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MS9491-20
Military Standard Bolt
Description
Fastener Length: 1-1/2", Thread: 5/16-24, Thread Length: 7/8"
Specifications
| Fastener Length | 1.490 inches minimum and 1.510 inches maximum |
|---|---|
| Features Provided | Finished head |
| Grip Length | 0.565 inches minimum and 0.625 inches maximum |
| Hardness Rating | 24.0 rockwell c minimum and 35.0 rockwell c maximum |
| Head Height | 0.188 |
| Head Style | Hexagon Head |
| Length | 1 1/2 |
| Material | Iron |
| Material Specification | Ams 5731 assn std single material response |
| Min. Tensile Strength (psi) | 130000 pounds per square inch |
| Minimum Yield Strength | 85000 pounds per square inch |
| Surface Finish | 32.0 microinches bearing surface of head, 32.0 microinches grip, 32.0 microinches threads |
| Thread Class | 3a |
| Thread Diameter | 0.312 |
| Thread Direction | Right-hand |
| Thread Length | 0.865 inches minimum and 0.945 inches maximum |
| Thread Qty | 24 |
| Thread Qty Per Inch (tpi) | 24 |
| Thread Series Designator | UNJF |
| Thread Size | 1/4 |
| Width Between Flats | 0.492 inches minimum and 0.502 inches maximum |
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.
- MS9453-20 MS 1/4-24 · 0.073 in · Hexagon Head · CRES
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Catalog data updated 2026-07-05. Report a data error