bolts › machine bolts
MS20034-6
Military Standard Machine Bolt
Description
Fastener Length: 1-19/64", Thread: 1/4-28, Thread Length: 9/16"
Specifications
| Country of Origin | USA |
|---|---|
| Fastener Length | 1.250 inches minimum and 1.297 inches maximum |
| Features Provided | Finished head |
| Grip Length | 0.734 inches minimum and 0.766 inches maximum |
| Hardness Rating | 27.0 rockwell c minimum and 37.0 rockwell c maximum |
| Head Height | 0.140 inches minimum and 0.172 inches maximum |
| Head Style | Hexagon Head |
| Length | 1 19/64 |
| Material | Steel |
| Surface Finish | 32.0 microinches threads, 63.0 microinches bearing surface of head, 63.0 microinches grip |
| Thread Class | 3a |
| Thread Diameter | 0.250 |
| Thread Direction | Right-hand |
| Thread Length | 0.484 inches minimum and 0.563 inches maximum |
| Thread Qty | 28 |
| Thread Qty Per Inch (tpi) | 28 |
| Thread Series Designator | UNJF |
| Thread Size | 1/4 |
| Weight | .005 lb |
| Width Between Flats | 0.428 inches minimum and 0.440 inches maximum |
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 MS20034-6. Try the cross-reference lookup to search by a different part number.
Catalog data updated 2026-07-05. Report a data error