Class 2500425.5 bar @ 38 °C · Group 1.1
ASME B16.5 Class 2500 stud bolt chart
The highest class in B16.5, and it stops at NPS 12. Above that the flange becomes a special or moves to a compact connector.
No matching rows.
| NPS | Qty | Stud size | ≈ metric | Bolt circle | Stud length (in) | Stud length (mm) |
|---|---|---|---|---|---|---|
| ½" | 4 | ¾" | M20 | 3.5" · 90 mm | 4" | 100 |
| ¾" | 4 | ¾" | M20 | 3.75" · 95 mm | 4.25" | 110 |
| 1" | 4 | ⅞" | M22 | 4.25" · 110 mm | 4.75" | 120 |
| 1¼" | 4 | 1" | M24 | 5.12" · 130 mm | 5.25" | 135 |
| 1½" | 4 | 1⅛" | M27 | 5.75" · 145 mm | 5.75" | 145 |
| 2" | 8 | 1" | M24 | 6.75" · 170 mm | 5.75" | 145 |
| 2½" | 8 | 1⅛" | M27 | 7.75" · 195 mm | 6.25" | 160 |
| 3" | 8 | 1¼" | M30 | 9" · 230 mm | 7" | 180 |
| 4" | 8 | 1½" | M36 | 11" · 280 mm | 8.25" | 210 |
| 5" | 8 | 1¾" | M42 | 13" · 330 mm | 10" | 255 |
| 6" | 8 | 2" | M48 | 15.5" · 395 mm | 11.25" | 285 |
| 8" | 12 | 2" | M48 | 19" · 485 mm | 12.25" | 310 |
| 10" | 12 | 2½" | M64 | 23" · 585 mm | 15" | 380 |
| 12" | 12 | 2¾" | M68 | 26.5" · 675 mm | 16.5" | 420 |
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