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MS16997-99L
Military Standard Screw
Description
Fastener Length: 0-63/64", Thread: 3/8-16, Head Width: 5/16", Thread Length: 0-63/64"
Specifications
| Fastener Length | 0.969 inches minimum and 1.000 inches maximum |
|---|---|
| Hardness Rating | 38.0 rockwell c minimum and 45.0 rockwell c maximum |
| Head Diameter | 0.550 inches minimum and 0.562 inches maximum |
| Head Height | 0.368 inches minimum and 0.375 inches maximum |
| Head Style | Flat chamfer |
| Internal Drive Style | Hexagon |
| Length | 0 63/64 |
| Locking Feature | Patch threads or strip threads |
| Material | Steel |
| Min. Tensile Strength (psi) | 170000 pounds per square inch |
| Minimum Yield Strength | 150000 pounds per square inch |
| Nondefinitive Specification/Std Data | 6 type |
| Surface Treatment | Cadmium and chromate |
| Surface Treatment Specification | Qq-p-416 ty2,cl3 fed spec single treatment response |
| Thread Class | 3a |
| Thread Diameter | 0.375 |
| Thread Direction | Right-hand |
| Thread Length | 0.844 inches minimum and 1.000 inches maximum |
| Thread Qty | 16 |
| Thread Qty Per Inch (tpi) | 16 |
| Thread Series Designator | UNC |
| Thread Size | 3/8 |
| Width Across Flats | 0.312 inches minimum and 0.316 inches maximum |
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.
- 91251A624 Commercial 3/8-16 · 1/16 in · Flat chamfer · Steel
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Catalog data updated 2026-07-05. Report a data error