Top Lock Nut
A locknut with a crimped top to prevent loosening. It does this by slightly distorting the threads of the mating part. Good in high heat applications (up to 450°F). Threads on the mating part are unusable after using a top lock nut. Commonly used in the automotive industry.
Other Names: Stover Nut, All Metal Locknut, Prevailing Torque Nut
Typical Dimensions
| Thread Dia. | Across Flats | Thickness |
|---|---|---|
| 1/4 | 7/16 | 0.212 - 0.226 |
| 5/16 | 1/2 | 0.258 - 0.273 |
| 3/8 | 9/16 | 0.320 - 0.337 |
| 7/16 | 11/16 | 0.365 - 0.385 |
| 1/2 | 3/4 | 0.427 - 0.448 |
| 9/16 | 7/8 | 0.473 - 0.496 |
| 5/8 | 15/16 | 0.535 - 0.559 |
| 3/4 | 1 1/8 | 0.617 - 0.665 |
| 7/8 | 1 5/16 | 0.724 - 0.776 |
| 1 | 1 1/2 | 0.831 - 0.887 |