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AN4H13
Aeronautical Standard Machine Bolt
Description
Fastener Length: 1-7/16", Hole Diameter: 1/32", Thread: 1/4-28, Thread Length: 1/2
Specifications
| Distance From Head Largest Bearing Surface To Shank Hole Center | 1.234 inches minimum first hole and 1.266 inches maximum first hole |
|---|---|
| Fastener Length | 1.391 inches minimum and 1.438 inches maximum |
| Features Provided | Finished head |
| Grip Length | 0.922 inches minimum and 0.953 inches maximum |
| Hardness Rating | 26.0 rockwell c minimum and 32.0 rockwell c maximum |
| Head Height | 0.140 inches minimum and 0.172 inches maximum |
| Head Style | Hexagon Head |
| Hole Configuration Style | Hexagon flats |
| Hole Diameter | 0.046 |
| Hole Quantity | 1 |
| Hole Type | Drilled |
| Length | 1 7/16 |
| Material | Steel |
| Material Specification | Mil-s-5626 mil spec 1st material response or mil-s-6049 mil spec 2nd material response or mil-s-6050 mil spec 3rd material response or mil-s-6098 mil spec 4th material response or mil-s-6758 mil spec 5th material response or ams 6300 assn std 6th material response |
| Min. Tensile Strength (psi) | 125000 pounds per square inch |
| Shank Unthreaded Hole Diameter | 0.076 inches minimum first hole and 0.086 inches maximum first hole |
| Surface Treatment | Cadmium and chromate |
| Surface Treatment Specification | Qq-p-416 ty 2 cl 3 fed spec all treatment responses |
| Thread Class | 3a |
| Thread Diameter | 0.250 |
| Thread Direction | Right-hand |
| Thread Length | 0.438 inches minimum and 0.515 inches maximum |
| 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 |
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.
- AN4CH13A AN 1/4-28 · 0.073 in · Hexagon Head · Steel
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Catalog data updated 2026-07-05. Report a data error