bolts › close tolerance bolts
AN177-40A
Aeronautical Standard Bolt
Description
Fastener Length: 4-3/32", Thread: 3/8-20, Thread Length: 5/8"
Specifications
| Fastener Length | 4.094 |
|---|---|
| Grip Diameter | 0.4362 inches minimum and 0.4367 inches maximum |
| Grip Length | 3.438 |
| Head Height | 0.234 inches minimum and 0.266 inches maximum |
| Head Style | Hexagon Head |
| Length | 4 3/32 |
| Material | Steel |
| Min. Tensile Strength (psi) | 125000 pounds per square inch |
| Surface Finish | 63.0 microinches bearing surface of head, 63.0 microinches grip |
| Surface Treatment | Cadmium and chromate |
| Surface Treatment Specification | Qq-p-416 ty 2 cl 3 fed spec single treatment response |
| Thread Class | 3a |
| Thread Diameter | 0.437 |
| Thread Direction | Right-hand |
| Thread Length | 0.656 inches minimum |
| Thread Qty | 20 |
| Thread Qty Per Inch (tpi) | 20 |
| Thread Series Designator | UNF |
| Thread Size | 3/8 |
| Width Between Flats | 0.615 inches minimum and 0.627 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 AN177-40A. Try the cross-reference lookup to search by a different part number.
Catalog data updated 2026-07-05. Report a data error