The Nut,self-Locking,extended Washer, cataloged under National Stock Number 5310-01-328-2044, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Northrop Grumman Systems Corp Dba Northrop Grumman Computing Systems. Government technical data includes 16 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-328-2044 |
| Primary Part Number | 03A137-8L |
| Item Name | Nut,self-Locking,extended Washer |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Northrop Grumman Systems Corp Dba Northrop Grumman Computing Systems |
| Status | ACTIVE |
| Washer Outside Diameter | 0.654 INCHES NOMINAL IN |
| Width Across Flats | 0.553 INCHES MINIMUM AND 0.564 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE WASHER |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE NUT |
| Thread Series | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Washer Thickness | 0.225 INCHES MINIMUM AND 0.235 INCHES MAXIMUM IN |
| Material Document and Classification | AMS5734 ASSN STD SINGLE MATERIAL RESPONSE OR AMS5736 ASSN STD SINGLE MATERIAL RESPONSE NUT |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.500 INCHES IN |
| Locking Feature | PREVAILING TORQUE ALL METAL DESIGN |
| Surface Treatment | PASSIVATE WASHER |
| Surface Treatment | PASSIVATE NUT |
| Nut Style | HEXAGON |
| Thread Class | 3B |
| Thread Quantity Per Inch | 20 |
| Material | STEEL CORROSION RESISTING NUT |
| 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 |
|---|---|
| 03A137-8L | Sps Technologies, Llc Dba PB Fasteners (USA) |
| KFN526L-8 | Howmet Global Fastening Systems Inc (USA) |
| 03A137-8L PRIMARY | Northrop Grumman Systems Corp Dba Northrop Grumman Computing Systems (USA) |
| BH137M8 | Bristol Industries, Llc (USA) |
| KFN526L-8 | Huck International, Inc (USA) |
| Reference | Meaning |
|---|---|
| KFN526L-8 | 5/9 Secondary reference U.S. Government activity |
| KFN526L-8 | 5/9 Secondary reference U.S. Government activity |
| KFN526DL8 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| KFN526L-8 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| KFN526DL8 | 5/9 Secondary reference Howmet Global Fastening Systems Inc |
NSN 5310-01-328-2044 is a Nut,self-Locking,extended Washer, manufactured by Northrop Grumman Systems Corp Dba Northrop Grumman Computing Systems, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-328-2044 has 5 manufacturer part numbers on file: 03A137-8L (Sps Technologies, Llc Dba PB Fasteners), KFN526L-8 (Howmet Global Fastening Systems Inc), 03A137-8L (Northrop Grumman Systems Corp Dba Northrop Grumman Computing Systems), BH137M8 (Bristol Industries, Llc), KFN526L-8 (Huck International, Inc).
Key specifications for 03A137-8L: Overall Height: 0.615 INCHES NOMINAL IN; Washer Outside Diameter: 0.654 INCHES NOMINAL IN; Width Across Flats: 0.553 INCHES MINIMUM AND 0.564 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE WASHER. 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.