The Screw,cap,hexagon Head, cataloged under National Stock Number 5305-01-666-3279, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Oshkosh Defense 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-666-3279 |
| Primary Part Number | 4000280013 |
| Item Name | Screw,cap,hexagon Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Oshkosh Defense Llc |
| Status | ACTIVE |
| Head Height | 0.195 INCHES MINIMUM AND 0.211 INCHES MAXIMUM IN |
| Fastener Length | 2.25 INCHES NOMINAL IN |
| Thread Length | 0.88 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.31 INCHES IN |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 0.489 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN |
| Color | BLACK OVERALL |
| Surface Treatment | PHOSPHATE ZINC OVERALL |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 18 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| 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 |
|---|---|
| 4000280013 PRIMARY | Oshkosh Defense Llc (USA) |
| Reference | Meaning |
|---|---|
| 4000280 | D/9 Drawing number reference only Oshkosh Defense Llc |
NSN 5305-01-666-3279 is a Screw,cap,hexagon Head, manufactured by Oshkosh Defense Llc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-666-3279 has 1 manufacturer part number on file: 4000280013 (Oshkosh Defense Llc).
1 possible match (shared part number, not a government interchangeability claim): 5305-01-687-2729. Verify interchangeability with system specifications before substitution.
Key specifications for 4000280013: Head Height: 0.195 INCHES MINIMUM AND 0.211 INCHES MAXIMUM IN; Fastener Length: 2.25 INCHES NOMINAL IN; Thread Length: 0.88 INCHES NOMINAL IN; Nominal Thread Diameter: 0.31 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.