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MS21262-56
Military Standard Screw
Description
Fastener Length: 0-63/64", Thread: 1/4-28, Head Width: 3/16", Thread Length: 0-63/64"
Specifications
| Fastener Length | 0.985 inches minimum and 1.031 inches maximum |
|---|---|
| Hardness Rating | 36.0 rockwell c minimum and 45.0 rockwell c maximum |
| Head Diameter | 0.365 inches minimum and 0.375 inches maximum |
| Head Height | 0.244 inches minimum and 0.250 inches maximum |
| Head Style | Flat chamfer |
| Internal Drive Style | Hexagon |
| Length | 0 63/64 |
| Locking Feature | Pellet threads or strip threads |
| Material | Steel |
| Material Specification | 66 fed std single material response |
| Min. Tensile Strength (psi) | 160000 pounds per square inch |
| Minimum Yield Strength | 130000 pounds per square inch |
| Surface Treatment | Cadmium and chromate |
| Surface Treatment Specification | Qq-p-416 ty 2 cl 3 fed spec single treatment response |
| Thread Class | 3a |
| Thread Diameter | 0.250 |
| Thread Direction | Right-hand |
| Thread Length | 0.914 inches minimum and 1.031 inches maximum |
| Thread Qty | 28 |
| Thread Qty Per Inch (tpi) | 28 |
| Thread Series Designator | UNF |
| Thread Size | 1/4 |
| Width Across Flats | 0.188 inches minimum and 0.190 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 MS21262-56. Try the cross-reference lookup to search by a different part number.
Catalog data updated 2026-07-05. Report a data error