The Screw,cap,socket Head, cataloged under National Stock Number 5305-01-666-1126, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. Government technical data includes 20 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-666-1126 |
| Item Name | Screw,cap,socket Head |
| FSC / FSG | 5305 / 53 — Screws |
| Status | ACTIVE |
| Width Across Flats | 0.3750 INCHES MINIMUM AND 0.3790 INCHES MAXIMUM IN |
| Head Height | 0.492 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN |
| Fastener Length | 1.690 INCHES MINIMUM AND 1.750 INCHES MAXIMUM IN |
| Thread Length | 1.690 INCHES MINIMUM AND 1.750 INCHES MAXIMUM IN |
| Hole Configuration Style | ROUND INTERNAL HEXAGON |
| Material Document and Classification | FF-S-86 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.500 INCHES IN |
| Head Style | FLAT CHAMFER |
| Thread Direction | RIGHT-HAND |
| Specification/standard Data | 80205-NAS-24678 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| Minimum Tensile Strength | 170000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | HEXAGON |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 20 |
| Material | STEEL OVERALL |
| Hole Quantity | 3 |
| Thread Series Designator | UNF |
| Hole Type | DRILLED |
| Hole Diameter | 0.61 INCHES MINIMUM AND 0.67 INCHES MAXIMUM IN |
| Head Diameter | 0.735 INCHES MINIMUM AND 0.750 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 |
|---|---|
| MS24678-60U | 3/2 Design control — primary reference U.S. Government activity |
| MS24678-60U | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-666-1126 is a Screw,cap,socket Head, classified under FSC 5305, Screws. Status: active.
Key specifications for 5305-01-666-1126: Width Across Flats: 0.3750 INCHES MINIMUM AND 0.3790 INCHES MAXIMUM IN; Head Height: 0.492 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN; Fastener Length: 1.690 INCHES MINIMUM AND 1.750 INCHES MAXIMUM IN; Thread Length: 1.690 INCHES MINIMUM AND 1.750 INCHES MAXIMUM IN. 20 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.