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AN6-21
Aeronautical Standard Machine Bolt
Description
Airframe Bolt, Drilled
Specifications
| Country of Origin | USA |
|---|---|
| Distance From Head Largest Bearing Surface To Shank Hole Center | 2.000 inches first hole |
| Drilling | Drilled Head |
| Fastener Length | 2.203 |
| Features Provided | Finished head |
| Grip | 1 9/16 in |
| Grip Length | 1 9/16, 1.562 |
| Hardness Rating | 26.0 rockwell c and 32.0 rockwell c |
| Head Height | Between 0.203 inches and 0.235 inches |
| Head Style | Hexagon Head |
| Head Type | Hexagon |
| Industry Standards/Certification | AN6 |
| Length | 2 13/64 in |
| Material | Steel |
| Material Specification | Mil-s-5626 military specification 1st material response or mil-6049 military specification 2nd material response or mil-s-6050 military specification 3rd material response or mill-s-6098 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 |
| NIIN | 00-167-3687 |
| NSN | 5306-00-167-3687 |
| Nominal Length | 2 7/32 |
| Shank Unthreaded Hole Diameter | 0.106 inches first hole |
| Surface Treatment | Cadmium and chromate |
| Surface Treatment Specification | Class 3 federal specification all treatment responses type 2 qq-p-416 |
| Thread Class | 3a |
| Thread Diameter | 0.375 |
| Thread Direction | Right-hand |
| Thread Length | 0.641 |
| Thread Qty | 24 |
| Thread Qty Per Inch (tpi) | 24 |
| Thread Series | UNF |
| Thread Series Designator | Unf (fine thread) |
| Thread Size | 3/8-24 |
| Weight | 0.08 lb |
| Width Between Flats | Between 0.553 inches and 0.565 inches |
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.
- AN6-21A AN 3/8-24 · 0.086 in · Hexagon Head · Steel
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Catalog data updated 2026-07-05. Report a data error