The Nut,plain,hexagon, cataloged under National Stock Number 5310-01-312-0245, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Souriau Usa, Inc. Dba Souriau Usa Inc. Government technical data includes 10 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-312-0245 |
| Primary Part Number | 25C HEN |
| Item Name | Nut,plain,hexagon |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Souriau Usa, Inc. Dba Souriau Usa Inc |
| Status | ACTIVE |
| Width Across Flats | 0.428 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN |
| Thread Series | UNIFIED NATIONAL COARSE (UNC) |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.250 INCHES IN |
| Nut Height | 0.212 INCHES MINIMUM AND 0.226 INCHES MAXIMUM IN |
| Nut Style | HEXAGON |
| Thread Class | 2B |
| Thread Quantity Per Inch | 20 |
| Material | COPPER ALLOY OVERALL |
| Bearing Surface Type | CHAMFERED OR 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 |
| Part Number | Manufacturer |
|---|---|
| 25C HEN PRIMARY | Souriau Usa, Inc. Dba Souriau Usa Inc (USA) |
| Reference | Meaning |
|---|---|
| GN510R4 | 7/2 Vendor item drawing reference Northrop Grumman Systems Corporation |
NSN 5310-01-312-0245 is a Nut,plain,hexagon, manufactured by Souriau Usa, Inc. Dba Souriau Usa Inc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-312-0245 has 1 manufacturer part number on file: 25C HEN (Souriau Usa, Inc. Dba Souriau Usa Inc).
Key specifications for 25C HEN: Width Across Flats: 0.428 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN; Thread Series: UNIFIED NATIONAL COARSE (UNC); Thread Direction: RIGHT-HAND; Nominal Thread Size: 0.250 INCHES IN. 10 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.