The Setscrew, cataloged under National Stock Number 5305-01-423-4745, 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 12 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 | 5305-01-423-4745 |
| Primary Part Number | 801-6556655 FIND A19 |
| Item Name | Setscrew |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Width Across Flats | 0.125 INCHES NOMINAL IN |
| Fastener Length | 0.438 INCHES NOMINAL IN |
| Thread Length | 0.438 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | HEADLESS (SETSCREW) |
| Thread Direction | RIGHT-HAND |
| Point Style | HALF DOG |
| Internal Drive Style | HEXAGON |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 20 |
| Material | STEEL CORROSION RESISTING OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| 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 |
|---|---|
| 218020471 | Naval Sea Systems Command (USA) |
| 801-6556655 FIND A19 PRIMARY | Naval Sea Systems Command (USA) |
NSN 5305-01-423-4745 is a Setscrew, manufactured by Naval Sea Systems Command, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-423-4745 has 2 manufacturer part numbers on file: 218020471 (Naval Sea Systems Command), 801-6556655 FIND A19 (Naval Sea Systems Command).
Key specifications for 801-6556655 FIND A19: Width Across Flats: 0.125 INCHES NOMINAL IN; Fastener Length: 0.438 INCHES NOMINAL IN; Thread Length: 0.438 INCHES NOMINAL IN; Nominal Thread Diameter: 0.250 INCHES IN. 12 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.