The Setscrew, cataloged under National Stock Number 5305-01-677-8891, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Rtx Corporation Div Pratt & Whitney. Government technical data includes 11 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-677-8891 |
| Primary Part Number | 4550053 |
| Item Name | Setscrew |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Rtx Corporation Div Pratt & Whitney |
| Status | ACTIVE |
| Point Diameter | 0.245 INCHES MINIMUM AND 0.247 INCHES MAXIMUM IN |
| Hole Configuration Style | HEXAGON LONGITUDINAL HOLE |
| Point Chamfer Angle | 25.0 DEGREES MINIMUM AND 35.0 DEGREES MAXIMUM |
| Nominal Thread Diameter | 0.312 INCHES IN |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Point Style | CHAMFER DOG |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Hole Quantity | 1 |
| 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 |
|---|---|
| 4550053 PRIMARY | Rtx Corporation Div Pratt & Whitney (USA) |
NSN 5305-01-677-8891 is a Setscrew, manufactured by Rtx Corporation Div Pratt & Whitney, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-677-8891 has 1 manufacturer part number on file: 4550053 (Rtx Corporation Div Pratt & Whitney).
Key specifications for 4550053: Point Diameter: 0.245 INCHES MINIMUM AND 0.247 INCHES MAXIMUM IN; Hole Configuration Style: HEXAGON LONGITUDINAL HOLE; Point Chamfer Angle: 25.0 DEGREES MINIMUM AND 35.0 DEGREES MAXIMUM; Nominal Thread Diameter: 0.312 INCHES IN. 11 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.