The Screw,externally Relieved Body, cataloged under National Stock Number 5305-01-491-0534, 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 20 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-491-0534 |
| Primary Part Number | 5924811-101 |
| Item Name | Screw,externally Relieved Body |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Width Across Flats | 0.177 INCHES MINIMUM AND 0.197 INCHES MAXIMUM IN |
| Head Height | 0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN |
| Fastener Length | 1.470 INCHES MINIMUM AND 1.530 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | XXB000 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.365 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN |
| Material Document and Classification | QQ-S-764;CLASS 7;TYPE A FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| First Diameter From Head | 0.225 INCHES MINIMUM AND 0.235 INCHES MAXIMUM IN |
| Distance From Largest Bearing Surface of Head to End of Second Diameter | 1.470 INCHES MINIMUM AND 1.530 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.312 INCHES IN |
| Head Style | FLAT CHAMFER |
| Thread Direction | RIGHT-HAND |
| Second Diameter From Head | 0.214 INCHES MINIMUM AND 0.230 INCHES MAXIMUM IN |
| Distance From Largest Bearing Surface of Head to End of First Diameter | 0.865 INCHES MINIMUM AND 0.885 INCHES MAXIMUM IN |
| Externally Relieved Body Diameter Quantity | 2 |
| Internal Drive Style | HEXAGON |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 18 |
| Material | STEEL CORROSION RESISTING OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 0.615 INCHES MINIMUM AND 0.635 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 |
| Part Number | Manufacturer |
|---|---|
| 5924811-101 PRIMARY | Naval Sea Systems Command (USA) |
| MX1026 | Unicorp. (USA) |
| Reference | Meaning |
|---|---|
| SEC5924811-101 | 5/9 Secondary reference Fastener Components Inc |
| 5073-M07-F15 | 5/9 Secondary reference Unicorp. |
NSN 5305-01-491-0534 is a Screw,externally Relieved Body, manufactured by Naval Sea Systems Command, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-491-0534 has 2 manufacturer part numbers on file: 5924811-101 (Naval Sea Systems Command), MX1026 (Unicorp.).
Key specifications for 5924811-101: Width Across Flats: 0.177 INCHES MINIMUM AND 0.197 INCHES MAXIMUM IN; Head Height: 0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN; Fastener Length: 1.470 INCHES MINIMUM AND 1.530 INCHES MAXIMUM IN; Surface Treatment Document and Classification: XXB000 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL. 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.