screws › machine screws
MS51957-13B
4-40X1/4 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 | Cross, Phillips |
| Drive Type | Phillips |
| Fastener Length | Between 0.219 inches and 0.250 inches |
| Finish | Black Oxide Coating |
| Full Size | #4-40 x 1/4 |
| Head Angle | 100 ? |
| Head Diameter | Between 0.205 inches and 0.219 inches |
| Head Height | Between 0.070 inches and 0.080 inches |
| Head Style | Pan Head |
| Head Type | Pan |
| Industry Standards/Certification | MS51957 |
| Internal Drive Style | Cross recess type 1 |
| Length | 1/4 in |
| Material | CRES |
| MilspecPart | MS51957-B |
| Min. Tensile Strength (psi) | 80000 pounds per square inch |
| NIIN | 00-494-7333 |
| NSN | 5305-00-494-7333 |
| Nondefinitive Specification/Std Data | 3 type and 9c style |
| Screw Material | Stainless steel |
| Screw Material Specification | 300 series federal standard 1st material response or comp 16-18 or 18-8 assn standard 2nd material response 300 series federal specification 1st material response or 66 qq-s-763 |
| Screw Surface Treatment | Oxide |
| Screw Surface Treatment Specification | Mil-c-13924 cl 4 military specification single treatment response |
| Size | 4-40 |
| Thread Class | 2a |
| Thread Diameter | 0.112 |
| Thread Direction | Right-hand |
| Thread Length | Between 0.169 inches and 0.250 inches |
| Thread Qty | 40 |
| Thread Qty Per Inch (tpi) | 40 |
| Thread Series | UNC |
| Thread Series Designator | Unc (coarse thread) |
| Thread Size | 4-40 |
| Thread Type | Coarse Thread, UNC |
| Threads Per Inch | 40 |
| U.O.M. | Imperial |
| Weight | 0.001 lb |
Cross-reference
Similar parts
Parts with matching key dimensions — often from a different standards family. Candidates for comparison only; verify the full specification before substituting.
- AN515UB4-4 AN #4-40 · 1/4 in · Pan Head
- LL51957-13 Other #4-40 · 1/4 in · Pan Head · CRES
- NAS1100-04-4 NAS #4-40 · 1/4 in · Pan Head · Steel
- NAS1100E04-4 NAS #4-40 · 1/4 in · Pan Head · Iron
- NAS1190-04P14 NAS #4-40 · 1/4 in · Pan Head · Steel
- NAS1190-04P4 NAS #4-40 · 1/4 in · Pan Head · Steel
- NAS1190-04P4B NAS #4-40 · 1/4 in · Pan Head · Steel
- NAS600-4B NAS #4-40 · 1/4 in · Pan Head · Steel
- NAS600-4P NAS #4-40 · 1/4 in · Pan Head · Steel
Looking for a specific part? Use the cross-reference lookup.
Catalog data updated 2026-07-05. Report a data error