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MS51966-123
Military Standard Screw
Description
Fastener Length: 5/16", Thread: 1/4-28, Head Width: 1/8", Thread Length: 5/16"
Specifications
| Fastener Length | 0.302 inches minimum and 0.322 inches maximum |
|---|---|
| Hardness Rating | 45.0 rockwell c minimum and 53.0 rockwell c maximum |
| Head Style | Headless (setscrew) |
| Internal Drive Style | Hexagon |
| Length | 5/16 |
| Locking Feature | Patch threads or pellet threads or strip threads |
| Material | Steel |
| Nondefinitive Specification/Std Data | 1 type and 1 style |
| Point Style | Flat |
| Surface Treatment | Cadmium and chromate |
| Surface Treatment Specification | Qq-p-416 ty2 cl3 fed spec single treatment response |
| Thread Class | 3a |
| Thread Diameter | 0.250 |
| Thread Direction | Right-hand |
| Thread Length | 0.302 inches minimum and 0.322 inches maximum |
| Thread Qty | 28 |
| Thread Qty Per Inch (tpi) | 28 |
| Thread Series Designator | UNF |
| Thread Size | 1/4 |
| Width Across Flats | 0.125 |
Other sizes
Parts that share this base number, ordered by size. Always verify the full specification before substituting.
Cross-reference
Similar parts
Parts with matching key dimensions — often from a different standards family. Candidates for comparison only; verify the full specification before substituting.
- MS51023-62 MS 1/4-28 · 5/16 in · Headless (setscrew) · CRES
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Catalog data updated 2026-07-05. Report a data error