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MS51957-20B
4-40X7/8 MS51957-B Phil Pan M/S Coarse Full Thread 300 Series S/S DFAR Black Ox
Description
Pan Head Machine Screw
Specifications
| Color | Black |
|---|---|
| Country of Origin | USA |
| Diameter | #4 |
| Drive | Phillips |
| Drive Style | Phillips |
| Drive Type | Phillips |
| Fastener Length | 0.844 inches minimum and 0.875 inches maximum |
| Finish | Black Oxide Coating |
| Full Size | #4-40 x 7/8 |
| Head Angle | 100 ? |
| Head Diameter | 0.205 inches minimum and 0.219 inches maximum |
| Head Height | 0.070 inches minimum and 0.080 inches maximum |
| Head Style | Pan Head |
| Head Type | Pan |
| Industry Standards/Certification | MS51957 |
| Internal Drive Style | Cross recess type 1 |
| Length | 7/8 in |
| Material | CRES |
| MilspecPart | MS51957-B |
| Min. Tensile Strength (psi) | 80000 pounds per square inch |
| NIIN | 00-822-4520 |
| NSN | 5305-00-822-4520 |
| 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 303 plus x 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 323 or steel comp 324 or steel comp 347 or steel comp 348 or steel comp 384 or steel comp 385 |
| Size | 4-40 |
| Thread Class | 2a |
| Thread Diameter | 0.112 |
| Thread Direction | Right-hand |
| Thread Length | 0.794 inches minimum and 0.875 inches maximum |
| Thread Qty | 40 |
| Thread Qty Per Inch (tpi) | 40 |
| Thread Series Designator | UNC |
| Thread Size | 4-40 |
| Thread Type | Coarse Thread, UNC |
| Threads Per Inch | 40 |
| U.O.M. | Imperial |
| Weight | 0.0025 lb |
Cross-reference
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Catalog data updated 2026-07-05. Report a data error