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AN4-3
Bolt - Drilled
Description
Airframe Bolt; Drilled
Specifications
| Country of Origin | USA |
|---|---|
| Distance From Head Largest Bearing Surface To Shank Hole Center | 0.374 inches first hole |
| Drilling | Drilled Head |
| Fastener Length | 0.469 |
| Features Provided | Finished head |
| Grip | 1/16 in |
| Grip Length | 0.062, 1/16 |
| Hardness Rating | 26.0 rockwell c and 32.0 rockwell c |
| Head Height | Between 0.140 inches and 0.172 inches |
| Head Style | Hexagon Head |
| Head Type | Hexagon |
| Industry Standards/Certification | AN4 |
| Length | 15/32 in |
| Material | Steel |
| Material Specification | Mil-b-6812 military specification all material responses |
| Min. Tensile Strength (psi) | 125000 pounds per square inch |
| NIIN | 00-174-4111 |
| NSN | 5306-00-174-4111 |
| Nominal Length | 15/32 |
| Shank Unthreaded Hole Diameter | 0.076 inches first hole |
| 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 | 0.250 |
| Thread Direction | Right-hand |
| Thread Length | 0.407 |
| Thread Qty | 28 |
| Thread Qty Per Inch (tpi) | 28 |
| Thread Series | UNF |
| Thread Series Designator | Unf (fine thread) |
| Thread Size | 1/4-28 |
| Weight | 0.01 lb |
| Width Between Flats | Between 0.428 inches and 0.440 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.
- AN4C3A AN 1/4-28 · 15/32 in · Hexagon Head · Steel
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Catalog data updated 2026-07-05. Report a data error