bolts › machine bolts
ST3M571-5D21
Bolt
Description
Fastener Length: 1-7/8", Thread: 1/4-24, Thread Length: 37/64"
Specifications
| Distance From Head Largest Bearing Surface To Shank Hole Center | 1.630 inches minimum first hole and 1.690 inches maximum first hole |
|---|---|
| Extended Washer Diameter | 0.521 inches minimum and 0.531 inches maximum |
| Extended Washer Thickness | 0.072 inches minimum and 0.092 inches maximum |
| Fastener Length | 1.838 inches minimum and 1.888 inches maximum |
| Grip Diameter | 0.3115 inches minimum and 0.3120 inches maximum |
| Grip Length | 1.302 inches minimum and 1.322 inches maximum |
| Head Height | 0.338 inches minimum and 0.358 inches maximum |
| Head Style | Double hexagon w/hole |
| Length | 1 7/8 |
| Material | Steel |
| Min. Tensile Strength (psi) | 220000 pounds per square inch |
| Shank Unthreaded Hole Diameter | 0.076 inches minimum first hole and 0.081 inches maximum first hole |
| Surface Treatment | Passivate |
| Thread Class | 3a |
| Thread Diameter | 0.312 |
| Thread Direction | Right-hand |
| Thread Length | 0.516 inches minimum and 0.586 inches maximum |
| Thread Qty | 24 |
| Thread Qty Per Inch (tpi) | 24 |
| Thread Series Designator | UNJF |
| Thread Size | 1/4 |
| Width Between Flats | 0.367 inches minimum and 0.376 inches maximum |
Other sizes
Parts that share this base number, ordered by size. Always verify the full specification before substituting.
- ST3M571-5D21
- ST3M571-5D37
Cross-reference
No interchangeable or dimensionally similar parts are on record for ST3M571-5D21. Try the cross-reference lookup to search by a different part number.
Catalog data updated 2026-07-05. Report a data error