The Screw,machine, cataloged under National Stock Number 5305-01-503-6660, 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 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-503-6660 |
| Primary Part Number | 124-6938645 PART 177 |
| Item Name | Screw,machine |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Head Height | 0.188 INCHES NOMINAL IN |
| Fastener Length | 0.562 INCHES NOMINAL IN |
| Screw Material Document and Classification | QQ-B-637 FED SPEC SINGLE MATERIAL RESPONSE |
| Thread Length | 0.562 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.312 INCHES IN |
| Head Style | FLAT FILLISTER |
| Thread Direction | RIGHT-HAND |
| Screw Material | COPPER ALLOY 464 |
| Internal Drive Style | SLOT |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 18 |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 0.938 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 |
|---|---|
| 124-6938645 PART 177 | Huntington Ingalls Inc Div Newport News Shipbuilding (USA) |
| 124-6938645 PART 177 PRIMARY | Naval Sea Systems Command (USA) |
NSN 5305-01-503-6660 is a Screw,machine, manufactured by Naval Sea Systems Command, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-503-6660 has 2 manufacturer part numbers on file: 124-6938645 PART 177 (Huntington Ingalls Inc Div Newport News Shipbuilding), 124-6938645 PART 177 (Naval Sea Systems Command).
Key specifications for 124-6938645 PART 177: Head Height: 0.188 INCHES NOMINAL IN; Fastener Length: 0.562 INCHES NOMINAL IN; Screw Material Document and Classification: QQ-B-637 FED SPEC SINGLE MATERIAL RESPONSE; Thread Length: 0.562 INCHES NOMINAL 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.