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MS51959-7
2-56X1/2 MS51959 NASM51959 Phil Flat Machine Screw Full Thread 300 Series S/S DFAR
Description
Fastener Length: 1/2", Thread: 2-56, Thread Length: 1/2", MS51959 series screw
Specifications
| Country of Origin | USA |
|---|---|
| Diameter | #2 |
| Drive | Phillips |
| Drive Type | Phillips |
| Fastener Length | 0.500 |
| Finish | Passivate per QQ-P-35, Plain |
| Full Size | #2-56 x 1/2 |
| Head Angle | 100 ? |
| Head Diameter | 0.155 inches minimum and 0.167 inches maximum |
| Head Height | 0.053 inches minimum and 0.062 inches maximum |
| Head Style | 82 Degree Flat Head, Pan Head, Phillips Flat Head |
| Head Type | Flat |
| Industry Standards/Certification | AN507 |
| Internal Drive Style | Cross recess type 1 |
| Length | 1/2 |
| Material | CRES |
| Milspec Part | MS51959 |
| MilspecPart | MS51959 |
| Min. Tensile Strength (psi) | 80 pounds per square inch |
| NIIN | 00-054-5641 |
| NSN | 5305-00-054-5641 |
| Screw Material | Steel comp 302 or steel comp 303 or steel comp 304 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 | 2-56 |
| Thread Class | 2a |
| Thread Diameter | 0.086 |
| Thread Direction | Right-hand |
| Thread Fraction | 2-56 |
| Thread Length | 0.464 inches minimum and 0.500 inches maximum |
| Thread Qty | 56 |
| Thread Qty Per Inch (tpi) | 56 |
| Thread Series Designator | UNC |
| Thread Size | 2 |
| Thread Type | N.C. - Coarse, UNC-2A |
| Threads Per Inch | 56 |
| U.O.M. | Imperial |
| Weight | .005 lb |
Cross-reference
Interchangeable
Parts that share a National Stock Number or are listed as an alternate for MS51959-7 — functionally equivalent.
- MS51957-7 Same NSN #2-56 · 1/2 in · Phillips Pan Head · CRES
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Catalog data updated 2026-07-05. Report a data error