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MS51959-78
1/4-20X7/16 MS51959 NASM51959 Phil Flat Machine Screw Full Thread 300 Series S/S DFAR
Description
MS 51959-78 Phillips Flat Head Machine Screw - 82 Degree
Specifications
| Countersink Angle | 80.0 degrees minimum and 82.0 degrees maximum |
|---|---|
| Drive | Phillips |
| Fastener Length | 0.438 |
| Finish | Passivate per QQ-P-35, Plain |
| Head Diameter | 0.452 inches minimum and 0.507 inches maximum |
| Head Height | 0.092 inches minimum and 0.107 inches maximum |
| Head Style | 82 Degree Flat Head, Flat countersunk undercut, Phillips Flat Head |
| Internal Drive Style | Cross recess type 1 |
| Length | 7/16 |
| Material | CRES |
| Milspec Part | MS51959 |
| Min. Tensile Strength (psi) | 80000 pounds per square inch |
| Screw Material | Steel comp 302 or steel comp 303 or steel comp 304 or steel comp 305 or steel comp 316 |
| Screw Material Specification | 66 fed std all material responses |
| Screw Surface Treatment | Passivate |
| Screw Surface Treatment Specification | Qq-p-35 fed spec single treatment response |
| Size | 1/4-20 |
| Thread Class | 2a |
| Thread Diameter | 0.250 |
| Thread Direction | Right-hand |
| Thread Fraction | 1/4-20 |
| Thread Length | 0.338 inches minimum and 0.438 inches maximum |
| Thread Qty Per Inch (tpi) | 20 |
| Thread Series Designator | UNC |
| Thread Type | N.C. - Coarse, UNC-2A |
Cross-reference
No interchangeable or dimensionally similar parts are on record for MS51959-78. Try the cross-reference lookup to search by a different part number.
Catalog data updated 2026-07-05. Report a data error