Quick-reference torque values for #10 bolts across all SAE grades. Dry steel, UNC thread.
Values assume dry/plain steel (K = 0.20) and UNC thread. See full details →
A dry #10 Grade 5 bolt takes 3.53 ft·lbs (4.79 N·m) on the coarse 24 TPI thread. Oiled, that falls to 2.65 ft·lbs; the dry figure on an oiled bolt overshoots the intended clamp load by about 33%. Grade 8 needs 4.99 ft·lbs (41% more), and the fine 32 TPI thread raises the Grade 5 figure to 4.04 ft·lbs.
#10 is a machine-screw size. SAE J429 formally starts at 1/4", so the grade figures here apply the same proof stress to screws sold as Grade 5 or Grade 8 equivalents; check the supplier's rating. The torques are small enough that an in·lb torque screwdriver or a 1/4" drive wrench is the right tool, and the female thread in a tapped part will usually strip before a Grade 5 screw breaks.
ft·lbs unless noted. Clamp load is the 75%-of-proof preload in lbs.
| UNC (coarse) | #10-24 |
| UNF (fine) | #10-32 |
| Stress area (UNC / UNF) | 0.0175 / 0.02 in² |
| Hex wrench size | 3/8" (hex machine screw) |
| Tap drill (UNC / UNF) | #25 / #21 |
Threads per ASME B1.1; tap drills for about 75% thread engagement.