The Nut,self-Locking,hexagon, cataloged under National Stock Number 5310-01-361-7085, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Northrop Grumman Systems Corporation Dba Northrop Grumman Is Div Northrop Grumman Aeronautics Systems. Government technical data includes 15 specifications, cited from the U.S. Government catalog. The record lists 5 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-361-7085 |
| Primary Part Number | 03A251-8 |
| Item Name | Nut,self-Locking,hexagon |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Northrop Grumman Systems Corporation Dba Northrop Grumman Is Div Northrop Grumman Aeronautics Systems |
| Status | ACTIVE |
| Width Across Flats | 0.740 INCHES MINIMUM AND 0.752 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-416TY2CL2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL EXCEPT INSERT |
| Thread Series | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Hardness Rating | 34.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM |
| Material Document and Classification | MIL-S-6758 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL EXCEPT INSERT |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.500 INCHES IN |
| Locking Feature | PREVAILING TORQUE WITH NONMETALLIC INSERT |
| Nut Height | 0.303 INCHES MINIMUM AND 0.323 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL EXCEPT INSERT |
| Nut Style | HEXAGON |
| Thread Class | 3B |
| Thread Quantity Per Inch | 20 |
| Material | STEEL COMP 4130 OVERALL EXCEPT INSERT |
| 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 |
|---|---|
| 03A251-8 | Northrop Grumman Systems Corp Dba Northrop Grumman Computing Systems (USA) |
| H52874-8 | Howmet Global Fastening Systems Inc (USA) |
| 03A251-8 PRIMARY | Northrop Grumman Systems Corporation Dba Northrop Grumman Is Div Northrop Grumman Aeronautics Systems (USA) |
| T-1156-8 | Long-Lok, Llc (USA) |
| T-1156-8 | Long-Lok Llc (USA) |
| Reference | Meaning |
|---|---|
| AD03A251-8 | 5/2 Secondary reference U.S. Government activity |
NSN 5310-01-361-7085 is a Nut,self-Locking,hexagon, manufactured by Northrop Grumman Systems Corporation Dba Northrop Grumman Is Div Northrop Grumman Aeronautics Systems, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-361-7085 has 5 manufacturer part numbers on file: 03A251-8 (Northrop Grumman Systems Corp Dba Northrop Grumman Computing Systems), H52874-8 (Howmet Global Fastening Systems Inc), 03A251-8 (Northrop Grumman Systems Corporation Dba Northrop Grumman Is Div Northrop Grumman Aeronautics Systems), T-1156-8 (Long-Lok, Llc), T-1156-8 (Long-Lok Llc).
Key specifications for 03A251-8: Width Across Flats: 0.740 INCHES MINIMUM AND 0.752 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-416TY2CL2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL EXCEPT INSERT; Thread Series: UNIFIED NATIONAL JOINT FINE (UNJF); Hardness Rating: 34.0 ROCKWELL C MINIMUM AND 38.0 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.