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ST3M506-4-4-1
Screw
Description
Fastener Length: 21/32", Thread: 1/4-28, Thread Length: 27/64"
Specifications
| Countersink Angle | 100.0 degrees |
|---|---|
| Fastener Length | 0.632 inches minimum and 0.662 inches maximum |
| Head Diameter | 0.421 inches minimum and 0.426 inches maximum |
| Head Style | Oval countersunk |
| Internal Drive Style | High-torque |
| Length | 21/32 |
| Material | Steel |
| Material Specification | Ams5629 assn std single material response |
| Shoulder Diameter | 0.249 inches minimum first shoulder and 0.2495 inches maximum first shoulder |
| Shoulder Length | 0.176 inches minimum first shoulder and 0.204 inches maximum first shoulder |
| Shoulder Shape | Round first shoulder |
| Special Features | Socket drive recess in thread end 0.095 inch nominal width across flats |
| Surface Treatment | Passivate |
| Surface Treatment Specification | Qq-p-35 fed spec single treatment response |
| Thread Class | 3a |
| Thread Diameter | 0.250 |
| Thread Direction | Right-hand |
| Thread Length | 0.372 inches minimum and 0.422 inches maximum |
| Thread Qty | 28 |
| Thread Qty Per Inch (tpi) | 28 |
| Thread Series Designator | UNC |
| Thread Size | 1/4 |
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.
- HT4016-4-4Y Other 1/4-28 · 21/32 in · Oval countersunk · Steel
- ST3M506-4-8-1 Other 1/4-28 · 21/32 in · Oval countersunk · Steel
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Catalog data updated 2026-07-05. Report a data error