bolts › machine bolts
MS9559-18
Military Standard Machine Bolt
Description
Length: 1-1/4", Thread: 8-36, Thread Length: 43/64", MS9559 series bolt
Specifications
| Bearing Surface Of Head Surface Finish | 32.0 microinches |
|---|---|
| Extended Washer Diameter | 0.312 |
| Extended Washer Thickness | 0.030 inches minimum |
| Fastener Length | 1.250 |
| Head Height | 0.230 |
| Head Style | Double hexagon w/ hole |
| Internal Drive Style | W/o internal drive |
| Length | 1 1/4 |
| Material | Iron |
| Screw Material | Iron alloy 660 |
| Screw Material Specification | Ams5731 assn std single material response |
| Thread Class | 3a |
| Thread Diameter | 0.164 |
| Thread Direction | Right-hand |
| Thread Length | 0.638 inches minimum and 0.678 inches maximum |
| Thread Qty | 36 |
| Thread Qty Per Inch (tpi) | 36 |
| Thread Series Designator | UNJF |
| Thread Size | 8 |
| Thread Surface Finish | 32.0 microinches |
| Width Between Flats | 0.2188 |
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 MS9559-18. Try the cross-reference lookup to search by a different part number.
Catalog data updated 2026-07-05. Report a data error