The Screw,externally Relieved Body, cataloged under National Stock Number 5305-01-381-4305, 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 22 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-381-4305 |
| Primary Part Number | 6261056 |
| Item Name | Screw,externally Relieved Body |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Width Across Flats | 0.085 INCHES NOMINAL IN |
| Head Height | 0.157 INCHES NOMINAL IN |
| Fastener Length | 0.318 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.127 INCHES MINIMUM AND 0.130 INCHES MAXIMUM IN |
| Material Document and Classification | ASTMA276 ASSN STD SINGLE MATERIAL RESPONSE OR QQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| First Diameter From Head | 0.171 INCHES MINIMUM AND 0.174 INCHES MAXIMUM IN |
| Distance From Largest Bearing Surface of Head to End of Second Diameter | 0.124 INCHES MINIMUM AND 0.128 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.138 INCHES IN |
| Distance From Largest Bearing Surface of Head to End of Third Diameter | 0.188 INCHES MINIMUM AND 0.191 INCHES MAXIMUM IN |
| Head Style | FLAT CHAMFER |
| Thread Direction | RIGHT-HAND |
| Second Diameter From Head | 0.183 INCHES MINIMUM AND 0.186 INCHES MAXIMUM IN |
| Externally Relieved Body Diameter Quantity | 3 |
| Surface Treatment | PASSIVATE OVERALL |
| Internal Drive Style | HEXAGON |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 32 |
| Material | STEEL COMP 304L OVERALL |
| Third Diameter From Head | 0.102 INCHES MINIMUM AND 0.105 INCHES MAXIMUM IN |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 0.312 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 |
|---|---|
| 6261056 PRIMARY | Naval Sea Systems Command (USA) |
NSN 5305-01-381-4305 is a Screw,externally Relieved Body, manufactured by Naval Sea Systems Command, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-381-4305 has 1 manufacturer part number on file: 6261056 (Naval Sea Systems Command).
Key specifications for 6261056: Width Across Flats: 0.085 INCHES NOMINAL IN; Head Height: 0.157 INCHES NOMINAL IN; Fastener Length: 0.318 INCHES NOMINAL IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL. 22 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.