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AN4DD4A
Aeronautical Standard Bolt
Description
Fastener Length: 17/32", Thread: 1/4-28, Thread Length: 15/32"
Specifications
| Fastener Length | 0.531 |
|---|---|
| Features Provided | Finished head |
| Grip Length | 0.062 |
| Head Height | 0.140 inches minimum and 0.172 inches maximum |
| Head Style | Hexagon Head |
| Length | 1/2 |
| Material | Aluminum |
| Material Specification | Qq-a-267 fed spec 1st material response or qq-a-268 fed spec 1st material response or mil-w-7986 mil spec 2nd material response |
| Min. Tensile Strength (psi) | 62000 pounds per square inch |
| Surface Treatment | Oxide film and anodize |
| Surface Treatment Specification | Mil-c-5541 mil spec 1st treatment response and mil-a-8625 mil spec 2nd treatment response |
| Thread Class | 3a |
| Thread Diameter | 0.250 |
| Thread Direction | Right-hand |
| Thread Length | 0.469 inches minimum |
| Thread Qty | 28 |
| Thread Qty Per Inch (tpi) | 28 |
| Thread Series Designator | UNF |
| Thread Size | 1/4 |
| Width Between Flats | 0.428 inches minimum and 0.440 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 AN4DD4A. Try the cross-reference lookup to search by a different part number.
Catalog data updated 2026-07-05. Report a data error