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AN565A428H16
Aeronautical Standard Machine Screw
Description
Fastener Length: 0-63/64", Thread: 1/4-28, Head Width: 1/8", Thread Length: 0-63/64
Specifications
| Fastener Length | 0.985 inches minimum and 1.015 inches maximum |
|---|---|
| Hardness Rating | 45.0 rockwell c minimum and 53.0 rockwell c maximum |
| Head Style | Headless (setscrew) |
| Internal Drive Style | Hexagon |
| Length | 0 63/64 |
| Material | Steel |
| Material Specification | 66 fed std all material responses |
| Point Style | Flat |
| Surface Treatment | Cadmium and chromate |
| Surface Treatment Specification | Qq-p-416,type 2,class 3 fed spec all treatment responses |
| Thread Class | 3a |
| Thread Diameter | 0.250 |
| Thread Direction | Right-hand |
| Thread Length | 0.985 inches minimum and 1.015 inches maximum |
| Thread Qty | 28 |
| Thread Qty Per Inch (tpi) | 28 |
| Thread Series Designator | UNF |
| Thread Size | 1/4 |
| Width Across Flats | 0.125 |
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.
- MS51966-67 MS 1/4-28 · 1/16 in · Headless (setscrew) · Steel
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Catalog data updated 2026-07-05. Report a data error