screws › machine screws
MS21090-0411
Military Standard Machine Screw
Description
Fastener Length: 5/16", Thread: 4-40, Thread Length: 5/16"
Specifications
| Departure From Cited Designator | As modified by locking feature |
|---|---|
| Fastener Length | Between 0.281 inches and 0.312 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 | 5/16 |
| Material | Steel |
| Material Specification | Qq-s-637 federal specification single material response |
| Nondefinitive Specification/Std Data | 3 type or 3c 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 0.231 inches and 0.312 inches |
| Thread Qty | 40 |
| Thread Qty Per Inch (tpi) | 40 |
| Thread Series | UNC |
| Thread Series Designator | Unc (coarse thread) |
| Thread Size | 4 |
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.
- AN515-4R5 AN #4-40 · 5/16 in · Pan Head · Steel
- NAS1100E04-5 NAS #4-40 · 5/16 in · Pan Head · Iron
- NAS1190-04P5B NAS #4-40 · 5/16 in · Pan Head · Steel
- NAS1190-04P5N NAS #4-40 · 5/16 in · Pan Head · Steel
- NAS600-5P NAS #4-40 · 5/16 in · Pan Head · Steel
- MS51957-14B MS #4-40 · 5/16 in · Pan Head · CRES
Looking for a specific part? Use the cross-reference lookup.
Catalog data updated 2026-07-05. Report a data error