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MS51959-18B
Military Standard Machine Screw
Description
Fastener Length: 5/8", Thread: 4-40, Thread Length: 35/64", MS51959 series screw
Specifications
| Countersink Angle | Between 80.0 degrees and 82.0 degrees |
|---|---|
| Drive Style | Cross |
| End Application | sh-60f carrier based asw sparrow (aim-7); helicopter air--to-air ah-1w; missile advance attack hc-130); helicopter ec-130e mc-130h (ac-130h hh-60j; aircraft uscg search and rescue mh-53e; helicopter hh-60h; helicopter search and rescue t-39; austin ship class lpd-4 amphibious transport docks; ticonderoga class cg (47); helicopter aircraft |
| Fastener Length | Between 0.594 inches and 0.625 inches |
| Head Diameter | Between 0.195 inches and 0.225 inches |
| Head Style | Flat countersunk |
| Internal Drive Style | Cross recess type 1 |
| Length | 5/8 |
| Material | CRES |
| Min. Tensile Strength (psi) | 80000 pounds per square inch |
| Nondefinitive Specification/Std Data | 3 type and 2c 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 |
| Thread Class | 2a |
| Thread Diameter | 0.112 |
| Thread Direction | Right-hand |
| Thread Length | Between 0.477 inches and 0.558 inches |
| Thread Qty | 40 |
| Thread Qty Per Inch (tpi) | 40 |
| Thread Series | UNC |
| Thread Series Designator | Unc (coarse thread) |
Cross-reference
No interchangeable or dimensionally similar parts are on record for MS51959-18B. Try the cross-reference lookup to search by a different part number.
Catalog data updated 2026-07-05. Report a data error