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MS51957-79B
1/4-20X1/2 MS51957-B Phil Pan M/S Coarse Full Thread 300 Series S/S DFAR Black Ox
Description
Fastener Length: 1/2", Thread: 1/4-20, Thread Length: 1/2", black oxide
Specifications
| Diameter | 1/4 |
|---|---|
| Drive | Phillips |
| Drive Type | Phillips |
| Fastener Length | 0.468 inches minimum and 0.500 inches maximum |
| Finish | Black Oxide |
| Full Size | 1/4-20 x 1/2 |
| Head Diameter | 0.437 inches minimum and 0.492 inches maximum |
| Head Height | 0.162 inches minimum and 0.175 inches maximum |
| Head Style | Pan Head |
| Head Type | Pan |
| Internal Drive Style | Cross recess type 1 |
| Length | 1/2 |
| Material | CRES |
| MilspecPart | MS51957-B |
| Min. Tensile Strength (psi) | 80000 pounds per square inch |
| Nondefinitive Specification/Std Data | 3 type and 9c 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 | Oxide |
| Screw Surface Treatment Specification | Mil-c-13924,cl 4 mil spec single treatment response |
| Size | 1/4-20 |
| Thread Class | 2a |
| Thread Diameter | 0.250 |
| Thread Direction | Right-hand |
| Thread Length | 0.368 inches minimum and 0.500 inches maximum |
| Thread Qty | 20 |
| Thread Qty Per Inch (tpi) | 20 |
| Thread Series Designator | UNC |
| Thread Size | 1/4 |
| Thread Type | UNC |
| Threads Per Inch | 20 |
| U.O.M. | Imperial |
Cross-reference
No interchangeable or dimensionally similar parts are on record for MS51957-79B. Try the cross-reference lookup to search by a different part number.
Catalog data updated 2026-07-05. Report a data error