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AN6-40A
Aeronautical Standard Machine Bolt
Description
Airframe Bolt
Specifications
| Country of Origin | USA |
|---|---|
| Drilling | Undrilled Head |
| Fastener Length | 4.078 |
| Features Provided | Finished head |
| Grip | 3 7/16 in |
| Grip Length | 3 7/16, 3.438 |
| Hardness Rating | 26.0 rockwell c minimum and 32.0 rockwell c maximum |
| Head Height | 0.203 inches minimum and 0.235 inches maximum |
| Head Style | Hexagon Head |
| Head Type | Hexagon |
| Industry Standards/Certification | AN6 |
| Length | 4 1/16, 4 5/64 in |
| Material | Steel |
| Material Specification | Mil-b-6812 mil spec all material responses |
| Min. Tensile Strength (psi) | 125000 pounds per square inch |
| NIIN | 00-275-9561 |
| NSN | 5306-00-275-9561 |
| Nominal Length | 4 3/32 |
| Surface Treatment | Cadmium and chromate |
| Surface Treatment Specification | Qq-p-416,type 2,class 3 fed spec single treatment response |
| Thread Class | 3a |
| Thread Diameter | 0.375 |
| Thread Direction | Right-hand |
| Thread Length | 0.640 inches minimum |
| Thread Qty | 24 |
| Thread Qty Per Inch (tpi) | 24 |
| Thread Series Designator | UNF |
| Thread Size | 3/8-24 |
| Weight | .14 lb |
| Width Between Flats | 0.553 inches minimum and 0.565 inches maximum |
Cross-reference
Similar parts
Parts with matching key dimensions — often from a different standards family. Candidates for comparison only; verify the full specification before substituting.
- AN6-40 AN 3/8-24 · 7/64 in · Hexagon Head · Steel
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Catalog data updated 2026-07-05. Report a data error