The Nut,self-Locking,double Hexagon, cataloged under National Stock Number 5310-01-446-2375, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Howmet Global Fastening Systems Inc. Government technical data includes 15 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5310-01-446-2375 |
| Primary Part Number | H49674-836 |
| Item Name | Nut,self-Locking,double Hexagon |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Howmet Global Fastening Systems Inc |
| Status | ACTIVE |
| Width Across Flats | 0.294 INCHES NOMINAL IN |
| Thread Series | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Precious Material | SILVER |
| Hardness Rating | 39.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM |
| Material Document and Classification | AMS 5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.164 INCHES IN |
| Locking Feature | PREVAILING TORQUE ALL METAL DESIGN |
| Nut Height | 0.230 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN |
| Surface Treatment | SILVER OVERALL |
| Nut Style | DOUBLE HEXAGON |
| Thread Class | 3B |
| Thread Quantity Per Inch | 36 |
| Material | IRON ALLOY 660 OVERALL |
| Bearing Surface Type | CHAMFERED |
| 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 |
|---|---|
| H49674-836 PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| AS3068-08 PRIMARY | Sae International Dba Sae International (USA) |
| Reference | Meaning |
|---|---|
| AS3068-08 | 5/9 Secondary reference U.S. Government activity |
NSN 5310-01-446-2375 is a Nut,self-Locking,double Hexagon, manufactured by Howmet Global Fastening Systems Inc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-446-2375 has 2 manufacturer part numbers on file: H49674-836 (Howmet Global Fastening Systems Inc), AS3068-08 (Sae International Dba Sae International).
1 possible match (shared part number, not a government interchangeability claim): 2840-01-468-5297. Verify interchangeability with system specifications before substitution.
Key specifications for H49674-836: Width Across Flats: 0.294 INCHES NOMINAL IN; Thread Series: UNIFIED NATIONAL JOINT FINE (UNJF); Precious Material: SILVER; Hardness Rating: 39.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM. 15 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.