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MS21090-0409
Military Standard Machine Screw
Description
Fastener Length: 3/16", Thread: 4-40, Thread Length: 3/16
Specifications
| Departure From Cited Designator | As modified by locking feature |
|---|---|
| Fastener Length | Between 0.157 inches and 0.188 inches |
| Head Diameter | Between 0.205 inches and 0.219 inches |
| Head Height | Between 0.070 inches and 0.080 inches |
| Head Style | Pan Head |
| Internal Drive Style | Cross recess type 1 |
| Length | 3/16 |
| Locking Feature | Pellet threads or strip threads |
| Material | CRES |
| Material Specification | Qq-s-637 federal specification all material responses or 66 federal standard all material responses |
| Nondefinitive Specification/Std Data | 3 type and 9c style |
| Surface Treatment | Cadmium and chromate |
| Surface Treatment Specification | Cl 3 federal specification all treatment responses type 2 qq-p-416 |
| Thread Class | 2a |
| Thread Diameter | 0.112 |
| Thread Direction | Right-hand |
| Thread Length | Between 0.107 inches and 0.188 inches |
| Thread Qty | 40 |
| Thread Qty Per Inch (tpi) | 40 |
| Thread Series | UNC |
| Thread Series Designator | Unc (coarse thread) |
| Thread Size | 4 |
Cross-reference
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Catalog data updated 2026-07-05. Report a data error