The Nut,self-Locking,hexagon, cataloged under National Stock Number 5310-01-154-2602, 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 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5310-01-154-2602 |
| Primary Part Number | H50540-5 |
| Item Name | Nut,self-Locking,hexagon |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Howmet Global Fastening Systems Inc |
| Status | ACTIVE |
| Width Across Flats | 0.492 INCHES MINIMUM AND 0.502 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | AMS2411 ASSN STD SINGLE TREATMENT RESPONSE THREADS |
| Thread Series | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Nut Counterbore Depth | 0.050 INCHES MINIMUM AND 0.060 INCHES MAXIMUM OVERALL IN |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.313 INCHES IN |
| Counterbore Diameter | 0.335 INCHES MINIMUM AND 0.345 INCHES MAXIMUM OVERALL IN |
| Locking Feature | PREVAILING TORQUE ALL METAL DESIGN |
| Nut Height | 0.400 INCHES MINIMUM AND 0.415 INCHES MAXIMUM IN |
| Surface Treatment | SILVER THREADS |
| Nut Style | HEXAGON |
| Thread Class | 3B |
| Thread Quantity Per Inch | 24 |
| Material | STEEL 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 |
|---|---|
| H50540-5 PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| Reference | Meaning |
|---|---|
| E12293-5 | 5/9 Secondary reference Harvard Industries Inc |
| 10109837 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| 3020T63P05 | 3/2 Design control — primary reference U.S. Government activity |
| 3020T63 | 1/2 Source control — Government-approved source U.S. Government activity |
| UN1301W054-4 | 5/9 Secondary reference U.S. Government activity |
| 3020T63P06 | 3/2 Design control — primary reference U.S. Government activity |
| 3020T63P09 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5310-01-154-2602 is a Nut,self-Locking,hexagon, manufactured by Howmet Global Fastening Systems Inc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-154-2602 has 1 manufacturer part number on file: H50540-5 (Howmet Global Fastening Systems Inc).
1 possible match (shared part number, not a government interchangeability claim): 5310-01-443-1623. Verify interchangeability with system specifications before substitution.
Key specifications for H50540-5: Width Across Flats: 0.492 INCHES MINIMUM AND 0.502 INCHES MAXIMUM IN; Surface Treatment Document and Classification: AMS2411 ASSN STD SINGLE TREATMENT RESPONSE THREADS; Thread Series: UNIFIED NATIONAL JOINT FINE (UNJF); Nut Counterbore Depth: 0.050 INCHES MINIMUM AND 0.060 INCHES MAXIMUM OVERALL IN. 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.