The Nut,plain,hexagon, cataloged under National Stock Number 5310-00-221-4876, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. Government technical data includes 11 specifications, cited from the U.S. Government catalog. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 5310-00-221-4876 |
| Item Name | Nut,plain,hexagon |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Width Across Flats | 0.500 INCHES NOMINAL IN |
| Thread Series | UNEF |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.375 INCHES IN |
| Nut Height | 0.094 INCHES NOMINAL IN |
| Surface Treatment | CADMIUM OR NICKEL OVERALL |
| Nut Style | HEXAGON |
| Thread Class | 2B |
| Thread Quantity Per Inch | 32 |
| Material | COPPER ALLOY OVERALL |
| Bearing Surface Type | WASHER FACED |
| 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 |
|---|---|
| 45T1 | C/1 Advisory reference — outside the item-of-supply concept Cts Corp Electromechanical Div |
| 21769 | 5/9 Secondary reference Amphenol Corp Div Amphenol Aerospace Operations |
| 45T1 | 3/9 Design control — primary reference Cts Corp |
| 21769 | 5/2 Secondary reference U.S. Government activity |
| 21769 | 5/9 Secondary reference Unison Industries Llc |
NSN 5310-00-221-4876 is a Nut,plain,hexagon, classified under FSC 5310, Nuts and Washers. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 4730-00-453-0491, 4320-01-507-3876. Verify interchangeability with system specifications before substitution.
Key specifications for 5310-00-221-4876: Width Across Flats: 0.500 INCHES NOMINAL IN; Thread Series: UNEF; Thread Direction: RIGHT-HAND; Nominal Thread Size: 0.375 INCHES IN. 11 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.