screws › socket head cap screws
MS21295-25
Military Standard Socket Head Cap Screw
Description
Fastener Length: 29/64", Thread: 3/8-24, Head Width: 5/16", Thread Length: 29/64"
Specifications
| Departure From Cited Designator | As modified by self-locking feature |
|---|---|
| Fastener Length | 0.423 inches minimum and 0.453 inches maximum |
| Hardness Rating | 80.0 rockwell b |
| Head Diameter | 0.550 inches minimum and 0.562 inches maximum |
| Head Height | 0.368 inches minimum and 0.375 inches maximum |
| Head Style | Flat chamfer |
| Internal Drive Style | Hexagon |
| Length | 29/64 |
| Material | CRES |
| Material Specification | 66 fed std all material responses |
| Min. Tensile Strength (psi) | 80000 pounds per square inch |
| Minimum Yield Strength | 30000 pounds per square inch |
| Nondefinitive Specification/Std Data | 6 type |
| Surface Treatment | Passivate |
| Surface Treatment Specification | Qq-p-35 fed spec single treatment response |
| Thread Class | 3a |
| Thread Diameter | 0.375 |
| Thread Direction | Right-hand |
| Thread Length | 0.340 inches minimum and 0.453 inches maximum |
| Thread Qty | 24 |
| Thread Qty Per Inch (tpi) | 24 |
| Thread Series Designator | UNF |
| Thread Size | 3/8 |
| Width Across Flats | 0.313 inches minimum and 0.316 inches maximum |
Other sizes
Parts that share this base number, ordered by size. Always verify the full specification before substituting.
Cross-reference
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Catalog data updated 2026-07-05. Report a data error