The Screw,cap,socket Head, cataloged under National Stock Number 5305-01-203-6441, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. Government technical data includes 19 specifications, cited from the U.S. Government catalog. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-203-6441 |
| Item Name | Screw,cap,socket Head |
| FSC / FSG | 5305 / 53 — Screws |
| Status | ACTIVE |
| Width Across Flats | 0.500 INCHES MINIMUM AND 0.505 INCHES MAXIMUM IN |
| Head Height | 0.616 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN |
| Fastener Length | 6.380 INCHES MINIMUM AND 6.500 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-416,TY2,CL3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 4.500 INCHES NOMINAL IN |
| Hardness Rating | 36.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM OVERALL |
| Nominal Thread Diameter | 0.625 INCHES IN |
| Head Style | FLAT CHAMFER |
| Thread Direction | RIGHT-HAND |
| Nondefinitive Spec/std Data | 6 TYPE |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Minimum Tensile Strength | 160000 POUNDS PER SQUARE INCH LBS |
| Minimum Yield Strength | 150000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | HEXAGON |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 11 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 0.921 INCHES MINIMUM AND 0.938 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 |
|---|---|
| FF-S-86 | 5/9 Secondary reference U.S. Government activity |
| NAS1352-10-104P | 3/2 Design control — primary reference U.S. Government activity |
| 4176084-90 | 5/9 Secondary reference Raytheon Company Div Rmd Strategic |
| MS16997-180 | 5/9 Secondary reference U.S. Government activity |
| NAS1352-180 | 5/9 Secondary reference U.S. Government activity |
| NAS1352-10-104P | 5/9 Secondary reference U.S. Government activity |
| NAS1352-10-72P | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-203-6441 is a Screw,cap,socket Head, classified under FSC 5305, Screws. Status: active.
Key specifications for 5305-01-203-6441: Width Across Flats: 0.500 INCHES MINIMUM AND 0.505 INCHES MAXIMUM IN; Head Height: 0.616 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN; Fastener Length: 6.380 INCHES MINIMUM AND 6.500 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-416,TY2,CL3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL. 19 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.