The Screw,externally Relieved Body, cataloged under National Stock Number 5305-00-321-9138, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Raytheon Company Dba Raytheon Co. Government technical data includes 14 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-00-321-9138 |
| Primary Part Number | 370518-2 |
| Item Name | Screw,externally Relieved Body |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Raytheon Company Dba Raytheon Co |
| Status | ACTIVE |
| Head Height | 0.141 INCHES MINIMUM AND 0.156 INCHES MAXIMUM IN |
| Fastener Length | 0.625 INCHES NOMINAL IN |
| Thread Length | 0.340 INCHES MINIMUM AND 0.360 INCHES MAXIMUM IN |
| Material Document and Classification | QQ-S-763,300 SERIES FED SPEC SINGLE MATERIAL RESPONSE OR 66,300 SERIES FED STD SINGLE MATERIAL RESPONSE OR COMP 16-18 OR 18-8 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| First Diameter From Head | 0.115 INCHES MINIMUM AND 0.125 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.164 INCHES IN |
| Head Style | FILLISTER |
| Distance From Largest Bearing Surface of Head to End of First Diameter | 0.275 INCHES NOMINAL IN |
| Internal Drive Style | SLOT |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 32 |
| Material | STEEL CORROSION RESISTING OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 0.250 INCHES MINIMUM AND 0.270 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 |
NSN 5305-00-321-9138 is a Screw,externally Relieved Body, manufactured by Raytheon Company Dba Raytheon Co, classified under FSC 5305, Screws. Status: active.
NSN 5305-00-321-9138 has 2 manufacturer part numbers on file: 370518-2 (Raytheon Company), 370518-2 (Raytheon Company Dba Raytheon Co).
1 possible match (shared part number, not a government interchangeability claim): 2590-01-192-1928. Verify interchangeability with system specifications before substitution.
Key specifications for 370518-2: Head Height: 0.141 INCHES MINIMUM AND 0.156 INCHES MAXIMUM IN; Fastener Length: 0.625 INCHES NOMINAL IN; Thread Length: 0.340 INCHES MINIMUM AND 0.360 INCHES MAXIMUM IN; Material Document and Classification: QQ-S-763,300 SERIES FED SPEC SINGLE MATERIAL RESPONSE OR 66,300 SERIES FED STD SINGLE MATERIAL RESPONSE OR COMP 16-18 OR 18-8 ASSN STD SINGLE MATERIAL RESPONSE OVERALL. 14 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.