The Screw,cap,hexagon Head, cataloged under National Stock Number 5305-01-491-4774, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. Government technical data includes 7 specifications, cited from the U.S. Government catalog. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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 | 5305-01-491-4774 |
| Item Name | Screw,cap,hexagon Head |
| FSC / FSG | 5305 / 53 — Screws |
| Status | ACTIVE |
| Fastener Length | 0.500 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 20 |
| 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 |
| Reference | Meaning |
|---|---|
| 7069305 ITEM 35 | 5/1 Secondary reference Naval Sea Systems Command |
| 709-5486661 ITEM 018 | 5/1 Secondary reference Naval Sea Systems Command |
| 0.250-20UNC-2AX0.500LG NICU | 2/2 Government specification standardization U.S. Government activity |
| 561-7409898-20 | C/1 Advisory reference — outside the item-of-supply concept Zf Industrieantriebe Witten Gmbh |
| 185-7069305 | 5/9 Secondary reference Naval Sea Systems Command |
| 185-7069305 PAR | C/1 Advisory reference — outside the item-of-supply concept Naval Sea Systems Command |
| H422-7010 PART 32 | 5/1 Secondary reference U.S. Government activity |
NSN 5305-01-491-4774 is a Screw,cap,hexagon Head, classified under FSC 5305, Screws. Status: active.
3 possible matches (shared part number, not a government interchangeability claim): 4330-01-491-9732, 5305-01-524-2341, 5305-01-556-0297. Verify interchangeability with system specifications before substitution.
Key specifications for 5305-01-491-4774: Fastener Length: 0.500 INCHES NOMINAL IN; Nominal Thread Diameter: 0.250 INCHES IN; Head Style: HEXAGON; Thread Direction: RIGHT-HAND. 7 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.