The Nut,self-Locking,extended Washer, cataloged under National Stock Number 5310-01-660-3133, 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 15 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-660-3133 |
| Primary Part Number | BH00620M08 |
| Item Name | Nut,self-Locking,extended Washer |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Bristol Industries, Llc |
| Status | ACTIVE |
| Washer Outside Diameter | 0.290 INCHES MAXIMUM IN |
| Width Across Flats | 0.212 INCHES MINIMUM AND 0.220 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Series | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Washer Thickness | 0.102 INCHES MINIMUM AND 0.112 INCHES MAXIMUM IN |
| Material Document and Classification | AMS 5643 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.164 INCHES IN |
| Counterbore Diameter | 0.198 INCHES MINIMUM AND 0.202 INCHES MAXIMUM WASHER IN |
| Locking Feature | PREVAILING TORQUE ALL METAL DESIGN |
| Surface Treatment | PASSIVATE OVERALL |
| Nut Style | HEXAGON |
| Thread Class | 3B |
| Thread Quantity Per Inch | 32 |
| Material | STEEL COMP 630 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 |
|---|---|
| BH00620M08 PRIMARY | Bristol Industries, Llc (USA) |
| KFN668-08 PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| KFN668-08 PRIMARY | Huck International, Inc (USA) |
| KFN668-08 PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| LE114-0031-0002 | 7/2 Vendor item drawing reference The Boeing Company Div Legacy Am&m |
| KFN668-08 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5310-01-660-3133 is a Nut,self-Locking,extended Washer, manufactured by Bristol Industries, Llc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-660-3133 has 4 manufacturer part numbers on file: BH00620M08 (Bristol Industries, Llc), KFN668-08 (Howmet Global Fastening Systems Inc), KFN668-08 (Huck International, Inc), KFN668-08 (Sps Technologies, Llc Dba PB Fasteners).
Key specifications for BH00620M08: Overall Height: 0.270 INCHES MAXIMUM IN; Washer Outside Diameter: 0.290 INCHES MAXIMUM IN; Width Across Flats: 0.212 INCHES MINIMUM AND 0.220 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL. 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.