The Screw,machine, cataloged under National Stock Number 5305-01-079-0302, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Unison Industries Llc. Government technical data includes 13 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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 | 5305-01-079-0302 |
| Primary Part Number | 61371 |
| Item Name | Screw,machine |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Unison Industries Llc |
| Status | ACTIVE |
| Fastener Length | 0.258 INCHES NOMINAL IN |
| Thread Length | 0.258 INCHES NOMINAL IN |
| Hardness Rating | 23.0 ROCKWELL C MINIMUM AND 27.0 ROCKWELL C MAXIMUM |
| Nominal Thread Diameter | 0.138 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Screw Material | STEEL COMP 4140 OR STEEL COMP 6150 OR STEEL COMP 8630 OR STEEL COMP 8740 OR STEEL COMP 8750 |
| Internal Drive Style | SLOT |
| Countersink Angle | 100.0 DEGREES NOMINAL |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 32 |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 0.268 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 |
|---|---|
| 61371 PRIMARY | Unison Industries Llc (USA) |
| Reference | Meaning |
|---|---|
| 61371 | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-079-0302 is a Screw,machine, manufactured by Unison Industries Llc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-079-0302 has 1 manufacturer part number on file: 61371 (Unison Industries Llc).
3 possible matches (shared part number, not a government interchangeability claim): 5930-01-265-2002, 4820-01-273-4735, 5310-01-374-3291. Verify interchangeability with system specifications before substitution.
Key specifications for 61371: Fastener Length: 0.258 INCHES NOMINAL IN; Thread Length: 0.258 INCHES NOMINAL IN; Hardness Rating: 23.0 ROCKWELL C MINIMUM AND 27.0 ROCKWELL C MAXIMUM; Nominal Thread Diameter: 0.138 INCHES IN. 13 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.