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AN531-4R4
Aeronautical Standard Screw
Description
Fastener Length: 1/4"
Specifications
| Countersink Angle | 80.0 degrees minimum and 82.0 degrees maximum |
|---|---|
| Fastener Length | 0.250 |
| Head Diameter | 0.216 inches minimum and 0.225 inches maximum |
| Head Style | Flat countersunk |
| Internal Drive Style | Cross recess type 1 |
| Length | 1/4 |
| Material | Steel |
| Material Specification | Qq-s-685 cond n fed spec single material response |
| Nonmachine Thread Diameter | 0.112 |
| Nonmachine Thread Style | Dog type (type b or c) |
| Surface Treatment | Cadmium or zinc |
Other sizes
Parts that share this base number, ordered by size. Always verify the full specification before substituting.
- AN531-4R4
- AN531-4R10
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.
- MS35492-208 MS 1/4 in · Flat countersunk · Copper
- MS35492-8 MS 1/4 in · Flat countersunk · Steel
- AN531-4-4 AN 1/4 in · Flat countersunk · Steel
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Catalog data updated 2026-07-05. Report a data error