screws › machine screws
MS21093-0410
Military Standard Machine Screw
Description
Fastener Length: 5/16", Thread: 4-40, Thread Length: 17/64
Specifications
| Countersink Angle | 99.0 degrees minimum and 101.0 degrees maximum |
|---|---|
| Fastener Length | 0.281 inches minimum and 0.312 inches maximum |
| Head Diameter | 0.200 inches minimum and 0.225 inches maximum |
| Head Height | 0.040 inches minimum and 0.048 inches maximum |
| Head Style | Flat countersunk |
| Internal Drive Style | Cross recess type 1 |
| Length | 5/16 |
| Locking Feature | Pellet or strip or patch |
| Material | Steel |
| Min. Tensile Strength (psi) | 60000 pounds per square inch |
| Screw Material | Steel |
| Screw Surface Treatment | Cadmium and chromate |
| Screw Surface Treatment Specification | Qq-p-416 ty 2 cl 3 fed spec single treatment response |
| Thread Class | 2a |
| Thread Diameter | 0.112 |
| Thread Direction | Right-hand |
| Thread Length | 0.264 inches minimum and 0.272 inches maximum |
| Thread Qty | 40 |
| Thread Qty Per Inch (tpi) | 40 |
| Thread Series Designator | UNC |
| Thread Size | 4 |
Other sizes
Parts that share this base number, ordered by size. Always verify the full specification before substituting.
Cross-reference
No interchangeable or dimensionally similar parts are on record for MS21093-0410. Try the cross-reference lookup to search by a different part number.
Catalog data updated 2026-07-05. Report a data error