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MS21093-0831
Military Standard Screw
Description
Fastener Length: 5/16", Thread: 8-32, Thread Length: 1/4"
Specifications
| Countersink Angle | 99.0 degrees minimum and 101.0 degrees maximum |
|---|---|
| Departure From Cited Designator | As modified by locking feature |
| Fastener Length | 0.281 inches minimum and 0.312 inches maximum |
| Head Diameter | 0.300 inches minimum and 0.332 inches maximum |
| Head Style | Flat countersunk |
| Internal Drive Style | Cross recess type 1 |
| Length | 5/16 |
| Locking Feature | Patch or strip |
| Material | Steel |
| Min. Tensile Strength (psi) | 60000 pounds per square inch |
| Nondefinitive Specification/Std Data | 3 type and 3c style |
| 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 | 0.164 |
| Thread Direction | Right-hand |
| Thread Length | 0.147 inches minimum and 0.250 inches maximum |
| Thread Qty | 32 |
| Thread Qty Per Inch (tpi) | 32 |
| Thread Series Designator | UNC |
| Thread Size | 8 |
Other sizes
Parts that share this base number, ordered by size. Always verify the full specification before substituting.
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.
- NAS1219-08-5 NAS #8-32 · 5/16 in · Flat countersunk · Steel
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Catalog data updated 2026-07-05. Report a data error