Jam Nut
These nuts are shorter, or lower profile, than a standard nut. They are tightened to a surface and then another nut is tightened against the jam nut to prevent it from loosening.
Other Names: Thin Nut, Half Nut
Dimensions
ASME B18.2.2
| Thread Dia. | Across Flats | Thickness |
|---|---|---|
| 1/4 | 7/16 | 5/32 |
| 5/16 | 1/2 | 13/16 |
| 3/8 | 9/16 | 7/32 |
| 7/16 | 11/16 | 1/4 |
| 1/2 | 3/4 | 5/16 |
| 9/16 | 7/8 | 5/16 |
| 5/8 | 15/16 | 3/8 |
| 3/4 | 1 1/8 | 27/64 |
| 7/8 | 1 5/16 | 31/64 |
| 1 | 1 1/2 | 35/64 |
| 1 1/8 | 1 11/16 | 39/64 |
| 1 1/4 | 1 7/8 | 23/32 |
| 1 3/8 | 2 1/16 | 25/32 |
| 1 1/2 | 2 1/4 | 27/32 |
| 1 3/4 | 2 5/8 | 31/32 |
| 2 | 3 | 1 3/32 |
| 2 1/4 | 3 3/8 | 1 13/64 |
| 2 1/2 | 3 3/4 | 1 29/64 |