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KFN542-4
Locking Assembled Washer Nut Self
Description
Thread Size: 1/4", Head Width: 1/4", locknut, KFN542 series nut
Specifications
| Counterbore Diameter | 0.283 inches nut and 0.288 inches nut |
|---|---|
| Hardness Rating | Between 39.0 rockwell c and 43.0 rockwell c |
| Locking Feature | Prevailing torque all metal design |
| Material | Steel |
| Material Specification | Mil-s-5000 military specification 1st material response nut or mil-s-5626 military specification 2nd material response nut or mil-s-6049 military specification 3rd material response nut |
| Nut Counterbore Depth | 0.087 inches nut and 0.097 inches nut |
| Nut Style | Flat with turned up edge |
| Overall Height | 0.280 |
| Special Features | Washer rockwell c scale 40.0 min and 45.0 max |
| Surface Treatment | Cadmium and chromate |
| Surface Treatment Specification | Cl 2 federal specification single treatment response type 2 qq-p-416 |
| Temperature Rating | 450.0 degrees fahrenheit |
| Thread Class | 3b |
| Thread Direction | Right-hand |
| Thread Qty | 28 |
| Thread Qty Per Inch (tpi) | 28 |
| Thread Series | Unjf (fine thread with external controlled root radius) |
| Thread Size | 0.250 |
| Washer Outside Diameter | 0.460 |
| Width Across Flats | Between 0.306 inches and 0.313 inches |
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 KFN542-4. Try the cross-reference lookup to search by a different part number.
Catalog data updated 2026-07-05. Report a data error