng đặt hàng tối thiểu (MOQ) là bao nhiêu?
Đối với hầu hết các loại mặt bích, MOQ bắt đầu từ 20 chiếc. Đối với mặt bích khoan tùy chỉnh, MOQ có thể thay đổi theo kích thước.
Phải mất bao lâu để nhận được báo giá?
Chúng tôi trả lời trong vòng 24 giờ. Đối với các dự án tùy chỉnh, việc xem xét bản vẽ có thể mất tới 48 giờ.
Bạn hỗ trợ những tiêu chuẩn nào?
Chúng tôi sản xuất theo tiêu chuẩn ASME B16.5, ASME B16.47 Series A/B, DIN, JIS, GOST, EN1092-1 và TEMA.
Tôi có thể nhận được báo cáo thử nghiệm trước khi giao hàng không?
Yes, we provide PMI reports, dimension inspections, and hydro-pressure test records for each batch.
## CHOOSE YOUR FLANGE PRESSURE CLASS BELOW
### ASME b16.5 Slip On Flange Dimensions
Class 150
Class 300
Class 600
Class 900
Class 1500
Class 150
| Nominal size | Steel Pipe outer diameter | Connection size | flange thickness | flange inner diameter | flange neck big end | flange height | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| DN | NPS | A | Flange outer diameter D | Central circle diameter K | Bolt hole diameter L | Number of bolt holes n | Bolt Th | C | B | N | H |
| 15 | 1/2 | 21.3 | 90 | 60.3 | 16 | 4 | M14 | 9.6 | 22.5 | 30 | 14 |
| 20 | 3/4 | 26.9 | 100 | 69.9 | 16 | 4 | M14 | 11.2 | 27.5 | 38 | 14 |
| 25 | 1 | 33.7 | 110 | 79.4 | 16 | 4 | M14 | 12.7 | 34.5 | 49 | 16 |
| 32 | 1 1/4 | 42.4 | 115 | 88.9 | 16 | 4 | M14 | 14.3 | 43.5 | 59 | 19 |
| 40 | 1 1/2 | 48.3 | 125 | 98.4 | 16 | 4 | M14 | 15.9 | 49.5 | 65 | 21 |
| 50 | 2 | 60.3 | 150 | 120.7 | 18 | 4 | M16 | 17.5 | 61.5 | 78 | 24 |
| 65 | 2 1/2 | 76.1 | 180 | 139.7 | 18 | 4 | M16 | 20.7 | 77.6 | 90 | 27 |
| 80 | 3 | 88.9 | 190 | 152.4 | 18 | 4 | M16 | 22.3 | 90.5 | 108 | 29 |
| 100 | 4 | 114.3 | 230 | 190.5 | 18 | 8 | M16 | 22.3 | 116.0 | 135 | 32 |
| 125 | 5 | 139.7 | 255 | 215.9 | 22 | 8 | M20 | 22.3 | 143.5 | 164 | 35 |
| 150 | 6 | 168.3 | 280 | 241.3 | 22 | 8 | M20 | 23.9 | 170.5 | 192 | 38 |
| 200 | 8 | 219.1 | 345 | 298.5 | 22 | 8 | M20 | 27.0 | 221.5 | 246 | 43 |
| 250 | 10 | 273.0 | 405 | 362 | 26 | 12 | M24 | 28.6 | 276.5 | 305 | 48 |
| 300 | 12 | 323.9 | 485 | 431.8 | 26 | 12 | M24 | 30.2 | 328.0 | 365 | 54 |
| 350 | 14 | 355.6 | 535 | 476.3 | 30 | 12 | M27 | 33.4 | 360.0 | 400 | 56 |
| 400 | 16 | 406.4 | 595 | 539.8 | 30 | 16 | M27 | 35.0 | 411.0 | 457 | 62 |
| 450 | 18 | 457 | 635 | 577.9 | 33 | 16 | M30 | 38.1 | 462.0 | 505 | 67 |
| 500 | 20 | 508 | 700 | 635 | 33 | 20 | M30 | 41.3 | 513.5 | 559 | 71 |
| 600 | 24 | 610 | 815 | 749.3 | 36 | 20 | M33 | 46.1 | 616.5 | 663 | 81 |
Class 300
| Nominal size | Steel Pipe outer diameter | Connection size | flange thickness | flange inner diameter | flange neck big end | flange height | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| DN | NPS | A | Flange outer diameter D | Central circle diameter K | Bolt hole diameter L | Number of bolt holes n | Bolt Th | C | B | N | H |
| 15 | 1/2 | 21.3 | 95 | 66.7 | 16 | 4 | M14 | 12.7 | 22.5 | 38 | 21 |
| 20 | 3/4 | 26.9 | 115 | 82.6 | 18 | 4 | M16 | 14.3 | 27.5 | 48 | 24 |
| 25 | 1 | 33.7 | 125 | 88.9 | 18 | 4 | M16 | 15.9 | 34.5 | 54 | 25 |
| 32 | 1 1/4 | 42.4 | 135 | 98.4 | 18 | 4 | M16 | 17.5 | 43.5 | 64 | 25 |
| 40 | 1 1/2 | 48.3 | 155 | 114.3 | 22 | 4 | M20 | 19.1 | 49.5 | 70 | 29 |
| 50 | 2 | 60.3 | 165 | 127 | 18 | 8 | M16 | 20.7 | 61.5 | 84 | 32 |
| 65 | 2 1/2 | 76.1 | 190 | 149.2 | 22 | 8 | M20 | 23.9 | 77.6 | 100 | 37 |
| 80 | 3 | 88.9 | 210 | 168.3 | 22 | 8 | M20 | 27 | 90.5 | 117 | 41 |
| 100 | 4 | 114.3 | 255 | 200 | 22 | 8 | M20 | 30.2 | 116 | 146 | 46 |
| 125 | 5 | 139.7 | 280 | 235 | 22 | 8 | M20 | 33.4 | 143.5 | 178 | 49 |
| 150 | 6 | 168.3 | 320 | 269.9 | 22 | 12 | M20 | 35 | 170.5 | 206 | 51 |
| 200 | 8 | 219.1 | 380 | 330.2 | 26 | 12 | M24 | 39.7 | 221.5 | 260 | 60 |
| 250 | 10 | 273 | 445 | 387.4 | 30 | 16 | M27 | 46.1 | 276.5 | 321 | 65 |
| 300 | 12 | 323.9 | 520 | 450.8 | 33 | 16 | M30 | 49.3 | 328 | 375 | 71 |
| 350 | 14 | 355.6 | 585 | 514.4 | 33 | 20 | M30 | 52.4 | 360 | 425 | 75 |
| 400 | 16 | 406.4 | 650 | 571.5 | 36 | 20 | M33 | 55.6 | 411 | 483 | 81 |
| 450 | 18 | 457 | 710 | 628.6 | 36 | 24 | M33 | 58.8 | 462 | 533 | 87 |
| 500 | 20 | 508 | 775 | 685.8 | 36 | 24 | M33 | 62 | 513.5 | 587 | 94 |
| 600 | 24 | 610 | 915 | 812.8 | 42 | 24 | M39X3 | 68.3 | 616.5 | 702 | 105 |
Class 600
| Nominal size | Steel Pipe outer diameter | Connection size | flange thickness | flange inner diameter | flange neck big end | flange height | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| DN | NPS | A | Flange outer diameter D | Central circle diameter K | Bolt hole diameter L | Number of bolt holes n | Bolt Th | C | B | N | H |
| 15 | 1/2 | 21.3 | 95 | 66.7 | 16 | 4 | M14 | 14.3 | 22.5 | 38 | 22 |
| 20 | 3/4 | 26.9 | 115 | 82.6 | 18 | 4 | M16 | 15.9 | 27.5 | 48 | 25 |
| 25 | 1 | 33.7 | 125 | 88.9 | 18 | 4 | M16 | 17.5 | 34.5 | 54 | 27 |
| 32 | 1 1/4 | 42.4 | 135 | 88.4 | 18 | 4 | M16 | 20.7 | 43.5 | 64 | 29 |
| 40 | 1 1/2 | 48.3 | 155 | 114.3 | 22 | 4 | M20 | 22.3 | 49.5 | 70 | 32 |
| 50 | 2 | 60.3 | 165 | 127 | 18 | 8 | M16 | 25.4 | 61.5 | 84 | 37 |
| 65 | 2 1/2 | 76.1 | 190 | 149.2 | 22 | 8 | M20 | 28.6 | 77.6 | 100 | 41 |
| 80 | 3 | 88.9 | 210 | 168.3 | 22 | 8 | M20 | 31.8 | 90.5 | 117 | 46 |
| 100 | 4 | 114.3 | 275 | 215.9 | 26 | 8 | M24 | 38.1 | 116 | 152 | 54 |
| 125 | 5 | 139.7 | 330 | 266.7 | 30 | 8 | M27 | 44.5 | 143.5 | 189 | 60 |
| 150 | 6 | 168.3 | 355 | 292.1 | 30 | 12 | M27 | 47.7 | 170.5 | 222 | 67 |
| 200 | 8 | 219.1 | 420 | 349.2 | 33 | 12 | M30 | 55.6 | 221.5 | 273 | 76 |
| 250 | 10 | 273 | 510 | 431.8 | 36 | 16 | M33 | 63.5 | 276.5 | 343 | 86 |
| 300 | 12 | 323.9 | 560 | 489 | 36 | 20 | M33 | 66.7 | 328 | 400 | 92 |
| 350 | 14 | 355.6 | 605 | 527 | 39 | 20 | M36X3 | 69.9 | 360 | 432 | 94 |
| 400 | 16 | 406.4 | 685 | 603.2 | 42 | 20 | M39X3 | 76.2 | 411 | 495 | 106 |
| 450 | 18 | 457 | 745 | 654 | 45 | 20 | M42X3 | 82.6 | 462 | 546 | 117 |
| 500 | 20 | 508 | 815 | 723.9 | 45 | 24 | M42X3 | 88.9 | 513.5 | 610 | 127 |
| 600 | 24 | 610 | 940 | 838.2 | 51 | 24 | M48X3 | 101.6 | 616.5 | 718 | 140 |
Class 900
| Nominal size | Steel Pipe outer diameter | Connection size | flange thickness | flange inner diameter | flange neck big end | flange height | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| DN | NPS | A | Flange outer diameter D | Central circle diameter K | Bolt hole diameter L | Number of bolt holes n | Bolt Th | C | B | N | H |
| 15 | 1/2 | 21.3 | 120 | 82.6 | 22 | 4 | M20 | 22.3 | 22.5 | 38 | 32 |
| 20 | 3/4 | 26.9 | 130 | 88.9 | 22 | 4 | M20 | 25.4 | 27.5 | 44 | 35 |
| 25 | 1 | 33.7 | 150 | 101.6 | 26 | 4 | M24 | 28.6 | 34.5 | 52 | 41 |
| 32 | 1 1/4 | 42.4 | 160 | 111.1 | 26 | 4 | M24 | 28.6 | 43.5 | 64 | 41 |
| 40 | 1 1/2 | 48.3 | 180 | 123.8 | 30 | 4 | M27 | 31.8 | 49.5 | 70 | 44 |
| 50 | 2 | 60.3 | 215 | 165.1 | 26 | 8 | M24 | 38.1 | 61.5 | 105 | 57 |
| 65 | 2 1/2 | 76.1 | 245 | 190.5 | 30 | 8 | M27 | 41.3 | 77.6 | 124 | 64 |
| 80 | 3 | 88.9 | 240 | 190.5 | 26 | 8 | M24 | 38.1 | 90.5 | 127 | 54 |
| 100 | 4 | 114.3 | 290 | 235 | 33 | 8 | M30 | 44.5 | 116 | 159 | 70 |
| 125 | 5 | 139.7 | 350 | 279.4 | 36 | 8 | M33 | 50.8 | 143.5 | 190 | 79 |
| 150 | 6 | 168.3 | 380 | 317.5 | 33 | 12 | M30 | 55.6 | 170.5 | 235 | 86 |
| 200 | 8 | 219.1 | 470 | 393.7 | 39 | 12 | M36X3 | 63.5 | 221.5 | 298 | 102 |
| 250 | 10 | 273 | 545 | 469.9 | 39 | 16 | M36X3 | 69.9 | 276.5 | 368 | 108 |
| 300 | 12 | 323.9 | 610 | 533.4 | 39 | 20 | M36X3 | 79.4 | 328 | 419 | 117 |
| 350 | 14 | 355.6 | 640 | 558.8 | 42 | 20 | M39X3 | 85.8 | 360 | 451 | 130 |
| 400 | 16 | 406.4 | 705 | 616 | 45 | 20 | M42X3 | 88.9 | 411 | 508 | 133 |
| 450 | 18 | 457 | 785 | 685.8 | 51 | 20 | M48X3 | 101.6 | 462 | 565 | 152 |
| 500 | 20 | 508 | 855 | 749.3 | 55 | 20 | M52X3 | 108 | 513.5 | 622 | 159 |
| 600 | 24 | 610 | 1040 | 901.7 | 68 | 20 | M64X3 | 139.7 | 616.5 | 749 | 203 |
Class 1500
| Nominal size | Steel Pipe outer diameter | Connection size | flange thickness | flange inner diameter | flange neck big end | flange height | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| DN | NPS | A | Flange outer diameter D | Central circle diameter K | Bolt hole diameter L | Number of bolt holes n | Bolt Th | C | B | N | H |
| 15 | 1/2 | 21.3 | 120 | 82.6 | 22 | 4 | M20 | 22.3 | 22.5 | 38 | 32 |
| 20 | 3/4 | 26.9 | 130 | 88.9 | 22 | 4 | M20 | 25.4 | 27.5 | 44 | 35 |
| 25 | 1 | 33.7 | 150 | 101.6 | 26 | 4 | M24 | 28.6 | 34.5 | 52 | 41 |
| 32 | 1 1/4 | 42.4 | 160 | 111.1 | 26 | 4 | M24 | 28.6 | 43.5 | 64 | 41 |
| 40 | 1 1/2 | 48.3 | 180 | 123.8 | 30 | 4 | M27 | 31.8 | 49.5 | 70 | 44 |
| 50 | 2 | 60.3 | 215 | 165.1 | 26 | 8 | M24 | 38.1 | 61.5 | 105 | 57 |
| 65 | 2 1/2 | 76.1 | 245 | 190.5 | 30 | 8 | M27 | 41.3 | 77.6 | 124 | 64 |
### ASME b16.5 Weld Neck Flange Dimensions
Class 150
Class 300
Class 600
Class 900
Class 1500
Class 2500
Class 150
| Nominal size | Steel Pipe outer diameter | Connection size | flange thickness | flange inner diameter | flange neck big end | flange height | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| DN | NPS | A | Flange outer diameter D | Central circle diameter K | Bolt hole diameter L | Number of bolt holes n | Bolt Th | C | B | N | H |
| 15 | 1/2 | 21.3 | 90 | 60.3 | 16 | 4 | M14 | 9.6 | 15.5 | 30 | 46 |
| 20 | 3/4 | 26.9 | 100 | 69.9 | 16 | 4 | M14 | 11.2 | 21 | 38 | 51 |
| 25 | 1 | 33.7 | 110 | 79.4 | 16 | 4 | M14 | 12.7 | 27 | 49 | 54 |
| 32 | 1 1/4 | 42.4 | 115 | 88.9 | 16 | 4 | M14 | 14.3 | 35 | 59 | 56 |
| 40 | 1 1/2 | 48.3 | 125 | 98.4 | 16 | 4 | M14 | 15.9 | 41 | 65 | 60 |
| 50 | 2 | 60.3 | 150 | 120.7 | 18 | 4 | M16 | 17.5 | 52 | 78 | 62 |
| 65 | 2 1/2 | 76.1 | 180 | 139.7 | 18 | 4 | M16 | 20.7 | 66 | 90 | 68 |
| 80 | 3 | 88.9 | 190 | 152.4 | 18 | 4 | M16 | 22.3 | 77.5 | 108 | 68 |
| 100 | 4 | 114.3 | 230 | 190.5 | 18 | 8 | M16 | 22.3 | 101.5 | 135 | 75 |
| 125 | 5 | 139.7 | 255 | 215.9 | 22 | 8 | M20 | 22.3 | 127 | 164 | 87 |
| 150 | 6 | 168.3 | 280 | 241.3 | 22 | 8 | M20 | 23.9 | 154 | 192 | 87 |
| 200 | 8 | 219.1 | 345 | 298.5 | 22 | 8 | M20 | 27 | 203 | 246 | 100 |
| 250 | 10 | 273 | 405 | 362 | 26 | 12 | M24 | 28.6 | 255 | 305 | 100 |
| 300 | 12 | 323.9 | 485 | 431.8 | 26 | 12 | M24 | 30.2 | 303.5 | 365 | 113 |
| 350 | 14 | 355.6 | 535 | 476.3 | 30 | 12 | M27 | 33.4 | – | 400 | 125 |
| 400 | 16 | 406.4 | 595 | 539.8 | 30 | 16 | M27 | 35 | – | 457 | 125 |
| 450 | 18 | 457 | 635 | 577.9 | 33 | 16 | M30 | 38.1 | – | 505 | 138 |
| 500 | 20 | 508 | 700 | 635 | 33 | 20 | M30 | 41.3 | – | 559 | 143 |
| 600 | 24 | 610 | 815 | 749.3 | 36 | 20 | M33 | 46.1 | – | 663 | 151 |
Class 300
| Nominal size | Steel Pipe outer diameter | Connection size | flange thickness | flange inner diameter | flange neck big end | flange height | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| DN | NPS | A | Flange outer diameter D | Central circle diameter K | Bolt hole diameter L | Number of bolt holes n | Bolt Th | C | B | N | H |
| 15 | 1/2 | 21.3 | 95 | 66.7 | 16 | 4 | M14 | 12.7 | 15.5 | 38 | 51 |
| 20 | 3/4 | 26.9 | 115 | 82.6 | 18 | 4 | M16 | 14.3 | 21 | 48 | 56 |
| 25 | 1 | 33.7 | 125 | 88.9 | 18 | 4 | M16 | 15.9 | 27 | 54 | 60 |
| 32 | 1 1/4 | 42.4 | 135 | 98.4 | 18 | 4 | M16 | 17.5 | 35 | 64 | 64 |
| 40 | 1 1/2 | 48.3 | 155 | 114.3 | 22 | 4 | M20 | 19.1 | 41 | 70 | 67 |
| 50 | 2 | 60.3 | 165 | 127 | 18 | 8 | M16 | 20.7 | 52 | 84 | 68 |
| 65 | 2 1/2 | 76.1 | 190 | 149.2 | 22 | 8 | M20 | 23.9 | 66 | 100 | 75 |
| 80 | 3 | 88.9 | 210 | 168.3 | 22 | 8 | M20 | 27 | 77.5 | 117 | 78 |
| 100 | 4 | 114.3 | 255 | 200 | 22 | 8 | M20 | 30.2 | 101.5 | 146 | 84 |
| 125 | 5 | 139.7 | 280 | 235 | 22 | 8 | M20 | 33.4 | 127 | 178 | 97 |
| 150 | 6 | 168.3 | 320 | 269.9 | 22 | 12 | M20 | 35 | 154 | 206 | 97 |
| 200 | 8 | 219.1 | 380 | 330.2 | 26 | 12 | M24 | 39.7 | 203 | 260 | 110 |
| 250 | 10 | 273 | 445 | 387.4 | 30 | 16 | M27 | 46.1 | 255 | 321 | 116 |
| 300 | 12 | 323.9 | 520 | 450.8 | 33 | 16 | M30 | 49.3 | 303.5 | 375 | 129 |
| 350 | 14 | 355.6 | 585 | 514.4 | 33 | 20 | M30 | 52.4 | – | 425 | 141 |
| 400 | 16 | 406.4 | 650 | 571.5 | 36 | 20 | M33 | 55.6 | – | 483 | 144 |
| 450 | 18 | 457 | 710 | 628.6 | 36 | 24 | M33 | 58.8 | – | 533 | 157 |
| 500 | 20 | 508 | 775 | 685.8 | 36 | 24 | M33 | 62 | – | 587 | 160 |
| 600 | 24 | 610 | 915 | 812.8 | 42 | 24 | M39X3 | 68.3 | – | 702 | 167 |
Class 600
| Nominal size | Steel Pipe outer diameter | Connection size | flange thickness | flange inner diameter | flange neck big end | flange height | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| DN | NPS | A | Flange outer diameter D | Central circle diameter K | Bolt hole diameter L | Number of bolt holes n | Bolt Th | C | B | N | H |
| 15 | 1/2 | 21.3 | 95 | 66.7 | 16 | 4 | M14 | 14.3 | – | 38 | 52 |
| 20 | 3/4 | 26.9 | 115 | 82.6 | 18 | 4 | M16 | 15.9 | – | 48 | 57 |
| 25 | 1 | 33.7 | 125 | 88.9 | 18 | 4 | M16 | 17.5 | – | 54 | 62 |
| 32 | 1 1/4 | 42.4 | 135 | 98.4 | 18 | 4 | M16 | 20.7 | – | 64 | 67 |
| 40 | 1 1/2 | 48.3 | 155 | 114.3 | 22 | 4 | M20 | 22.3 | – | 70 | 70 |
| 50 | 2 | 60.3 | 165 | 127 | 18 | 8 | M16 | 25.4 | – | 84 | 73 |
| 65 | 2 1/2 | 76.1 | 190 | 149.2 | 22 | 8 | M20 | 28.6 | – | 100 | 79 |
| 80 | 3 | 88.9 | 210 | 168.3 | 22 | 8 | M20 | 31.8 | – | 117 | 83 |
| 100 | 4 | 114.3 | 275 | 215.9 | 26 | 8 | M24 | 38.1 | – | 152 | 102 |
| 125 | 5 | 139.7 | 330 | 266.7 | 30 | 8 | M27 | 44.5 | – | 189 | 114 |
| 150 | 6 | 168.3 | 355 | 292.1 | 30 | 12 | M27 | 47.7 | – | 222 | 117 |
| 200 | 8 | 219.1 | 420 | 349.2 | 33 | 12 | M30 | 55.6 | – | 273 | 133 |
| 250 | 10 | 273 | 510 | 431.8 | 36 | 16 | M33 | 63.5 | – | 343 | 152 |
| 300 | 12 | 323.9 | 560 | 489 | 36 | 20 | M33 | 66.7 | – | 400 | 156 |
| 350 | 14 | 355.6 | 605 | 527 | 39 | 20 | M36X3 | 69.9 | – | 432 | 165 |
| 400 | 16 | 406.4 | 685 | 603.2 | 42 | 20 | M39X3 | 76.2 | – | 495 | 178 |
| 450 | 18 | 457 | 745 | 654 | 45 | 20 | M42X3 | 82.6 | – | 546 | 184 |
| 500 | 20 | 508 | 815 | 723.9 | 45 | 24 | M42X3 | 88.9 | – | 610 | 190 |
| 600 | 24 | 610 | 940 | 838.2 | 51 | 24 | M48X3 | 101.6 | – | 718 | 203 |
Class 900
| Nominal size | Steel Pipe outer diameter | Connection size | flange thickness | flange inner diameter | flange neck big end | flange height | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| DN | NPS | A | Flange outer diameter D | Central circle diameter K | Bolt hole diameter L | Number of bolt holes n | Bolt Th | C | B | N | H |
| 15 | 1/2 | 21.3 | 120 | 82.6 | 22 | 4 | M20 | 22.3 | – | 38 | 60 |
| 20 | 3/4 | 26.9 | 130 | 88.9 | 22 | 4 | M20 | 25.4 | – | 44 | 70 |
| 25 | 1 | 33.7 | 150 | 101.6 | 26 | 4 | M24 | 28.6 | – | 52 | 73 |
| 32 | 1 1/4 | 42.4 | 160 | 111.1 | 26 | 4 | M24 | 28.6 | – | 64 | 73 |
| 40 | 1 1/2 | 48.3 | 180 | 123.8 | 30 | 4 | M27 | 31.8 | – | 70 | 83 |
| 50 | 2 | 60.3 | 215 | 165.1 | 26 | 8 | M24 | 38.1 | – | 105 | 102 |
| 65 | 2 1/2 | 76.1 | 245 | 190.5 | 30 | 8 | M27 | 41.3 | – | 124 | 105 |
| 80 | 3 | 88.9 | 240 | 190.5 | 26 | 8 | M24 | 38.1 | – | 127 | 102 |
| 100 | 4 | 114.3 | 290 | 235 | 33 | 8 | M30 | 44.5 | – | 159 | 114 |
| 125 | 5 | 139.7 | 350 | 279.4 | 36 | 8 | M33 | 50.8 | – | 190 | 127 |
| 150 | 6 | 168.3 | 380 | 317.5 | 33 | 12 | M30 | 55.6 | – | 235 | 140 |
| 200 | 8 | 219.1 | 470 | 393.7 | 39 | 12 | M36X3 | 63.5 | – | 298 | 162 |
| 250 | 10 | 273 | 545 | 469.9 | 39 | 16 | M36X3 | 69.9 | – | 368 | 184 |
| 300 | 12 | 323.9 | 610 | 533.4 | 39 | 20 | M36X3 | 79.4 | – | 419 | 200 |
| 350 | 14 | 355.6 | 640 | 558.8 | 42 | 20 | M39X3 | 85.8 | – | 451 | 213 |
| 400 | 16 | 406.4 | 705 | 616 | 45 | 20 | M42X3 | 88.9 | – | 508 | 216 |
| 450 | 18 | 457 | 785 | 685.8 | 51 | 20 | M48X3 | 101.6 | – | 565 | 229 |
| 500 | 20 | 508 | 855 | 749.3 | 55 | 20 | M52X3 | 108 | – | 622 | 248 |
| 600 | 24 | 610 | 1040 | 901.7 | 68 | 20 | M64X3 | 139.7 | – | 749 | 292 |
Class 1500
| Nominal size | Steel Pipe outer diameter | Connection size | flange thickness | flange inner diameter | flange neck big end | flange height | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| DN | NPS | A | Flange outer diameter D | Central circle diameter K | Bolt hole diameter L | Number of bolt holes n | Bolt Th | C | B | N | H |
| 15 | 1/2 | 21.3 | 120 | 82.6 | 22 | 4 | M20 | 22.3 | – | 38 | 60 |
| 20 | 3/4 | 26.9 | 130 | 88.9 | 22 | 4 | M20 | 25.4 | – | 44 | 70 |
| 25 | 1 | 33.7 | 150 | 101.6 | 26 | 4 | M24 | 28.6 | – | 52 | 73 |
| 32 | 1 1/4 | 42.4 | 160 | 111.1 | 26 | 4 | M24 | 28.6 | – | 64 | 73 |
| 40 | 1 1/2 | 48.3 | 180 | 123.8 | 30 | 4 | M27 | 31.8 | – | 70 | 83 |
| 50 | 2 | 60.3 | 215 | 165.1 | 26 | 8 | M24 | 38.1 | – | 105 | 102 |
| 65 | 2 1/2 | 76.1 | 245 | 190.5 | 30 | 8 | M27 | 41.3 | – | 124 | 105 |
| 80 | 3 | 88.9 | 265 | 203.2 | 33 | 8 | M30 | 47.7 | – | 133 | 117 |
| 100 | 4 | 114.3 | 310 | 241.3 | 36 | 8 | M33 | 54 | – | 162 | 124 |
| 125 | 5 | 139.7 | 375 | 292.1 | 42 | 8 | M39X3 | 73.1 | – | 197 | 156 |
| 150 | 6 | 168.3 | 395 | 317.5 | 39 | 12 | M36X3 | 82.6 | – | 229 | 171 |
| 200 | 8 | 219.1 | 485 | 393.7 | 45 | 12 | M42X3 | 92.1 | – | 292 | 213 |
| 250 | 10 | 273 | 585 | 482.6 | 51 | 12 | M48X3 | 108 | – | 368 | 254 |
| 300 | 12 | 323.9 | 675 | 571.5 | 55 | 16 | M52X3 | 123.9 | – | 451 | 283 |
| 350 | 14 | 355.6 | 750 | 635 | 60 | 16 | M56X3 | 133.4 | – | 495 | 298 |
| 400 | 16 | 406.4 | 825 | 704.8 | 68 | 16 | M64X3 | 146.1 | – | 552 | 311 |
| 450 | 18 | 457 | 915 | 774.7 | 74 | 16 | M70X3 | 162 | – | 597 | 327 |
| 500 | 20 | 508 | 985 | 831.8 | 80 | 16 | M76X3 | 177.8 | – | 641 | 356 |
| 600 | 24 | 610 | 1170 | 990.6 | 94 | 16 | M90X3 | 203.2 | – | 762 | 406 |
Class 2500
| Nominal size | Steel Pipe outer diameter | Connection size | flange thickness | flange inner diameter | flange neck big end | flange height | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| DN | NPS | A | Flange outer diameter D | Central circle diameter K | Bolt hole diameter L | Number of bolt holes n | Bolt Th | C | B | N | H |
| 15 | 1/2 | 21.3 | 135 | 88.9 | 22 | 4 | M20 | 30.2 | – | 43 | 73 |
| 20 | 3/4 | 26.9 | 140 | 95.2 | 22 | 4 | M20 | 31.8 | – | 51 | 79 |
| 25 | 1 | 33.7 | 160 | 108 | 26 | 4 | M24 | 35 | – | 57 | 89 |
| 32 | 1 1/4 | 42.4 | 185 | 130.2 | 30 | 4 | M27 | 38.1 | – | 73 | 95 |
| 40 | 1 1/2 | 48.3 | 205 | 146 | 33 | 4 | M30 | 44.5 | – | 79 | 111 |
| 50 | 2 | 60.3 | 235 | 171.4 | 30 | 8 | M27 | 50.9 | – | 95 | 127 |
| 65 | 21/2 | 76.1 | 265 | 196.8 | 33 | 8 | M30 | 57.2 | – | 114 | 143 |
| 80 | 3 | 88.9 | 305 | 228.6 | 36 | 8 | M33 | 66.7 | – | 133 | 168 |
| 100 | 4 | 114.3 | 355 | 273 | 42 | 8 | M39X3 | 76.2 | – | 165 | 190 |
| 125 | 5 | 139.7 | 420 | 323.8 | 48 | 8 | M45X3 | 92.1 | – | 203 | 229 |
| 150 | 6 | 168.3 | 485 | 368.3 | 55 | 8 | M52X3 | 108 | – | 235 | 273 |
| 200 | 8 | 219.1 | 550 | 438.2 | 55 | 12 | M52X3 | 127 | – | 305 | 318 |
| 250 | 10 | 273 | 675 | 539.8 | 68 | 12 | M64X3 | 165.1 | – | 375 | 419 |
| 300 | 12 | 323.9 | 760 | 619.1 | 74 | 12 | M70X3 | 184.2 | – | 441 | 464 |
### ASME b16.5 Socket Weld Flange Dimensions
Class 150
Class 300
Class 600
Class 900
Class 150
| Nominal size | Steel pipe outer diameter A | Flange outer diameter D | Connection size | flange thickness C | Flange inner diameter B1 | Socket | Flange neck big end N | Flange height H | Theoretical weight Kg | | | | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| DN | NPS | Bolt hole center circle diameter K | Bold hole diameter L | Bolt hole Quantity n(pieces) | B2 | U | | | | | | | | | | | |
| 15 | 1/2 | 21.3 | 90 | 88.9 | 60.3 | 16 | 15.7 | 4 | 9.6 | 15.5 | 15.7 | 22.5 | 22.4 | 10 | 30 | 14 | 0.42 |
| 20 | 3/4 | 26.9 | 100 | 98.6 | 69.9 | 16 | 15.7 | 4 | 11.2 | 21 | 20.8 | 27.5 | 27.7 | 11 | 38 | 14 | 0.59 |
| 25 | 1 | 33.7 | 110 | 108 | 79.4 | 16 | 15.7 | 4 | 12.7 | 27 | 26.7 | 34.5 | 34.5 | 13 | 49 | 16 | 0.81 |
| 32 | 1 1/4 | 42.4 | 115 | 117.3 | 88.9 | 16 | 15.7 | 4 | 14.3 | 35 | 35.1 | 43.5 | 43.2 | 14 | 59 | 19 | 1.07 |
| 40 | 1 1/2 | 48.3 | 125 | 127 | 98.4 | 16 | 15.7 | 4 | 15.9 | 41 | 40.9 | 49.5 | 49.5 | 16 | 65 | 21 | 1.36 |
| 50 | 2 | 60.3 | 150 | 152.4 | 120.7 | 18 | 19.1 | 4 | 17.5 | 52 | 52.6 | 61.5 | 62 | 17 | 78 | 24 | 2.1 |
| 65 | 2 1/2 | 76.1 | 180 | 177.8 | 139.7 | 18 | 19.1 | 4 | 20.7 | 66 | 62.7 | 77.6 | 74.7 | 19 | 90 | 27 | 3.33 |
| 80 | 3 | 88.9 | 190 | 190.5 | 152.4 | 18 | 19.1 | 4 | 22.3 | 77.5 | 78 | 90.5 | 90.7 | 21 | 108 | 29 | 3.9 |
Note: The inner diameter B1 of the flange is determined by the wall thickness of the steel pipe. The user should indicate it when ordering. The flange inner diameter B1 listed in the table is equivalent to a steel pipe with a wall thickness of Sch40
Class 300
| Nominal size | Steel pipe outer diameter A | Flange outer diameter D | Connection size | flange thickness C | Flange inner diameter B1 | Socket | Flange neck big end N | Flange height H | Theoretical weight Kg | | | | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| DN | NPS | Bolt hole center circle diameter K | Bold hole diameter L | Bolt hole Quantity n(pieces) | B2 | U | | | | | | | | | | | |
| 15 | ½ | 21.3 | 95 | 88.9 | 66.7 | 16 | 15.7 | 4 | 12.7 | 15.5 | 15.7 | 22.5 | 22.4 | 10 | 38 | 21 | 0.66 |
| 20 | ¾ | 26.9 | 115 | 98.6 | 82.6 | 18 | 15.7 | 4 | 14.3 | 21 | 20.8 | 27.5 | 27.7 | 11 | 48 | 24 | 1.15 |
| 25 | 1 | 33.7 | 125 | 108 | 88.9 | 18 | 15.7 | 4 | 15.9 | 27 | 26.7 | 34.5 | 34.5 | 13 | 54 | 25 | 1.4 |
| 32 | 1 ¼ | 42.4 | 135 | 117.3 | 98.4 | 18 | 15.7 | 4 | 17.5 | 35 | 35.1 | 43.5 | 43.2 | 14 | 64 | 25 | 1.75 |
| 40 | 1 ½ | 48.3 | 155 | 127 | 114.3 | 22 | 15.7 | 4 | 19.1 | 41 | 40.9 | 49.5 | 49.5 | 16 | 70 | 29 | 2.55 |
| 50 | 2 | 60.3 | 165 | 152.4 | 127 | 18 | 19.1 | 8 | 20.7 | 52 | 52.6 | 61.5 | 62 | 17 | 84 | 32 | 2.93 |
| 65 | 2 ½ | 76.1 | 190 | 177.8 | 149.2 | 22 | 19.1 | 8 | 23.9 | 66 | 62.7 | 77.6 | 74.7 | 19 | 100 | 37 | 4.4 |
| 80 | 3 | 88.9 | 210 | 190.5 | 168.3 | 22 | 19.1 | 8 | 27 | 77.5 | 78 | 90.5 | 90.7 | 21 | 117 | 41 | 5.92 |
Note: The inner diameter B1 of the flange is determined by the wall thickness of the steel pipe. The user should indicate it when ordering. The flange inner diameter B1 listed in the table is equivalent to a steel pipe with a wall thickness of Sch40
Class 600
| Nominal size | Steel pipe outer diameter A | Flange outer diameter D | Connection size | flange thickness C | Flange inner diameter B1 | Socket | Flange neck big end N | Flange height H | Theoretical weight Kg | | | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| DN | NPS | Bolt hole center circle diameter K | Bold hole diameter L | Bolt hole Quantity n(pieces) | B2 | U | | | | | | | | | | |
| 15 | 1/2 | 21.3 | 95 | 88.9 | 66.7 | 16 | 15.7 | 4 | 14.3 | – | 22.5 | 22.4 | 10 | 38 | 22 | 0.76 |
| 20 | 3/4 | 26.9 | 115 | 98.6 | 82.6 | 18 | 15.7 | 4 | 15.9 | – | 27.5 | 27.7 | 11 | 48 | 25 | 1.29 |
| 25 | 1 | 33.7 | 125 | 108 | 88.9 | 18 | 15.7 | 4 | 17.5 | – | 34.5 | 34.5 | 13 | 54 | 27 | 1.55 |
| 32 | 1 1/4 | 424 | 135 | 117.3 | 98.4 | 18 | 15.7 | 4 | 20.7 | – | 43.5 | 43.2 | 14 | 64 | 29 | 2.06 |
| 40 | 1 1/2 | 48.3 | 155 | 127 | 114.3 | 22 | 15.7 | 4 | 22.3 | – | 49.5 | 49.5 | 16 | 70 | 32 | 3.00 |
| 50 | 2 | 60.3 | 165 | 152.4 | 127 | 18 | 19.1 | 8 | 25.4 | – | 61.5 | 62 | 17 | 84 | 37 | 3.67 |
| 65 | 2 1/2 | 76.1 | 190 | 177.8 | 149.2 | 22 | 19.1 | 8 | 28.6 | – | 77.6 | 74.7 | 19 | 100 | 41 | 5.35 |
| 80 | 3 | 88.9 | 210 | 190.5 | 168.3 | 22 | 19.1 | 8 | 31.8 | – | 90.5 | 90.7 | 21 | 117 | 46 | 7.06 |
Note: The inner diameter B1 of the flange is determined by the wall thickness of the steel pipe. The user should indicate it when ordering. The flange inner diameter B1 listed in the table is equivalent to a steel pipe with a wall thickness of Sch40
Class 900
| Nominal size | Steel pipe outer diameter A | Flange outer diameter D | Connection size | flange thickness C | Flange inner diameter B1 | Socket | Flange neck big end N | Flange height H | Theoretical weight Kg | | | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| DN | NPS | Bolt hole center circle diameter K | Bold hole diameter L | Bolt hole Quantity n(pieces) | B2 | U | | | | | | | | | | |
| 15 | ½ | 21.3 | 120 | 120.6 | 82.6 | 22 | 22.3 | 4 | 22.3 | – | 22.5 | 22.4 | 10 | 38 | 32 | 1.8 |
| 20 | ¾ | 26.9 | 130 | 130 | 88.9 | 22 | 22.3 | 4 | 25.4 | – | 27.5 | 27.7 | 11 | 44 | 35 | 2.41 |
| 25 | 1 | 33.7 | 150 | 149.3 | 101.6 | 26 | 25.4 | 4 | 28.6 | – | 34.5 | 34.5 | 13 | 52 | 41 | 3.55 |
| 32 | 1¼ | 42.4 | 160 | 158.7 | 111.1 | 26 | 25.4 | 4 | 28.6 | – | 43.5 | 43.2 | 14 | 64 | 41 | 4.02 |
| 40 | 1½ | 48.3 | 180 | 177.8 | 123.8 | 30 | 28.4 | 4 | 31.8 | – | 49.5 | 49.5 | 16 | 70 | 44 | 5.45 |
| 50 | 2 | 60.3 | 215 | 215.9 | 165.1 | 26 | 25.4 | 8 | 38.1 | – | 61.5 | 62 | 17 | 105 | 57 | 10.2 |
| 65 | 2½ | 76.1 | 245 | 244.3 | 190.5 | 30 | 28.4 | 8 | 41.3 | – | 77.6 | 74.7 | 19 | 124 | 64 | 13.9 |
Note: The inner diameter B1 of the flange is determined by the wall thickness of the steel pipe. The user should indicate it when ordering. The flange inner diameter B1 listed in the table is equivalent to a steel pipe with a wall thickness of Sch40
## PRODUCT CATALOG
Get Instant Data & Drawings for Your custom flange Solution
### ASME b16.5 Threaded Flange Dimensions
Class 150
Class 300
Class 150
| Nominal size | Steel Pipe outer diameter | Connection size | flange thickness | flange inner diameter | flange neck big end | flange height | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| DN | NPS | A | Flange outer diameter D | Central circle diameter K | Bolt hole diameter L | Number of bolt holes n | Bolt Th | C | B | N | H |
| 15 | 1/2 | 21.3 | 90 | 60.3 | 16 | 4 | M14 | 9.6 | 15.5 | 30 | 46 |
| 20 | 3/4 | 26.9 | 100 | 69.9 | 16 | 4 | M14 | 11.2 | 21 | 38 | 51 |
| 25 | 1 | 33.7 | 110 | 79.4 | 16 | 4 | M14 | 12.7 | 27 | 49 | 54 |
| 32 | 1 1/4 | 42.4 | 115 | 88.9 | 16 | 4 | M14 | 14.3 | 35 | 59 | 56 |
| 40 | 1 1/2 | 48.3 | 125 | 98.4 | 16 | 4 | M14 | 15.9 | 41 | 65 | 60 |
| 50 | 2 | 60.3 | 150 | 120.7 | 18 | 4 | M16 | 17.5 | 52 | 78 | 62 |
| 65 | 2 1/2 | 76.1 | 180 | 139.7 | 18 | 4 | M16 | 20.7 | 66 | 90 | 68 |
| 80 | 3 | 88.9 | 190 | 152.4 | 18 | 4 | M16 | 22.3 | 77.5 | 108 | 68 |
| 100 | 4 | 114.3 | 230 | 190.5 | 18 | 8 | M16 | 22.3 | 101.5 | 135 | 75 |
| 125 | 5 | 139.7 | 255 | 215.9 | 22 | 8 | M20 | 22.3 | 127 | 164 | 87 |
| 150 | 6 | 168.3 | 280 | 241.3 | 22 | 8 | M20 | 23.9 | 154 | 192 | 87 |
| 200 | 8 | 219.1 | 345 | 298.5 | 22 | 8 | M20 | 27 | 203 | 246 | 100 |
| 250 | 10 | 273 | 405 | 362 | 26 | 12 | M24 | 28.6 | 255 | 305 | 100 |
| 300 | 12 | 323.9 | 485 | 431.8 | 26 | 12 | M24 | 30.2 | 303.5 | 365 | 113 |
| 350 | 14 | 355.6 | 535 | 476.3 | 30 | 12 | M27 | 33.4 | – | 400 | 125 |
| 400 | 16 | 406.4 | 595 | 539.8 | 30 | 16 | M27 | 35 | – | 457 | 125 |
| 450 | 18 | 457 | 635 | 577.9 | 33 | 16 | M30 | 38.1 | – | 505 | 138 |
| 500 | 20 | 508 | 700 | 635 | 33 | 20 | M30 | 41.3 | – | 559 | 143 |
| 600 | 24 | 610 | 815 | 749.3 | 36 | 20 | M33 | 46.1 | – | 663 | 151 |
Class 300
| Nominal size | Steel Pipe outer diameter | Connection size | flange thickness | flange inner diameter | flange neck big end | flange height | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| DN | NPS | A | Flange outer diameter D | Central circle diameter K | Bolt hole diameter L | Number of bolt holes n | Bolt Th | C | B | N | H |
| 15 | 1/2 | 21.3 | 95 | 66.7 | 16 | 4 | M14 | 12.7 | 15.5 | 38 | 51 |
| 20 | 3/4 | 26.9 | 115 | 82.6 | 18 | 4 | M16 | 14.3 | 21 | 48 | 56 |
| 25 | 1 | 33.7 | 125 | 88.9 | 18 | 4 | M16 | 15.9 | 27 | 54 | 60 |
| 32 | 1 1/4 | 42.4 | 135 | 98.4 | 18 | 4 | M16 | 17.5 | 35 | 64 | 64 |
| 40 | 1 1/2 | 48.3 | 155 | 114.3 | 22 | 4 | M20 | 19.1 | 41 | 70 | 67 |
| 50 | 2 | 60.3 | 165 | 127 | 18 | 8 | M16 | 20.7 | 52 | 84 | 68 |
| 65 | 2 1/2 | 76.1 | 190 | 149.2 | 22 | 8 | M20 | 23.9 | 66 | 100 | 75 |
| 80 | 3 | 88.9 | 210 | 168.3 | 22 | 8 | M20 | 27 | 77.5 | 117 | 78 |
| 100 | 4 | 114.3 | 255 | 200 | 22 | 8 | M20 | 30.2 | 101.5 | 146 | 84 |
| 125 | 5 | 139.7 | 280 | 235 | 22 | 8 | M20 | 33.4 | 127 | 178 | 97 |
| 150 | 6 | 168.3 | 320 | 269.9 | 22 | 12 | M20 | 35 | 154 | 206 | 97 |
| 200 | 8 | 219.1 | 380 | 330.2 | 26 | 12 | M24 | 39.7 | 203 | 260 | 110 |
| 250 | 10 | 273 | 445 | 387.4 | 30 | 16 | M27 | 46.1 | 255 | 321 | 116 |
| 300 | 12 | 323.9 | 520 | 450.8 | 33 | 16 | M30 | 49.3 | 303.5 | 375 | 129 |
| 350 | 14 | 355.6 | 585 | 514.4 | 33 | 20 | M30 | 52.4 | – | 425 | 141 |
| 400 | 16 | 406.4 | 650 | 571.5 | 36 | 20 | M33 | 55.6 | – | 483 | 144 |
| 450 | 18 | 457 | 710 | 628.6 | 36 | 24 | M33 | 58.8 | – | 533 | 157 |
| 500 | 20 | 508 | 775 | 685.8 | 36 | 24 | M33 | 62 | – | 587 | 160 |
| 600 | 24 | 610 | 915 | 812.8 | 42 | 24 | M39X3 | 68.3 | – | 702 | 167 |
### ASME b16.5 Lap Joint Flange Dimensions
Class 150
Class 300
Class 600
Class 150
| Nominal size | Steel Pipe outer diameter | Flange outer diameter | Connection size | flange thickness | Flange inner diameter | Flange neck big end | Flange height | Rounded comers | Butt welding ring | Theotical weight | | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| DN | NPS | A | D | Bolt hole center circle diameter K | Bolt hole diameter L | Bolt hole quantity n(pieces) | C | B | N | H | R1 | high H | outer diameter d | Kg | | |
| 15 | 1/2 | 21.3 | 90 | 88.9 | 60.3 | 16 | 15.7 | 4 | 11.2 | 22.9 | 30 | 16 | 3 | 51 | 34.9 | 0.38 |
| 20 | 3/4 | 26.9 | 100 | 98.6 | 69.9 | 16 | 15.7 | 4 | 12.7 | 28.2 | 38 | 16 | 3 | 51 | 42.9 | 0.55 |
| 25 | 1 | 33.7 | 110 | 108 | 79.4 | 16 | 15.7 | 4 | 14.3 | 34.9 | 49 | 17 | 3 | 51 | 50.8 | 0.76 |
| 32 | 1 1/4 | 42.4 | 115 | 117.3 | 88.9 | 16 | 15.7 | 4 | 15.9 | 43.7 | 59 | 21 | 5 | 51 | 63.5 | 1.01 |
| 40 | 1 1/2 | 48.3 | 125 | 127 | 98.4 | 16 | 15.7 | 4 | 17.5 | 50.0 | 65 | 22 | 6 | 51 | 73.0 | 1.3 |
| 50 | 2 | 60.3 | 150 | 152.4 | 120.7 | 18 | 19.1 | 4 | 19.1 | 62.5 | 78 | 25 | 8 | 64 | 92.1 | 2.03 |
| 65 | 2 1/2 | 76.1 | 180 | 177.8 | 139.7 | 18 | 19.1 | 4 | 22.3 | 78.5/75.4 | 90 | 29 | 8 | 64 | 104.8 | 3.25 |
| 80 | 3 | 88.9 | 190 | 190.5 | 152.4 | 18 | 19.1 | 4 | 23.9 | 91.4 | 108 | 30 | 10 | 64 | 127.0 | 3.81 |
| 100 | 4 | 114.3 | 230 | 228.6 | 190.5 | 18 | 19.1 | 8 | 23.9 | 116.8 | 135 | 33 | 11 | 76 | 157.2 | 5.25 |
| 125 | 5 | 139.7 | 255 | 254 | 215.9 | 22 | 22.4 | 8 | 23.9 | 144.4 | 164 | 36 | 11 | 76 | 185.7 | 6.02 |
| 150 | 6 | 168.3 | 280 | 278.4 | 241.3 | 22 | 22.4 | 8 | 25.4 | 171.4 | 192 | 40 | 13 | 89 | 215.9 | 7.4 |
| 200 | 8 | 219.1 | 345 | 342.9 | 298.58 | 22 | 22.4 | 8 | 28.6 | 222.2 | 246 | 44 | 13 | 102 | 269.9 | 12.1 |
| 250 | 10 | 273 | 405 | 406.4 | 362.0 | 26 | 25.4 | 12 | 30.2 | 277.4 | 305 | 49 | 13 | 127 | 323.8 | 16.4 |
| 300 | 12 | 323.9 | 485 | 482.6 | 431.8 | 26 | 25.4 | 12 | 31.8 | 328.2 | 365 | 56 | 13 | 152 | 381.0 | 26.1 |
| 350 | 14 | 355.6 | 535 | 533.4 | 476.2 | 30 | 28.4 | 12 | 35.0 | 360.2 | 400 | 79 | 13 | 152 | 412.8 | 34.5 |
| 400 | 16 | 406.4 | 595 | 596.9 | 539.8 | 30 | 28.4 | 16 | 36.6 | 411.2 | 457 | 87 | 13 | 152 | 469.9 | 44.6 |
| 450 | 18 | 457 | 635 | 635 | 577.9 | 33 | 31.75 | 16 | 39.7 | 462.3 | 505 | 97 | 13 | 152 | 533.4 | 48.7 |
| 500 | 20 | 508 | 700 | 698.5 | 635.0 | 33 | 31.75 | 20 | 42.9 | 514.4 | 559 | 103 | 13 | 152 | 584.2 | 61.6 |
| 600 | 24 | 610 | 815 | 812.8 | 749.3 | 36 | 35.1 | 20 | 47.7 | 616.0 | 663 | 111 | 13 | 152 | 692.2 | 86.6 |
Class 300
| Nominal size | Steel Pipe outer diameter | Flange outer diameter | Connection size | flange thickness | Flange inner diameter | Flange neck big end | Flange height | Rounded corners | Butt welding ring | Theotical weight | | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| DN | NPS | A | D | Bolt hole center circle diameter K | Bolt hole diameter L | Bolt hole quantity n(pieces) | C | B | N | H | R1 | high H | outer diameter d | Kg | | |
| 15 | 1/2 | 21.3 | 95 | 88.9 | 66.7 | 16 | 15.7 | 4 | 14.3 | 22.9 | 38 | 22 | 3 | 51 | 34.9 | 0.62 |
| 20 | 3/4 | 26.9 | 115 | 98.6 | 82.6 | 18 | 15.7 | 4 | 15.9 | 28.2 | 48 | 25 | 3 | 51 | 42.9 | 1.1 |
| 25 | 1 | 33.7 | 125 | 108 | 88.9 | 18 | 15.7 | 4 | 17.5 | 34.9 | 54 | 27 | 3 | 51 | 50.8 | 1.33 |
| 32 | 1 1/4 | 42.4 | 135 | 117.3 | 98.4 | 18 | 15.7 | 4 | 19.1 | 43.7 | 64 | 27 | 5 | 51 | 63.5 | 1.65 |
| 40 | 1 1/2 | 48.3 | 155 | 127 | 114.3 | 22 | 15.7 | 4 | 20.7 | 50.0 | 70 | 30 | 6 | 51 | 73.0 | 2.44 |
| 50 | 2 | 60.3 | 165 | 152.4 | 127.0 | 18 | 19.1 | 8 | 22.3 | 62.5 | 84 | 33 | 8 | 64 | 92.1 | 2.83 |
| 65 | 2 1/2 | 76.1 | 190 | 177.8 | 149.2 | 22 | 19.1 | 8 | 25.4 | 78.5/75.4 | 100 | 38 | 8 | 64 | 104.8 | 4.25 |
| 80 | 3 | 88.9 | 210 | 190.5 | 168.3 | 22 | 19.1 | 8 | 28.6 | 91.4 | 117 | 43 | 10 | 64 | 127.0 | 5.78 |
| 100 | 4 | 114.3 | 255 | 228.6 | 200.0 | 22 | 19.1 | 8 | 31.8 | 116.8 | 146 | 48 | 11 | 76 | 157.2 | 9.55 |
| 125 | 5 | 139.7 | 280 | 254 | 235.0 | 22 | 22.4 | 8 | 35.0 | 144.4 | 178 | 51 | 11 | 76 | 185.7 | 12.2 |
| 150 | 6 | 168.3 | 320 | 279.4 | 269.9 | 22 | 22.4 | 12 | 36.6 | 171.4 | 206 | 52 | 13 | 89 | 215.9 | 15.5 |
| 200 | 8 | 219.1 | 380 | 342.9 | 330.2 | 26 | 22.4 | 12 | 41.3 | 222.2 | 260 | 62 | 13 | 102 | 269.9 | 24.1 |
| 250 | 10 | 273 | 445 | 406.4 | 387.4 | 30 | 25.4 | 16 | 47.7 | 277.1 | 321 | 95 | 13 | 254 | 323.8 | 34.4 |
| 300 | 12 | 323.9 | 520 | 482.6 | 450.8 | 33 | 25.4 | 16 | 50.8 | 328.2 | 375 | 102 | 13 | 254 | 381.0 | 50.4 |
| 350 | 14 | 355.6 | 585 | 533.4 | 514.4 | 33 | 28.4 | 20 | 54.0 | 360.2 | 425 | 111 | 13 | 305 | 412.8 | 70.9 |
| 400 | 16 | 406.4 | 650 | 596.9 | 571.5 | 36 | 28.4 | 20 | 57.2 | 411.2 | 483 | 121 | 13 | 305 | 469.9 | 89.5 |
| 450 | 18 | 457 | 710 | 635 | 628.6 | 36 | 31.75 | 24 | 60.4 | 462.3 | 533 | 130 | 13 | 305 | 533.4 | 111 |
| 500 | 20 | 508 | 775 | 698.5 | 685.8 | 36 | 31.75 | 24 | 63.5 | 514.4 | 587 | 140 | 13 | 305 | 584.2 | 137 |
| 600 | 24 | 610 | 915 | 812.8 | 812.8 | 42 | 35.1 | 24 | 69.9 | 616.0 | 702 | 152 | 13 | 305 | 692.2 | 204 |
Class 600
| Nominal size | Steel Pipe outer diameter | Flange outer diameter | Connection size | flange thickness | Flange inner diameter | Flange neck big end | Flange height | Rounded corners | Butt welding ring | Theotical weight | | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| DN | NPS | A | D | Bolt hole center circle diameter K | Bolt hole diameter L | Bolt hole quantity n(pieces) | C | B | N | H | R1 | high H | outer diameter d | Kg | | |
| 15 | 1/2 | 21.3 | 95 | 88.9 | 66.7 | 16 | 15.7 | 4 | 14.3 | 22.9 | 38 | 22 | 3 | 76 | 34.9 | 0.72 |
| 20 | 3/4 | 26.9 | 115 | 98.6 | 82.6 | 18 | 15.7 | 4 | 15.9 | 28.2 | 48 | 25 | 3 | 76 | 42.9 | 1.25 |
| 25 | 1 | 33.7 | 125 | 108 | 88.9 | 18 | 15.7 | 4 | 17.5 | 34.9 | 54 | 27 | 3 | 102 | 50.8 | 1.5 |
| 32 | 11/4 | 42.4 | 135 | 117.3 | 98.4 | 18 | 15.7 | 4 | 20.7 | 43.7 | 64 | 29 | 5 | 102 | 63.5 | 2 |
| 40 | 11/2 | 48.3 | 155 | 127 | 114.3 | 22 | 15.7 | 4 | 22.3 | 50.0 | 70 | 32 | 6 | 102 | 73.0 | 2.92 |
| 50 | 2 | 60.3 | 165 | 152.4 | 127.0 | 18 | 19.1 | 8 | 25.4 | 62.5 | 84 | 37 | 8 | 152 | 92.1 | 3.55 |
| 65 | 21/2 | 76.1 | 190 | 177.8 | 149.2 | 22 | 19.1 | 8 | 28.6 | 78.5/75.4 | 100 | 41 | 8 | 152 | 104.8 | 5.23 |
| 80 | 3 | 88.9 | 210 | 190.5 | 168.3 | 22 | 19.1 | 8 | 31.8 | 91.4 | 117 | 46 | 10 | 152 | 127.0 | 6.95 |
| 100 | 4 | 114.3 | 275 | 228.6 | 215.9 | 26 | 19.1 | 8 | 38.1 | 116.8 | 152 | 54 | 11 | 152 | 157.2 | 14.4 |
| 125 | 5 | 139.7 | 330 | 254 | 266.7 | 30 | 22.4 | 8 | 44.5 | 144.4 | 189 | 60 | 11 | 203 | 185.7 | 24.3 |
| 150 | 6 | 168.3 | 355 | 279.4 | 292.1 | 30 | 22.4 | 12 | 47.7 | 171.4 | 222 | 67 | 13 | 203 | 215.9 | 28.5 |
| 200 | 8 | 219.1 | 420 | 342.9 | 349.2 | 33 | 22.4 | 12 | 55.6 | 222.2 | 273 | 76 | 13 | 203 | 269.9 | 43.1 |
| 250 | 10 | 273 | 510 | 406.4 | 431.8 | 36 | 25.4 | 16 | 63.5 | 277.4 | 343 | 111 | 13 | 254 | 323.8 | 70.5 |
| 300 | 12 | 323.9 | 560 | 482.6 | 489.0 | 36 | 25.4 | 20 | 66.7 | 328.2 | 400 | 117 | 13 | 254 | 381.0 | 86.1 |
| 350 | 14 | 355.6 | 605 | 533.4 | 527.0 | 39 | 28.4 | 20 | 69.9 | 360.2 | 432 | 127 | 13 | 305 | 412.8 | 100 |
| 400 | 16 | 406.4 | 685 | 596.9 | 603.2 | 42 | 28.4 | 20 | 76.2 | 411.2 | 495 | 140 | 13 | 305 | 469.9 | 145 |
| 450 | 18 | 457 | 745 | 635 | 654.0 | 45 | 31.75 | 20 | 82.6 | 462.3 | 546 | 152 | 13 | 305 | 533.4 | 177 |
| 500 | 20 | 508 | 815 | 698.5 | 723.9 | 45 | 31.75 | 24 | 88.9 | 514.4 | 610 | 165 | 13 | 305 | 584.2 | 225 |
| 600 | 24 | 610 | 940 | 812.8 | 838.2 | 51 | 35.1 | 24 | 101.6 | 616.0 | 718 | 184 | 13 | 305 | 692.2 | 318 |
### ASME b16.5 Blind Flange Dimensions
Class 150
Class 300
Class 600
Class 900
Class 1500
Class 2500
Class 150
| Nominal size | Connection size | flange thickness | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- |
| DN | NPS | Flange outer diameter D | Central circle diameter K | Bolt hole diameter L | Number of bolt holes n | Bolt Th | C |
| 15 | 1/2 | 90 | 60.3 | 16 | 4 | M14 | 9.6 |
| 20 | 3/4 | 100 | 69.9 | 16 | 4 | M14 | 11.2 |
| 25 | 1 | 110 | 79.4 | 16 | 4 | M14 | 12.7 |
| 32 | 1 1/4 | 115 | 88.9 | 16 | 4 | M14 | 14.3 |
| 40 | 1 1/2 | 125 | 98.4 | 16 | 4 | M14 | 15.9 |
| 50 | 2 | 150 | 120.7 | 18 | 4 | M16 | 17.5 |
| 65 | 2 1/2 | 180 | 139.7 | 18 | 4 | M16 | 20.7 |
| 80 | 3 | 190 | 152.4 | 18 | 4 | M16 | 22.3 |
| 100 | 4 | 230 | 190.5 | 18 | 8 | M16 | 22.3 |
| 125 | 5 | 255 | 215.9 | 22 | 8 | M20 | 22.3 |
| 150 | 6 | 280 | 241.3 | 22 | 8 | M20 | 23.9 |
| 200 | 8 | 345 | 298.58 | 22 | 8 | M20 | 27.0 |
| 250 | 10 | 405 | 362.0 | 26 | 12 | M24 | 28.6 |
| 300 | 12 | 485 | 431.8 | 26 | 12 | M24 | 30.2 |
| 350 | 14 | 535 | 476.3 | 30 | 12 | M27 | 33.4 |
| 400 | 16 | 595 | 539.8 | 30 | 16 | M27 | 35.0 |
| 450 | 18 | 635 | 577.9 | 33 | 16 | M30 | 38.1 |
| 500 | 20 | 700 | 635.0 | 33 | 20 | M30 | 41.3 |
| 600 | 24 | 815 | 749.3 | 36 | 20 | M33 | 46.1 |
Class 300
| Nominal size | Connection size | flange thickness | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- |
| DN | NPS | Flange outer diameter D | Central circle diameter K | Bolt hole diameter L | Number of bolt holes n | Bolt Th | C |
| 15 | 1/2 | 95 | 66.7 | 16 | 4 | M14 | 12.7 |
| 20 | 3/4 | 115 | 82.6 | 18 | 4 | M16 | 14.3 |
| 25 | 1 | 125 | 88.9 | 18 | 4 | M16 | 15.9 |
| 32 | 1 1/4 | 135 | 98.4 | 18 | 4 | M16 | 17.5 |
| 40 | 1 1/2 | 155 | 114.3 | 22 | 4 | M20 | 19.1 |
| 50 | 2 | 165 | 127.0 | 18 | 8 | M16 | 20.7 |
| 65 | 2 1/2 | 190 | 149.2 | 22 | 8 | M20 | 23.9 |
| 80 | 3 | 210 | 168.3 | 22 | 8 | M20 | 27.0 |
| 100 | 4 | 255 | 200.0 | 22 | 8 | M20 | 30.2 |
| 125 | 5 | 280 | 235.0 | 22 | 8 | M20 | 33.4 |
| 150 | 6 | 320 | 269.9 | 22 | 12 | M20 | 35.0 |
| 200 | 8 | 380 | 330.2 | 26 | 12 | M24 | 39.7 |
| 250 | 10 | 445 | 387.4 | 30 | 16 | M27 | 46.1 |
| 300 | 12 | 520 | 450.8 | 33 | 16 | M30 | 49.3 |
| 350 | 14 | 585 | 514.4 | 33 | 20 | M30 | 52.4 |
| 400 | 16 | 650 | 571.5 | 36 | 20 | M33 | 55.6 |
| 450 | 18 | 710 | 628.6 | 36 | 24 | M33 | 58.8 |
| 500 | 20 | 775 | 685.8 | 36 | 24 | M33 | 62.0 |
| 600 | 24 | 915 | 812.8 | 42 | 24 | M39X3 | 68.3 |
Class 600
| Nominal size | Connection size | flange thickness | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- |
| DN | NPS | Flange outer diameter D | Central circle diameter K | Bolt hole diameter L | Number of bolt holes n | Bolt Th | C |
| 15 | 1/2 | 95 | 66.7 | 16 | 4 | M14 | 14.3 |
| 20 | 3/4 | 115 | 82.6 | 18 | 4 | M16 | 15.9 |
| 25 | 1 | 125 | 88.9 | 18 | 4 | M16 | 17.5 |
| 32 | 1 1/4 | 135 | 98.4 | 18 | 4 | M16 | 20.7 |
| 40 | 1 1/2 | 155 | 114.3 | 22 | 4 | M20 | 22.3 |
| 50 | 2 | 165 | 127.0 | 18 | 8 | M16 | 25.4 |
| 65 | 2 1/2 | 190 | 149.2 | 22 | 8 | M20 | 28.6 |
| 80 | 3 | 210 | 168.3 | 22 | 8 | M20 | 31.8 |
| 100 | 4 | 275 | 215.9 | 26 | 8 | M24 | 38.1 |
| 125 | 5 | 330 | 266.7 | 30 | 8 | M27 | 44.5 |
| 150 | 6 | 355 | 292.1 | 30 | 12 | M27 | 47.7 |
| 200 | 8 | 420 | 349.2 | 33 | 12 | M30 | 55.6 |
| 250 | 10 | 510 | 431.8 | 36 | 16 | M33 | 63.5 |
| 300 | 12 | 560 | 489.0 | 36 | 20 | M33 | 66.7 |
| 350 | 14 | 605 | 527.0 | 39 | 20 | M36X3 | 69.9 |
| 400 | 16 | 685 | 603.2 | 42 | 20 | M39X3 | 76.2 |
| 450 | 18 | 745 | 654.0 | 45 | 20 | M42X3 | 82.6 |
| 500 | 20 | 815 | 723.9 | 45 | 24 | M42X3 | 88.9 |
| 600 | 24 | 940 | 838.2 | 51 | 24 | M48X3 | 101.6 |
Class 900
| Nominal size | Connection size | flange thickness | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- |
| DN | NPS | Flange outer diameter D | Central circle diameter K | Bolt hole diameter L | Number of bolt holes n | Bolt Th | C |
| 15 | 1/2 | 120 | 82.6 | 22 | 4 | M20 | 22.3 |
| 20 | 3/4 | 130 | 88.9 | 22 | 4 | M20 | 25.4 |
| 25 | 1 | 150 | 101.6 | 26 | 4 | M24 | 28.6 |
| 32 | 1 1/4 | 160 | 111.1 | 26 | 4 | M24 | 28.6 |
| 40 | 1 1/2 | 180 | 123.8 | 30 | 4 | M27 | 31.8 |
| 50 | 2 | 215 | 165.1 | 26 | 8 | M24 | 38.1 |
| 65 | 2 1/2 | 245 | 190.5 | 30 | 8 | M27 | 41.3 |
| 80 | 3 | 265 | 203.2 | 33 | 8 | M30 | 47.7 |
| 100 | 4 | 310 | 241.3 | 36 | 8 | M33 | 54.0 |
| 125 | 5 | 375 | 292.1 | 42 | 8 | M39X3 | 73.1 |
| 150 | 6 | 395 | 317.5 | 39 | 12 | M36X3 | 82.6 |
| 200 | 8 | 485 | 393.7 | 45 | 12 | M42X3 | 92.1 |
| 250 | 10 | 585 | 482.6 | 51 | 12 | M48X3 | 108.0 |
| 300 | 12 | 675 | 571.5 | 55 | 16 | M52X3 | 123.9 |
| 350 | 14 | 750 | 635.0 | 60 | 16 | M56X3 | 133.4 |
| 400 | 16 | 825 | 704.8 | 68 | 16 | M64X3 | 146.1 |
| 450 | 18 | 915 | 774.7 | 74 | 16 | M70X3 | 162.0 |
| 500 | 20 | 985 | 831.8 | 80 | 16 | M76X3 | 177.8 |
| 600 | 24 | 1170 | 990.6 | 94 | 16 | M90X3 | 203.2 |
Class 1500
| Nominal size | Connection size | flange thickness | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- |
| DN | NPS | Flange outer diameter D | Central circle diameter K | Bolt hole diameter L | Number of bolt holes n | Bolt Th | C |
| 15 | 1/2 | 120 | 82.6 | 22 | 4 | M20 | 22.3 |
| 20 | 3/4 | 130 | 88.9 | 22 | 4 | M20 | 25.4 |
| 25 | 1 | 150 | 101.6 | 26 | 4 | M24 | 28.6 |
| 32 | 1 1/4 | 160 | 111.1 | 26 | 4 | M24 | 28.6 |
| 40 | 1 1/2 | 180 | 123.8 | 30 | 4 | M27 | 31.8 |
| 50 | 2 | 215 | 165.1 | 26 | 8 | M24 | 38.1 |
| 65 | 2 1/2 | 245 | 190.5 | 30 | 8 | M27 | 41.3 |
| 80 | 3 | 240 | 190.5 | 26 | 8 | M24 | 38.1 |
| 100 | 4 | 290 | 235.0 | 33 | 8 | M30 | 44.5 |
| 125 | 5 | 350 | 279.4 | 36 | 8 | M33 | 50.8 |
| 150 | 6 | 380 | 317.5 | 33 | 12 | M30 | 55.6 |
| 200 | 8 | 470 | 393.7 | 39 | 12 | M36X3 | 63.5 |
| 250 | 10 | 545 | 469.9 | 39 | 16 | M36X3 | 69.9 |
| 300 | 12 | 610 | 533.4 | 39 | 20 | M36X3 | 79.4 |
| 350 | 14 | 640 | 558.8 | 42 | 20 | M39X3 | 85.8 |
| 400 | 16 | 705 | 616.0 | 45 | 20 | M42X3 | 88.9 |
| 450 | 18 | 785 | 685.8 | 51 | 20 | M48X3 | 101.6 |
| 500 | 20 | 855 | 749.3 | 55 | 20 | M52X3 | 108.0 |
| 600 | 24 | 1040 | 901.7 | 68 | 20 | M64X3 | 139.7 |
Class 2500
| Nominal size | Connection size | flange thickness | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- |
| DN | NPS | Flange outer diameter D | Central circle diameter K | Bolt hole diameter L | Number of bolt holes n | Bolt Th | C |
| 15 | 1/2 | 135 | 88.9 | 22 | 4 | M20 | 30.2 |
| 20 | 3/4 | 140 | 95.2 | 22 | 4 | M20 | 31.8 |
| 25 | 1 | 160 | 108.0 | 26 | 4 | M24 | 35.0 |
| 32 | 1 1/4 | 185 | 130.2 | 30 | 4 | M27 | 38.1 |
| 40 | 1 1/2 | 205 | 146.0 | 33 | 4 | M30 | 44.5 |
| 50 | 2 | 235 | 171.4 | 30 | 8 | M27 | 50.9 |
| 65 | 2 1/2 | 265 | 196.8 | 33 | 8 | M30 | 57.2 |
| 80 | 3 | 305 | 228.6 | 36 | 8 | M33 | 66.7 |
| 100 | 4 | 355 | 273.0 | 42 | 8 | M39X3 | 76.2 |
| 125 | 5 | 420 | 323.8 | 48 | 8 | M45X3 | 92.1 |
| 150 | 6 | 485 | 368.3 | 55 | 8 | M52X3 | 108.0 |
| 200 | 8 | 550 | 438.2 | 55 | 12 | M52X3 | 127.0 |
| 250 | 10 | 675 | 539.8 | 68 | 12 | M64X3 | 165.1 |
| 300 | 12 | 760 | 619.1 | 74 | 12 | M70X3 | 184.2 |
NEED HELP? Speek to specialist to find the flange for you
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](#form)
## What is ASME B16.5 Flange?
ASME B16.5 is a critical standard that specifies requirements for pipe flanges and flanged fittings.
It covers sizes from NPS 1/2 through NPS 24 for pressure classes 150 to 1500, and up to NPS 12 for class 2500. The standard details pressure-temperature ratings, material specifications, dimensions, tolerances, and marking requirements.
It applies to components made from cast or forged materials and includes specifications for flange types like slip-on, threaded, and weld neck flanges.
This standardization ensures consistency across industries, facilitates proper component selection, and maintains safety in piping systems.
[ Product List
](https://longanflange.com/wp-content/uploads/2024/10/38821c5b46531428e47c.pdf)
## [KEY FEATURES OF ASME B16.5 FLANGE](https://longanflange.com/product_cat/pressure-vessel-flange-series/)
### Pressure Ratings
ASME B16.5 flanges are classified into pressure classes (150#, 300#, 600#, 900#, 1500#, 2500#) with corresponding temperature ratings. This ASME B16.5 standard defines maximum allowable working pressures at various temperatures for different flange materials.
Material Class
ASME B16.5 groups flange materials into categories (such as Group 1.1, 1.2, etc.) based on their chemical composition and mechanical properties. This standardization ensures proper material selection for specific operating conditions.
Dimensional Standards
The ASME B16.5 specification provides precise dimensional requirements for flange face-to-face length, thickness, bolt hole size and positioning, raised face height, and overall diameter, ensuring universal interchangeability.
Flange Face Types
ASME B16.5 flanges feature various face types including raised face (RF), flat face (FF), ring-type joint (RTJ), and large/small tongue-and-groove, accommodating different sealing requirements and applications.
Size Range Coverage
ASME B16.5 standard covers flange sizes from NPS 1/2 through NPS 24 inches, making it the most widely used specification for small to medium-sized pipe flanges in industrial applications.
Surface Finishing
ASME B16.5 specifies surface finish requirements for different flange faces, particularly for raised face flanges, ensuring proper gasket seating and leak-tight connections under various service conditions.
## ASME B16.5 FLANGE DIMENSIONS
[Slip On Flange](#slipondimension)
[Weld Neck Flange](#weldneckdimension)
[Socket Weld Flange](#socketwelddimension)
[Threaded Flange](#threadeddimension)
[Lap Joint Flange](#lapjointdimension)
[Blind Flange](#blinddimension)
Ask for ASME Flange at your BEST PRICE!
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](#form)
Có những loại mặt bích ASME nào?
Các loại mặt bích ASME phổ biến nhất bao gồm mặt bích trượt, mặt bích cổ hàn, mặt bích hàn ổ cắm, mặt bích mù, mặt bích ghép chồng và mặt bích ren. Mỗi loại có ứng dụng và phương pháp lắp đặt cụ thể.
ASME B16.5 là gì?
ASME B16.5 là tiêu chuẩn chỉ định các yêu cầu đối với mặt bích ống và phụ kiện có mặt bích, bao gồm các kích thước từ NPS ½” đến 24” và các cấp áp suất từ 150 đến 2500. Tiêu chuẩn này nêu chi tiết các kích thước, vật liệu, định mức áp suất-nhiệt độ và các yêu cầu thử nghiệm.
Làm thế nào để chọn đúng mặt bích ASME cho ứng dụng của tôi?
Khi lựa chọn mặt bích ASME, hãy cân nhắc các yếu tố như khả năng tương thích của vật liệu, định mức áp suất-nhiệt độ, loại mặt bích (ví dụ: mặt bích trượt hoặc mặt bích hàn) và các yêu cầu cụ thể của hệ thống đường ống của bạn.
Những vật liệu nào thường được sử dụng cho mặt bích ASME?
Mặt bích ASME thường được làm từ các vật liệu như thép cacbon, thép không gỉ và thép hợp kim. Việc lựa chọn vật liệu phụ thuộc vào ứng dụng và điều kiện môi trường
Cấp áp suất định mức của mặt bích ASME chỉ ra điều gì?
Xếp hạng lớp áp suất cho biết áp suất tối đa cho phép đối với mặt bích ở nhiệt độ nhất định. Các lớp phổ biến bao gồm 150, 300, 600, 900, 1500 và 2500
Mặt bích ASME có thể hoán đổi với các tiêu chuẩn khác không?
Mặc dù mặt bích ASME được thiết kế để đáp ứng các tiêu chuẩn cụ thể, nhưng chúng có thể không thể hoán đổi trực tiếp với các loại khác như mặt bích ASTM mà không xác minh rằng chúng đáp ứng các định mức về kích thước và áp suất cần thiết
Ý nghĩa của các loại mặt bích là gì?
Các loại mặt bích (như mặt nhô lên hoặc mặt phẳng) ảnh hưởng đến mức độ kín của mặt bích bằng miếng đệm và tác động đến hiệu suất của nó trong các ứng dụng áp suất cao
Mặt bích ASME được kiểm tra chất lượng như thế nào?
Mặt bích ASME trải qua nhiều thử nghiệm khác nhau để đảm bảo chúng đáp ứng các tiêu chuẩn về an toàn và hiệu suất, bao gồm thử nghiệm áp suất, xác minh vật liệu và kiểm tra kích thước
Những ngành công nghiệp nào thường sử dụng mặt bích ASME?
Mặt bích ASME được sử dụng rộng rãi trong các ngành công nghiệp như dầu khí, chế biến hóa chất, phát điện, xử lý nước, chế biến thực phẩm và các ứng dụng hàng hải do độ tin cậy và tuân thủ các tiêu chuẩn an toàn
Sự khác biệt giữa mặt bích ANSI và ASME là gì?
ANSI (Viện Tiêu chuẩn Quốc gia Hoa Kỳ) tập trung vào việc thiết lập các tiêu chuẩn kỹ thuật trong khi ASME (Hiệp hội Kỹ sư Cơ khí Hoa Kỳ) tập trung vào các tiêu chuẩn thiết bị cơ khí. Cả hai tổ chức đều hợp tác với nhau để đảm bảo các tiêu chuẩn kỹ thuật chung; tuy nhiên, các tiêu chuẩn ASME thường bao gồm các thông số kỹ thuật chi tiết hơn liên quan đến định mức áp suất và tiêu chí thiết kế