Whitworth Bolt Torques
Torque specifications Whitworth bolts.
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Whitworth bolt torque specifications:
| Bolt Size (in) | Thread pitch (1/in) | Torque (lbf ft) | |||
|---|---|---|---|---|---|
| Grade A & B | Grade C | Grade T | Grade V | ||
| 1/4 | 20 | 5 | 7 | 9 | 10 |
| 5/16 | 18 | 9 | 15 | 18 | 21 |
| 3/8 | 16 | 15 | 27 | 31 | 36 |
| 7/16 | 14 | 24 | 43 | 51 | 58 |
| 1/2 | 12 | 36 | 64 | 79 | 89 |
| 9/16 | 12 | 52 | 94 | 111 | 128 |
| 5/8 | 11 | 73 | 128 | 155 | 175 |
| 3/4 | 11 | 118 | 213 | 259 | 287 |
| 7/8 | 9 | 186 | 322 | 407 | 459 |
| 1 | 8 | 276 | 497 | 611 | 693 |
- coarse threads
- standard dry torque
- Grade A & B - carbon steel - 62720 psi
- Grade S - carbon steel - 112000 psi
- Grade T - carbon steel - 123200 psi
- Grade V - carbon steel - 145600 psi
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