screws › machine screws
MS51957-4B
2-56X5/16 MS51957-B Phil Pan M/S Coarse Full Thread 300 Series S/S DFAR Black Ox
Description
Fastener Length: 5/16", Thread: 2-56, Thread Length: 5/16", MS51957 series screw
Specifications
| Diameter | #2 |
|---|---|
| Drive | Phillips |
| Drive Type | Phillips |
| Fastener Length | Between 0.281 inches and 0.312 inches |
| Finish | Black Oxide |
| Full Size | #2-56 x 5/16 |
| Head Diameter | Between 0.155 inches and 0.167 inches |
| Head Height | Between 0.053 inches and 0.062 inches |
| Head Style | Pan Head |
| Head Type | Pan |
| Internal Drive Style | Cross recess type 1 |
| Length | 5/16 |
| 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 | Stainless steel or 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 | 2-56 |
| Thread Class | 2a |
| Thread Diameter | 0.086 |
| Thread Direction | Right-hand |
| Thread Length | Between 0.245 inches and 0.312 inches |
| Thread Qty | 56 |
| Thread Qty Per Inch (tpi) | 56 |
| Thread Series | UNC |
| Thread Series Designator | Unc (coarse thread) |
| Thread Size | 2 |
| Thread Type | UNC |
| Threads Per Inch | 56 |
| U.O.M. | Imperial |
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.
- NAS1100-02-5 NAS #2-56 · 5/16 in · Pan Head · Steel
- NAS1100E02-5 NAS #2-56 · 5/16 in · Pan Head · Iron
Looking for a specific part? Use the cross-reference lookup.
Catalog data updated 2026-07-05. Report a data error