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AN177-37
Aeronautical Standard Close Tolerance Bolt
Description
Close Tolerance Bolt
Specifications
| Country of Origin | USA |
|---|---|
| Fastener Length | 3.969 |
| Grip | 3 5/16 in |
| Grip Diameter | Between 0.4362 inches and 0.4367 inches |
| Grip Length | 3.312 |
| Hardness Rating | 26.0 rockwell c and 32.0 rockwell c |
| Head Height | Between 0.234 inches and 0.266 inches |
| Head Style | Hexagon Head |
| Head Type | Hexagon |
| Industry Standards/Certification | AN177 |
| Length | 3 15/16 in |
| Material | Steel |
| Material Specification | Mil-s-6049 military specification 1st material response or mil-s-6050 military specification 2nd material response or mil-s-6098 military specification 3rd material response or mil-s-5626 military specification 4th material response or mil-s-6758 military specification 5th material response or ams 6300 assn standard 6th material response |
| Min. Tensile Strength (psi) | 125000 pounds per square inch |
| Shank Unthreaded Hole Diameter | 0.106 inches first hole |
| Surface Finish | 63.0 microinches grip, 63.0 microinches surface of head |
| Surface Treatment | Cadmium and chromate |
| Surface Treatment Specification | Qq-p-416 type 2 class 3 federal specification all treatment responses |
| Thread Class | 3a |
| Thread Diameter | 0.437 |
| Thread Direction | Right-hand |
| Thread Length | 0.657 |
| Thread Qty | 20 |
| Thread Qty Per Inch (tpi) | 20 |
| Thread Series Designator | Unf (fine thread) |
| Thread Size | 3/8 |
| Weight | 0.19 lb |
| Width Between Flats | Between 0.615 inches and 0.627 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 AN177-37. Try the cross-reference lookup to search by a different part number.
Catalog data updated 2026-07-05. Report a data error