The Nut,self-Locking,extended Washer, cataloged under National Stock Number 5310-01-352-8802, 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 16 specifications, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 9 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-352-8802 |
| Primary Part Number | KFN526L-6 |
| Item Name | Nut,self-Locking,extended Washer |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Bristol Industries, Llc |
| Status | ACTIVE |
| Washer Outside Diameter | 0.675 INCHES MINIMUM AND 0.685 INCHES MAXIMUM IN |
| Width Across Flats | 0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | MIL-L-8937 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Series | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Washer Thickness | 0.150 INCHES MINIMUM AND 0.160 INCHES MAXIMUM IN |
| Material Document and Classification | AMS 5731 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5734 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5736 ASSN STD SINGLE MATERIAL RESPONSE NUT |
| Material Document and Classification | AMS 5731 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5737 ASSN STD SINGLE MATERIAL RESPONSE WASHER |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.375 INCHES IN |
| Locking Feature | PREVAILING TORQUE ALL METAL DESIGN |
| Surface Treatment | DISULFIDE MOLYBDENUM OVERALL |
| Nut Style | HEXAGON |
| Thread Class | 3B |
| Thread Quantity Per Inch | 24 |
| Material | STEEL CORROSION RESISTING NUT |
| Material | STEEL CORROSION RESISTING WASHER |
| 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 |
|---|---|
| KFN526L-6 PRIMARY | Bristol Industries, Llc (USA) |
| KFN526L-6 | Howmet Global Fastening Systems Inc (USA) |
| KFN526L-6 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| 03A137-6L | Northrop Grumman Systems Corp Dba Northrop Grumman Computing Systems (USA) |
| Reference | Meaning |
|---|---|
| KFN526L-6 | 5/9 Secondary reference U.S. Government activity |
| KFN526L-6 | 5/9 Secondary reference U.S. Government activity |
| 03A137-6L | 5/9 Secondary reference Howmet Global Fastening Systems Inc |
| 03A137-6L | 5/9 Secondary reference Northrop Grumman Systems Corporation Dba Northrop Grumman Is Div Northrop Grumman Aeronautics Systems |
| BH137M6 | 5/9 Secondary reference Bristol Industries, Llc |
| 03A137-6L | 5/9 Secondary reference U.S. Government activity |
| 03A1376L | 5/9 Secondary reference Defense Logistics Agency Dba Defense Supply Center Philadelphia |
| 03A137-6L | 5/9 Secondary reference U.S. Government activity |
| KFN526L-6 | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
NSN 5310-01-352-8802 is a Nut,self-Locking,extended Washer, manufactured by Bristol Industries, Llc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-352-8802 has 4 manufacturer part numbers on file: KFN526L-6 (Bristol Industries, Llc), KFN526L-6 (Howmet Global Fastening Systems Inc), KFN526L-6 (Sps Technologies, Llc Dba PB Fasteners), 03A137-6L (Northrop Grumman Systems Corp Dba Northrop Grumman Computing Systems).
Key specifications for KFN526L-6: Overall Height: 0.470 INCHES NOMINAL IN; Washer Outside Diameter: 0.675 INCHES MINIMUM AND 0.685 INCHES MAXIMUM IN; Width Across Flats: 0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM IN; Surface Treatment Document and Classification: MIL-L-8937 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL. 16 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.