bolts › machine bolts
MS9558-20
Military Standard Machine Bolt
Description
Fastener Length: 1-1/2", Thread: 1/4-24, Thread Length: 59/64", MS9558 series bolt
Specifications
| Extended Washer Diameter | 0.500 |
|---|---|
| Extended Washer Thickness | 0.070 |
| Fastener Length | 1.500 |
| Features Provided | Finished head |
| Grip Length | Between 0.565 inches and 0.625 inches |
| Hardness Rating | 24.0 rockwell c and 35.0 rockwell c |
| Head Height | 0.348 |
| Head Style | Double hexagon w/hole |
| Length | 1 1/2 |
| Material | Iron |
| Material Specification | Ams 5731 assn standard 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 | Between 0.875 inches and 0.935 inches |
| Thread Qty | 24 |
| Thread Qty Per Inch (tpi) | 24 |
| Thread Series | UNJF |
| Thread Series Designator | Unjf (fine thread with external controlled root radius) |
| Thread Size | 1/4 |
| Width Between Flats | 0.375 |
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 MS9558-20. Try the cross-reference lookup to search by a different part number.
Catalog data updated 2026-07-05. Report a data error