The Screw,cap,socket Head, cataloged under National Stock Number 5305-01-579-9950, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. Government technical data includes 16 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-579-9950 |
| Item Name | Screw,cap,socket Head |
| FSC / FSG | 5305 / 53 — Screws |
| Status | ACTIVE |
| Fastener Length | 0.750 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | ASTM B 633 MIL STD SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.750 INCHES MINIMUM IN |
| Nominal Thread Diameter | 0.112 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 0.062 INCHES NOMINAL IN |
| Surface Treatment | ZINC OVERALL |
| Minimum Tensile Strength | 900 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | CROSS RECESS TYPE II |
| Countersink Angle | 80.0 DEGREES MINIMUM AND 84.0 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 40 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 0.218 INCHES MINIMUM AND 0.255 INCHES MAXIMUM IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| MS24667 | 4/1 Identification reference U.S. Government activity |
| MS24667-59Z | 5/9 Secondary reference U.S. Government activity |
| MS24667-59Z | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-01-579-9950 is a Screw,cap,socket Head, classified under FSC 5305, Screws. Status: active.
3 possible matches (shared part number, not a government interchangeability claim): 5305-01-587-5565, 5305-01-628-5145, 5305-01-692-7492. Verify interchangeability with system specifications before substitution.
Key specifications for 5305-01-579-9950: Fastener Length: 0.750 INCHES NOMINAL IN; Surface Treatment Document and Classification: ASTM B 633 MIL STD SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.750 INCHES MINIMUM IN; Nominal Thread Diameter: 0.112 INCHES IN. 16 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.