The Screw,shoulder, cataloged under National Stock Number 5305-01-540-5201, 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 16 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 | 5305-01-540-5201 |
| Primary Part Number | 91259A622 |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Mcmaster-Carr Supply Co |
| Status | ACTIVE |
| Width Across Flats | 0.188 INCHES NOMINAL IN |
| Head Height | 0.250 INCHES NOMINAL IN |
| Fastener Length | 1.250 INCHES NOMINAL IN |
| Shoulder Length | 0.750 INCHES NOMINAL FIRST SHOULDER IN |
| Shoulder Diameter | 0.375 INCHES NOMINAL FIRST SHOULDER IN |
| Thread Length | 0.500 INCHES NOMINAL IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Nominal Thread Diameter | 0.313 INCHES IN |
| Head Style | FLAT FILLISTER |
| Thread Direction | RIGHT-HAND |
| Internal Drive Style | HEXAGON |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 18 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 0.563 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 |
|---|---|
| 91259A622 PRIMARY | Mcmaster-Carr Supply Co (USA) |
NSN 5305-01-540-5201 is a Screw,shoulder, manufactured by Mcmaster-Carr Supply Co, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-540-5201 has 1 manufacturer part number on file: 91259A622 (Mcmaster-Carr Supply Co).
Key specifications for 91259A622: Width Across Flats: 0.188 INCHES NOMINAL IN; Head Height: 0.250 INCHES NOMINAL IN; Fastener Length: 1.250 INCHES NOMINAL IN; Shoulder Length: 0.750 INCHES NOMINAL FIRST SHOULDER IN. 16 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.