The Screw,shoulder, cataloged under National Stock Number 5305-01-601-4263, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Mcmaster-Carr Supply Co. Government technical data includes 18 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 | 5305-01-601-4263 |
| Primary Part Number | 90298A575 |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Mcmaster-Carr Supply Co |
| Status | ACTIVE |
| Width Across Flats | 0.156 INCHES NOMINAL IN |
| Head Height | 0.218 INCHES NOMINAL IN |
| Fastener Length | 0.750 INCHES NOMINAL IN |
| Shoulder Length | 0.437 INCHES NOMINAL ALL SHOULDERS IN |
| Shoulder Diameter | 0.437 INCHES NOMINAL ALL SHOULDERS IN |
| Thread Length | 0.437 INCHES NOMINAL IN |
| Shoulder Shape | ROUND ALL SHOULDERS |
| Hardness Rating | 55.0 ROCKWELL B MINIMUM OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT FILLISTER |
| Thread Direction | RIGHT-HAND |
| Minimum Tensile Strength | 70000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | HEXAGON |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 20 |
| Material | STEEL PROPERTY CLASS 18.8 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 0.437 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 |
|---|---|
| 90298A575 PRIMARY | Mcmaster-Carr Supply Co (USA) |
| MC90298A575 | Dillon Aero, Inc. (USA) |
NSN 5305-01-601-4263 is a Screw,shoulder, manufactured by Mcmaster-Carr Supply Co, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-601-4263 has 2 manufacturer part numbers on file: 90298A575 (Mcmaster-Carr Supply Co), MC90298A575 (Dillon Aero, Inc.).
Key specifications for 90298A575: Width Across Flats: 0.156 INCHES NOMINAL IN; Head Height: 0.218 INCHES NOMINAL IN; Fastener Length: 0.750 INCHES NOMINAL IN; Shoulder Length: 0.437 INCHES NOMINAL ALL SHOULDERS IN. 18 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.