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MS51959-15B
Military Standard Machine Screw
Description
Fastener Length: 3/8", Thread: 4-40, Thread Length: 19/64", black oxide, MS51959 series screw
Specifications
| Countersink Angle | Between 80.0 degrees and 82.0 degrees |
|---|---|
| Departure From Cited Designator | As modified by finish |
| Drive Style | Cross |
| Fastener Length | Between 0.344 inches and 0.375 inches |
| Head Diameter | Between 0.195 inches and 0.225 inches |
| Head Style | Flat countersunk |
| Internal Drive Style | Cross recess type 1 |
| Length | 3/8 |
| Material | CRES |
| 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 |
| Min. Tensile Strength (psi) | 80000 pounds per square inch |
| Nondefinitive Specification/Std Data | 3 type and 2c style |
| Screw Material | Stainless steel |
| Surface Treatment | Oxide |
| Surface Treatment Specification | Cl 4 military specification single treatment response mil-c-13924 |
| Thread Class | 2a |
| Thread Diameter | 0.112 |
| Thread Direction | Right-hand |
| Thread Length | Between 0.227 inches and 0.308 inches |
| Thread Qty | 40 |
| Thread Qty Per Inch (tpi) | 40 |
| Thread Series | UNC |
| Thread Series Designator | Unc (coarse thread) |
| Thread Size | 4 |
Cross-reference
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Catalog data updated 2026-07-05. Report a data error