The Screw,machine, cataloged under National Stock Number 5305-01-559-4409, 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 3 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-559-4409 |
| Primary Part Number | 91771A557 |
| Item Name | Screw,machine |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Mcmaster-Carr Supply Co |
| Status | ACTIVE |
| Thread Length | 0.500 INCHES NOMINAL IN |
| Thread Direction | RIGHT-HAND |
| Screw Material | STEEL |
| 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 |
|---|---|
| 91771A557 PRIMARY | Mcmaster-Carr Supply Co (USA) |
| Reference | Meaning |
|---|---|
| 91771A557 | 5/9 Secondary reference U.S. Government activity |
| 91771A557 | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-559-4409 is a Screw,machine, manufactured by Mcmaster-Carr Supply Co, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-559-4409 has 1 manufacturer part number on file: 91771A557 (Mcmaster-Carr Supply Co).
Key specifications for 91771A557: Thread Length: 0.500 INCHES NOMINAL IN; Thread Direction: RIGHT-HAND; Screw Material: STEEL; Special Features: 1/4"-28 THREAD;HEAD HEIGHT .153";WIDTH BETWEEN FLATS .477";NUMBER 3 DRIVE. 3 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.