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ST3M506-4-9-1
Screw
Description
Fastener Length: 63/64", Thread: 1/4-28, Thread Length: 27/64"
Specifications
| Countersink Angle | 99.0 degrees minimum and 101.0 degrees maximum |
|---|---|
| Fastener Length | 0.954 inches minimum and 0.984 inches maximum |
| Head Diameter | 0.421 inches minimum and 0.426 inches maximum |
| Head Style | Oval countersunk |
| Internal Drive Style | High-torque |
| Length | 63/64 |
| Material | Steel |
| Material Specification | Ams5629 assn std single material response |
| Shoulder Diameter | 0.2802 inches minimum first shoulder and 0.2807 inches maximum first shoulder |
| Shoulder Length | 0.488 inches minimum first shoulder and 0.516 inches maximum first shoulder |
| Shoulder Shape | Round first shoulder |
| Special Features | Socket drive recess in thread end 0.0947 in. min and 0.0967 in. max 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 | UNJF |
| 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.
- HT4016-4-9Y Other 1/4-28 · 31/32 in · Oval countersunk · Steel
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Catalog data updated 2026-07-05. Report a data error