The Screw,cap,socket Head, cataloged under National Stock Number 5305-01-331-6283, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 13 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-331-6283 |
| Primary Part Number | 803-5959304-X-51 |
| Item Name | Screw,cap,socket Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Width Across Flats | 1.750 INCHES MINIMUM AND 1.760 INCHES MAXIMUM IN |
| Head Height | 2.250 INCHES NOMINAL IN |
| Fastener Length | 4.250 INCHES NOMINAL IN |
| Thread Length | 3.380 INCHES MINIMUM AND 4.250 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 2.250 INCHES IN |
| Head Style | FLAT CHAMFER |
| Thread Direction | RIGHT-HAND |
| Internal Drive Style | HEXAGON |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 45 |
| Material | TITANIUM ALLOY UNS R56400 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 3.380 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 803-5959304-X-51 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 5959304-51 | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-331-6283 is a Screw,cap,socket Head, manufactured by Naval Sea Systems Command, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-331-6283 has 1 manufacturer part number on file: 803-5959304-X-51 (Naval Sea Systems Command).
Key specifications for 803-5959304-X-51: Width Across Flats: 1.750 INCHES MINIMUM AND 1.760 INCHES MAXIMUM IN; Head Height: 2.250 INCHES NOMINAL IN; Fastener Length: 4.250 INCHES NOMINAL IN; Thread Length: 3.380 INCHES MINIMUM AND 4.250 INCHES MAXIMUM IN. 13 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.