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| Standard SAE Bolt Dimensions and Grades |
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| Bolt Assembly Torque (ft-lb)
[N•m
Chart] The torque values in the table are based on the use of lubricated threads. |
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| Coarse Thread | ||||
| Size | Grade 2 Iron | Grade 5 Iron | Grade 8 Iron | Aluminum |
| 1/4-20 (NC) | 6 | 7 | 11 | 6 |
| 5/16-18 (NC) | 18 | 15 | 22 | 12 |
| 3/8-16 (NC) | 30 | 40 | 20 | |
| 7/16-14 (NC) | 32 | 45 | 65 | 35 |
| 1/2-13 (NC) | 50 | 70 | 95 | 55 |
| 9/16-12 (NC) | 70 | 100 | 140 | 80 |
| 5/8-11 (NC) | 100 | 135 | 190 | 110 |
| 3/4-10 (NC) | 175 | 240 | 340 | 190 |
| 7/8-9 (NC) | 360 | 550 | 280 | |
| 1-8 (NC) | 530 | 820 | 420 | |
| Fine Thread | ||||
| Size | Grade 2 Iron | Grade 5 Iron | Grade 8 Iron | Aluminum |
| 1/4-28 (NF) | 6 | 9 | 13 | 7 |
| 5/16-24 (NF) | 12 | 17 | 24 | 14 |
| 3/8-24 (NF) | 30 | 45 | 25 | |
| 7/16-20 (NF) | 36 | 50 | 70 | 40 |
| 1/2-20 (NF) | 55 | 75 | 110 | 60 |
| 9/16-18 (NF) | 80 | 110 | 155 | 85 |
| 5/8-18 (NF) | 110 | 155 | 215 | 120 |
| 3/4-16 (NF) | 200 | 270 | 380 | 210 |
| 7/8-14 (NF) | 390 | 610 | 310 | |
| 1-14 (NF) | 590 | 890 | 480 | |
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