Class 1500255.3 bar @ 38 °C · Group 1.1
ASME B16.5 Class 1500 stud bolt chart
Studs here reach 3½ in diameter and 20 in length. At this size the joint is normally tensioned hydraulically rather than torqued, and stud straightness and thread quality stop being cosmetic.
No matching rows.
| NPS | Qty | Stud size | ≈ metric | Bolt circle | Stud length (in) | Stud length (mm) |
|---|---|---|---|---|---|---|
| ½" | 4 | ¾" | M20 | 3.25" · 85 mm | 3.5" | 90 |
| ¾" | 4 | ¾" | M20 | 3.5" · 90 mm | 3.75" | 95 |
| 1" | 4 | ⅞" | M22 | 4" · 100 mm | 4.25" | 110 |
| 1¼" | 4 | ⅞" | M22 | 4.38" · 110 mm | 4.25" | 110 |
| 1½" | 4 | 1" | M24 | 4.88" · 125 mm | 4.75" | 120 |
| 2" | 8 | ⅞" | M22 | 6.5" · 165 mm | 5" | 125 |
| 2½" | 8 | 1" | M24 | 7.5" · 190 mm | 5.5" | 140 |
| 3" | 8 | 1⅛" | M27 | 8" · 205 mm | 6" | 150 |
| 4" | 8 | 1¼" | M30 | 9.5" · 240 mm | 6.75" | 170 |
| 5" | 8 | 1½" | M36 | 11.5" · 290 mm | 8" | 205 |
| 6" | 12 | 1⅜" | M33 | 12.5" · 320 mm | 7.75" | 195 |
| 8" | 12 | 1⅝" | M39 | 15.5" · 395 mm | 9.25" | 235 |
| 10" | 12 | 1⅞" | M45 | 19" · 485 mm | 10.75" | 275 |
| 12" | 16 | 2" | M48 | 22.5" · 570 mm | 11.5" | 290 |
| 14" | 16 | 2¼" | M56 | 25" · 635 mm | 13" | 330 |
| 16" | 16 | 2½" | M64 | 27.75" · 705 mm | 14.25" | 360 |
| 18" | 16 | 2¾" | M68 | 30.5" · 775 mm | 15.75" | 400 |
| 20" | 16 | 3" | M72 | 32.75" · 830 mm | 17" | 430 |
| 24" | 16 | 3½" | M85 | 39" · 990 mm | 20" | 510 |
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