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MS21288-12
Military Standard Machine Bolt
Description
Length: 7/8", Hole Diameter: 3/64", Thread: 10-32, Thread Length: 5/8", drilled head, MS21288 series bolt
Specifications
| Extended Washer Diameter | 0.375 |
|---|---|
| Extended Washer Thickness | Between 0.04 inches and 0.05 inches |
| Fastener Length | 0.875 |
| Features Provided | Finished head |
| Grip Length | Between 0.19 inches and 0.25 inches |
| Hardness Rating | 248.0 brinell standard and 341.0 brinell standard |
| Head Height | 0.260 |
| Head Style | Double hexagon with hole |
| Hole Configuration Style | Round |
| Hole Diameter | 0.047 |
| Hole Quantity | 4 |
| Hole Type | Drilled |
| Length | 7/8 |
| Material | Iron |
| Material Specification | Ams 5732 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 threads, 63.0 microinches grip, 63.0 microinches surface of head |
| Thread Class | 3a |
| Thread Diameter | 0.190 |
| Thread Direction | Right-hand |
| Thread Length | Between 0.625 inches and 0.685 inches |
| Thread Qty | 32 |
| Thread Qty Per Inch (tpi) | 32 |
| Thread Series Designator | Unjf (fine thread with external controlled root radius) |
| Width Between Flats | Between 0.243 inches and 0.251 inches |
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 MS21288-12. Try the cross-reference lookup to search by a different part number.
Catalog data updated 2026-07-05. Report a data error