The Setscrew, cataloged under National Stock Number 5305-01-497-3975, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Rolls Royce Corp. Government technical data includes 19 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 | 5305-01-497-3975 |
| Primary Part Number | NAS1081C4A8N |
| Item Name | Setscrew |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Rolls Royce Corp |
| Status | ACTIVE |
| Point Diameter | 0.118 INCHES MINIMUM AND 0.132 INCHES MAXIMUM IN |
| Width Across Flats | 0.125 INCHES MINIMUM AND 0.127 INCHES MAXIMUM IN |
| Point Length | 0.001 INCHES NOMINAL IN |
| Fastener Length | 0.500 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | QQ-P-35, TYPE II FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.500 INCHES NOMINAL IN |
| Material Document and Classification | AMS 5640 TYPE 1 OR 2 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Point Chamfer Angle | 116.0 DEGREES MINIMUM AND 120.0 DEGREES MAXIMUM |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | HEADLESS (SETSCREW) |
| Thread Direction | RIGHT-HAND |
| Point Style | FLAT |
| Locking Feature | PATCH OR STRIP OR SLOTTED THREADS |
| Surface Treatment | PASSIVATE OVERALL |
| Internal Drive Style | HEXAGON |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL COMP 303SE OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| 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 |
|---|---|
| NAS1081C4A8N PRIMARY | Rolls Royce Corp (USA) |
| NAS1081C4A8N | Rolls-Royce Corporation (USA) |
NSN 5305-01-497-3975 is a Setscrew, manufactured by Rolls Royce Corp, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-497-3975 has 2 manufacturer part numbers on file: NAS1081C4A8N (Rolls Royce Corp), NAS1081C4A8N (Rolls-Royce Corporation).
Key specifications for NAS1081C4A8N: Point Diameter: 0.118 INCHES MINIMUM AND 0.132 INCHES MAXIMUM IN; Width Across Flats: 0.125 INCHES MINIMUM AND 0.127 INCHES MAXIMUM IN; Point Length: 0.001 INCHES NOMINAL IN; Fastener Length: 0.500 INCHES NOMINAL IN. 19 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.