The Screw,machine, cataloged under National Stock Number 5305-01-374-5609, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Qualidyne Systems Inc. Government technical data includes 14 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-374-5609 |
| Primary Part Number | 021193 |
| Item Name | Screw,machine |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Qualidyne Systems Inc |
| Status | ACTIVE |
| Head Height | 0.060 INCHES NOMINAL IN |
| Screw Surface Treatment | ZINC |
| Fastener Length | 1.375 INCHES NOMINAL IN |
| Thread Length | 1.313 INCHES MINIMUM AND 1.375 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.138 INCHES IN |
| Head Style | FLAT COUNTERSUNK UNDERCUT |
| Thread Direction | RIGHT-HAND |
| Screw Material | STEEL |
| Internal Drive Style | CROSS RECESS TYPE II |
| Countersink Angle | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 32 |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 0.279 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 |
|---|---|
| 021193 PRIMARY | Qualidyne Systems Inc (USA) |
| Reference | Meaning |
|---|---|
| 021015 | 5/9 Secondary reference Qualidyne Systems Inc |
NSN 5305-01-374-5609 is a Screw,machine, manufactured by Qualidyne Systems Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-374-5609 has 1 manufacturer part number on file: 021193 (Qualidyne Systems Inc).
2 possible matches (shared part number, not a government interchangeability claim): 6630-01-497-6653, 6350-01-542-9906. Verify interchangeability with system specifications before substitution.
Key specifications for 021193: Head Height: 0.060 INCHES NOMINAL IN; Screw Surface Treatment: ZINC; Fastener Length: 1.375 INCHES NOMINAL IN; Thread Length: 1.313 INCHES MINIMUM AND 1.375 INCHES MAXIMUM IN. 14 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.