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MS18211-33C
Military Standard Screw
Description
Fastener Length: 15/32", Thread: 4-40, Thread Length: 3/8"
Specifications
| Countersink Angle | 99.0 degrees minimum and 101.0 degrees maximum |
|---|---|
| Fastener Length | 0.469 inches minimum and 0.500 inches maximum |
| Head Diameter | 0.191 inches minimum and 0.225 inches maximum |
| Head Style | Flat countersunk |
| Internal Drive Style | Slot |
| Length | 1/2 |
| Nondefinitive Specification/Std Data | 1 type and 3s style |
| Screw Material | Plastic polyhexamethylene amide |
| Screw Material Specification | Mil-m-20693,comp a,ty 1 mil spec single material response |
| Thread Class | 2a |
| Thread Diameter | 0.112 |
| Thread Direction | Right-hand |
| Thread Length | 0.370 inches minimum and 0.451 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
Similar parts
Parts with matching key dimensions — often from a different standards family. Candidates for comparison only; verify the full specification before substituting.
- NAS1102E04-8 NAS #4-40 · 1/2 in · Flat countersunk · Iron
- NAS1102E04-8P NAS #4-40 · 1/2 in · Flat countersunk · Iron
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Catalog data updated 2026-07-05. Report a data error