The Nut,self-Locking,single Ball Sea, cataloged under National Stock Number 5310-00-124-2121, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is The Boeing Company Div Defense. Government technical data includes 15 specifications, cited from the U.S. Government catalog. The record lists 6 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-124-2121 |
| Primary Part Number | 3M347L5 |
| Item Name | Nut,self-Locking,single Ball Sea |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Lubrication | SOLUBLE LUBRICANT |
| Width Across Flats | 0.366 INCHES MINIMUM AND 0.376 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Series | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Hardness Rating | 36.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.312 INCHES IN |
| Locking Feature | PREVAILING TORQUE ALL METAL DESIGN |
| Nut Height | 0.280 INCHES MINIMUM AND 0.290 INCHES MAXIMUM IN |
| Ball Seat Radius | 0.380 INCHES NOMINAL IN |
| Surface Treatment | CADMIUM OVERALL |
| Nut Style | SINGLE BALL SEAT, HEXAGON |
| Thread Class | 3B |
| Thread Quantity Per Inch | 24 |
| Material | STEEL 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 |
|---|---|
| 3M347L5 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| 3M347L5 PRIMARY | The Boeing Company Div Defense (USA) |
| TLN1020L5N | Fairchild Fasteners Europe - Vsd Gmbh (DEU) |
| 3M347L5 | Fairchild Fasteners Europe - Vsd Gmbh (DEU) |
| 3M347L5 | Huck International, Inc (USA) |
| 3M347L5 | Howmet Global Fastening Systems Inc (USA) |
| Reference | Meaning |
|---|---|
| TLN1020L5N | 5/9 Secondary reference U.S. Government activity |
| TLN1020L5N | 5/9 Secondary reference U.S. Government activity |
| 3M347L5 | 5/2 Secondary reference U.S. Government activity |
| 3M347L5 | 5/2 Secondary reference U.S. Government activity |
NSN 5310-00-124-2121 is a Nut,self-Locking,single Ball Sea, manufactured by The Boeing Company Div Defense, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-124-2121 has 6 manufacturer part numbers on file: 3M347L5 (Sps Technologies, Llc Dba PB Fasteners), 3M347L5 (The Boeing Company Div Defense), TLN1020L5N (Fairchild Fasteners Europe - Vsd Gmbh), 3M347L5 (Fairchild Fasteners Europe - Vsd Gmbh), 3M347L5 (Huck International, Inc) and 1 more.
Key specifications for 3M347L5: Lubrication: SOLUBLE LUBRICANT; Width Across Flats: 0.366 INCHES MINIMUM AND 0.376 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Series: UNIFIED NATIONAL JOINT FINE (UNJF). 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.