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MS51959-99
5/16-18X1 1/4 MS51959 NASM51959 Phil Flat Machine Screw Full Thread 300 Series S/S DFAR
Description
MS 51959-99 Phillips Flat Head Machine Screw - 82 Degree
Specifications
| Countersink Angle | Between 80.0 degrees and 82.0 degrees |
|---|---|
| Diameter | 5/16 |
| Drive | Phillips |
| Drive Type | Phillips |
| Fastener Length | 1.250 |
| Finish | Passivate per QQ-P-35, Plain |
| Full Size | 5/16-18 x 1 1/4 |
| Head Diameter | Between 0.568 inches and 0.635 inches |
| Head Style | 82 Degree Flat Head, Flat countersunk, Phillips Flat Head |
| Head Type | Flat |
| Internal Drive Style | Cross recess type 1 |
| Length | 1 1/4, 1 1/8 |
| Material | CRES |
| Material Specification | 66 federal standard all material responses |
| Milspec Part | MS51959 |
| MilspecPart | MS51959 |
| Min. Tensile Strength (psi) | 80000 pounds per square inch |
| Size | 5/16-18 |
| Surface Treatment | Passivate |
| Surface Treatment Specification | Qq-p-35 federal specification single treatment response |
| Thread Class | 2a |
| Thread Diameter | 0.312 |
| Thread Direction | Right-hand |
| Thread Fraction | 5/16-18 |
| Thread Length | Between 1.131 inches and 1.250 inches |
| Thread Qty Per Inch (tpi) | 18 |
| Thread Series | UNC |
| Thread Series Designator | Unc (coarse thread) |
| Thread Type | N.C. - Coarse, UNC-2A |
| Threads Per Inch | 18 |
| U.O.M. | Imperial |
Cross-reference
No interchangeable or dimensionally similar parts are on record for MS51959-99. Try the cross-reference lookup to search by a different part number.
Catalog data updated 2026-07-05. Report a data error