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MS9566-21
Military Standard Machine Bolt
Description
Fastener Length: 1-7/16", Hole Diameter: 1/16", Thread: 1/4-28, Thread Length: 13/16", MS9566 series bolt
Specifications
| Extended Washer Diameter | Between 0.428 inches and 0.448 inches |
|---|---|
| Extended Washer Thickness | 0.060 |
| Fastener Length | Between 1.428 inches and 1.448 inches |
| Features Provided | Finished head |
| Grip Length | Between 0.628 inches and 0.688 inches |
| Hardness Rating | 24.0 rockwell c and 35.0 rockwell c |
| Head Height | Between 0.290 inches and 0.310 inches |
| Head Style | Double hexagon w/hole |
| Hole Configuration Style | Double hexagon longitudinal hole |
| Hole Diameter | 0.070 |
| Hole Quantity | 4 |
| Hole Type | Drilled |
| 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 | 0.250 |
| Thread Direction | Right-hand |
| Thread Length | Between 0.740 inches and 0.820 inches |
| Thread Qty | 28 |
| Thread Qty Per Inch (tpi) | 28 |
| Thread Series | UNJF |
| Thread Series Designator | Unjf (fine thread with external controlled root radius) |
| Thread Size | 1/4 |
| Width Between Flats | Between 0.302 inches and 0.322 inches |
Cross-reference
No interchangeable or dimensionally similar parts are on record for MS9566-21. Try the cross-reference lookup to search by a different part number.
Catalog data updated 2026-07-05. Report a data error