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Standard Reference: Obtain a copy of the GB/T 9124.1-2019 standard, which outlines flange dimensions for various pressure ratings, including PN2.5.
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Check Key Dimensions: For a PN2.5 flange cover, you will need:
- Outer diameter
- Bolt circle diameter
- Number and size of bolt holes
- Flange thickness
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Contact Suppliers: Flange manufacturers or suppliers can provide detailed specifications and dimensions for specific flange ratings.
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Engineering Tools: Use engineering software or tools that include standard flange dimensions.
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Dimensions of PN2.5 flange cover~GB/T9124.1-2019
| Nominal size DN |
Connection size | Flange cover thickness C /mm |
Seal surface diameter d /mm |
Sealing surface height f 1 /mm |
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| Flange outer diameter D /mm |
Bolt hole center circle diameter K /mm |
Bolt hole diameter L /mm |
bolt | |||||
| quantity n / number |
Thread Specification |
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| 10 | 75 | 50 | 11 | 4 | M10 | 12 | 35 | 2 |
| 15 | 80 | 55 | 11 | 4 | M10 | 12 | 40 | 2 |
| 20 | 90 | 65 | 11 | 4 | M10 | 14 | 50 | 2 |
| 25 | 100 | 75 | 11 | 4 | M10 | 14 | 60 | 2 |
| 32 | 120 | 90 | 14 | 4 | M12 | 14 | 70 | 2 |
| 40 | 130 | 100 | 14 | 4 | M12 | 14 | 80 | 3 |
| 50 | 140 | 110 | 14 | 4 | M12 | 14 | 90 | 3 |
| 65 | 160 | 130 | 14 | 4 | M12 | 14 | 110 | 3 |
| 80 | 190 | 150 | 18 | 4 | M16 | 16 | 128 | 3 |
| 100 | 210 | 170 | 18 | 4 | M16 | 16 | 148 | 3 |
| 125 | 240 | 200 | 18 | 8 | M16 | 18 | 178 | 3 |
| 150 | 265 | 225 | 18 | 8 | M16 | 18 | 202 | 3 |
| 200 | 320 | 280 | 18 | 8 | M16 | 20 | 258 | 3 |
| 250 | 375 | 335 | 18 | 12 | M16 | 22 | 312 | 3 |
| 300 | 440 | 395 | 22 | 12 | M20 | 22 | 365 | 4 |
| 350 | 490 | 445 | 22 | 12 | M20 | 22 | 415 | 4 |
| 400 | 540 | 495 | 22 | 16 | M20 | 22 | 455 | 4 |
| 450 | 595 | 550 | 22 | 16 | M20 | 24 | 520 | 4 |
| 500 | 645 | 600 | 22 | 20 | M20 | 24 | 570 | 4 |
| 600 | 755 | 705 | 26 | 20 | M24 | 30 | 670 | 5 |
| 700 | 860 | 810 | 26 | 24 | M24 | 40(36) | 775 | 5 |
| 800 | 975 | 920 | 30 | 24 | M27 | 44(38) | 880 | 5 |
| 900 | 1075 | 1020 | 30 | 24 | M27 | 48(40) | 980 | 5 |
| 1000 | 1175 | 1120 | 30 | 28 | M27 | 52(42) | 1080 | 5 |
| 1200 | 1375 | 1320 | 30 | 32 | M27 | 50(40) | 1280 | 5 |
Note: Flanges with nominal sizes DN10~DN1000 use the size of PN6 flange.
The original flange standard thickness dimensions are in brackets. The flange thickness dimensions in brackets can still be used with the approval of both the supplier and the buyer.
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