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KFN542-8
Locking Assembled Washer Nut Self
Description
Thread Size: 1/2", Head Width: 1/2", KFN542 series nut
Specifications
| Counterbore Diameter | 0.546 inches minimum nut and 0.551 inches maximum nut |
|---|---|
| Hardness Rating | 39.0 rockwell c minimum and 48.0 rockwell c maximum |
| Locking Feature | Prevailing torque all metal design |
| Material | Steel |
| Material Specification | Mil-s-5626 mil spec 1st material response nut or mil-s-5000 mil spec 2nd material response nut or mil-s-6049 mil spec 3rd material response nut |
| Nut Counterbore Depth | 0.087 inches minimum nut and 0.097 inches maximum nut |
| Nut Style | Flat with turned up edge |
| Overall Height | 0.430 inches maximum |
| Special Features | Rockwell c scale 40 min and rockwell c scale 45 max washer |
| Surface Treatment | Cadmium and chromate |
| Surface Treatment Specification | Qq-p-416,ty 2,cl 2 fed spec all treatment responses |
| Temperature Rating | 450.0 deg fahrenheit maximum |
| Thread Class | 3b |
| Thread Direction | Right-hand |
| Thread Qty | 20 |
| Thread Qty Per Inch (tpi) | 20 |
| Thread Series | UNJF |
| Thread Size | 0.500 |
| Washer Outside Diameter | 0.860 inches maximum |
| Width Across Flats | 0.553 inches minimum and 0.564 inches maximum |
Other sizes
Parts that share this base number, ordered by size. Always verify the full specification before substituting.
Cross-reference
No interchangeable or dimensionally similar parts are on record for KFN542-8. Try the cross-reference lookup to search by a different part number.
Catalog data updated 2026-07-05. Report a data error