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MS51959-89
1/4-20X2 1/2 MS51959 NASM51959 Phil Flat Machine Screw Full Thread 300 Series S/S DFAR
Description
MS 51959-89 Phillips Flat Head Machine Screw - 82 Degree
Specifications
| Countersink Angle | 80.0 degrees minimum and 82.0 degrees maximum |
|---|---|
| Diameter | 1/4 |
| Drive | Phillips |
| Drive Type | Phillips |
| Fastener Length | 2.406 inches minimum and 2.500 inches maximum |
| Finish | Passivate per QQ-P-35, Plain |
| Full Size | 1/4-20 x 2 1/2 |
| Head Diameter | 0.452 inches minimum and 0.507 inches maximum |
| Head Style | 82 Degree Flat Head, Flat countersunk, Phillips Flat Head |
| Head Type | Flat |
| Internal Drive Style | Cross recess type 1 |
| Length | 2 1/2 |
| Material | CRES |
| Milspec Part | MS51959 |
| MilspecPart | MS51959 |
| Min. Tensile Strength (psi) | 80000 pounds per square inch |
| Nondefinitive Specification/Std Data | 3 type and 2c style |
| Screw Material | Steel comp 301 or steel comp 302 or steel comp 302b or steel comp 303 or steel comp 303se or steel comp 304 or steel comp 304l or steel comp 305 or steel comp 308 or steel comp 309 or steel comp 309s or steel comp 310 or steel comp 310s or steel comp 314 or steel comp 316 or steel comp 316l or steel comp 317 or steel comp 321 or steel comp 347 or steel comp 348 or steel comp 384 or steel comp 385 |
| 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 | 1.750 inches minimum |
| Thread Qty Per Inch (tpi) | 20 |
| Thread Series Designator | UNC |
| Thread Type | N.C. - Coarse, UNC-2A |
| Threads Per Inch | 20 |
| U.O.M. | Imperial |
Cross-reference
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Catalog data updated 2026-07-05. Report a data error