The Nut,self-Locking,double Hexagon, cataloged under National Stock Number 5310-01-331-1276, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Bristol Industries, Llc. Government technical data includes 10 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-331-1276 |
| Primary Part Number | J1212P04F |
| Item Name | Nut,self-Locking,double Hexagon |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Bristol Industries, Llc |
| Status | ACTIVE |
| Width Across Flats | 0.312 INCHES NOMINAL IN |
| Thread Series | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Material Document and Classification | AMS 570 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.250 INCHES IN |
| Locking Feature | PREVAILING TORQUE ALL METAL DESIGN |
| Nut Height | 0.307 INCHES MINIMUM AND 0.322 INCHES MAXIMUM IN |
| Thread Class | 3B |
| Thread Quantity Per Inch | 28 |
| Material | NICKEL ALLOY UNS N07001 OVERALL |
| 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 |
|---|---|
| J1212P04F PRIMARY | Bristol Industries, Llc (USA) |
| J1212P04G PRIMARY | Sps Technologies, Llc Dba Cherry Aerospace Div Div Cherry Aerospace (USA) |
| J1212P04D | General Electric Company (USA) |
| J1212P04B PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| J1212P04C PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| J1212P04D | 3/2 Design control — primary reference U.S. Government activity |
| J1212P04A | 5/9 Secondary reference Harvard Industries Inc |
| J1212P04D | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
NSN 5310-01-331-1276 is a Nut,self-Locking,double Hexagon, manufactured by Bristol Industries, Llc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-331-1276 has 5 manufacturer part numbers on file: J1212P04F (Bristol Industries, Llc), J1212P04G (Sps Technologies, Llc Dba Cherry Aerospace Div Div Cherry Aerospace), J1212P04D (General Electric Company), J1212P04B (Howmet Global Fastening Systems Inc), J1212P04C (Sps Technologies, Llc Dba PB Fasteners).
Key specifications for J1212P04F: Width Across Flats: 0.312 INCHES NOMINAL IN; Thread Series: UNIFIED NATIONAL JOINT FINE (UNJF); Material Document and Classification: AMS 570 ASSN STD SINGLE MATERIAL RESPONSE OVERALL; Thread Direction: RIGHT-HAND. 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.