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MS51966-65
Military Standard Setscrew
Description
Fastener Length: 3/4", Thread: 1/4-28, Head Width: 1/8", Thread Length: 49/64"
Specifications
| Fastener Length | 0.735 inches minimum and 0.765 inches maximum |
|---|---|
| Hardness Rating | 45.0 rockwell c minimum and 53.0 rockwell c maximum |
| Head Style | Headless (setscrew) |
| Internal Drive Style | Hexagon |
| Length | 3/4 |
| Material | Steel |
| Material Specification | 66 fed std all material responses |
| Point Style | Flat |
| Surface Treatment | Cadmium and chromate |
| Surface Treatment Specification | Qq-p-416,type 2,class 3 fed spec all treatment responses |
| Thread Class | 3a |
| Thread Diameter | 0.250 |
| Thread Direction | Right-hand |
| Thread Length | 0.765 inches maximum |
| Thread Qty | 28 |
| Thread Qty Per Inch (tpi) | 28 |
| Thread Series Designator | UNF |
| Thread Size | 1/4 |
| Width Across Flats | 0.125 |
Other sizes
Parts that share this base number, ordered by size. Always verify the full specification before substituting.
- MS51966-48
- MS51966-50
- MS51966-65
- MS51966-114
- MS51966-121
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.
- AN565A428H12 AN 1/4-28 · 3/4 in · Headless (setscrew) · Steel
- AN565FC428H12 AN 1/4-28 · 3/4 in · Headless (setscrew) · CRES
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Catalog data updated 2026-07-05. Report a data error