bolts › machine bolts
NK4-6A
Bolt
Description
Fastener Length: 13/16", Thread: 1/4-28, Thread Length: 33/64"
Specifications
| Fastener Length | 0.765 inches minimum and 0.812 inches maximum |
|---|---|
| Features Provided | Finished head |
| Grip Length | 0.296 inches minimum and 0.328 inches maximum |
| Head Height | 0.140 inches minimum and 0.172 inches maximum |
| Head Style | Hexagon Head |
| Length | 13/16 |
| Locking Feature | Pellet threads |
| Material | Plastic |
| Material Specification | Mil-s-5626 mil spec 1st material response fastener or mil-s-6049 mil spec 2nd material response fastener or mil-s-6050 mil spec 3rd material response fastener or mil-s-6098 mil spec 4th material response fastener or mil-s-6758 mil spec 5th material response fastener |
| Surface Treatment | Cadmium and chromate |
| Surface Treatment Specification | Qq-p-416 ty 2 cl 2 fed spec single treatment response fastener |
| Thread Class | 3a |
| Thread Diameter | 0.250 |
| Thread Direction | Right-hand |
| Thread Length | 0.437 inches minimum and 0.516 inches maximum |
| Thread Qty | 28 |
| Thread Qty Per Inch (tpi) | 28 |
| Thread Series Designator | UNF |
| Thread Size | 1/4 |
| Width Between Flats | 0.428 inches minimum and 0.440 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 NK4-6A. Try the cross-reference lookup to search by a different part number.
Catalog data updated 2026-07-05. Report a data error