screws › socket head cap screws
MS21090-0416
Military Standard Screwlock
Description
Fastener Length: 3/4", Thread: 4-40, Thread Length: 3/4"
Specifications
| Fastener Length | 0.719 inches minimum and 0.750 inches maximum |
|---|---|
| Hardness Rating | 26.0 rockwell c minimum and 32.0 rockwell c maximum |
| Head Diameter | 0.205 inches minimum and 0.219 inches maximum |
| Head Height | 0.070 inches minimum and 0.080 inches maximum |
| Head Style | Pan Head |
| Internal Drive Style | Cross recess type 1 |
| Length | 3/4 |
| Locking Feature | Patch threads or pellet threads or strip threads |
| Material | Steel |
| Material Specification | Ams 6300 assn std 1st material response or mil-s-6050 mil spec 2nd material response |
| Surface Treatment | Cadmium and chromate |
| Surface Treatment Specification | Qq-p-416,type 2,class 3 fed spec single treatment response |
| Thread Class | 2a |
| Thread Diameter | 0.112 |
| Thread Direction | Right-hand |
| Thread Length | 0.719 inches minimum and 0.750 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.
- MS21090-0415
- MS21090-0416
- MS21090-0417
- MS21090-0632
- MS21090-689
- MS21090-0840
- MS21090-0841
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.
- NAS1635-04-12 NAS #4-40 · 3/4 in · Pan Head · CRES
Looking for a specific part? Use the cross-reference lookup.
Catalog data updated 2026-07-05. Report a data error