The Nut,self-Locking,extended Washer, cataloged under National Stock Number 5310-01-289-4416, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Howmet Global Fastening Systems Inc. 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through both NSN and commercial part number lookups. 11 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-289-4416 |
| Primary Part Number | KFN668-3 |
| Item Name | Nut,self-Locking,extended Washer |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Howmet Global Fastening Systems Inc |
| Status | ACTIVE |
| Lubrication | DRY FILM LUBRICANT |
| Washer Outside Diameter | 0.330 INCHES MAXIMUM IN |
| Width Across Flats | 0.243 INCHES MINIMUM AND 0.251 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Series | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Material Document and Classification | AMS 5643 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nut Counterbore Depth | 0.102 INCHES MINIMUM AND 0.112 INCHES MAXIMUM WASHER IN |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.190 INCHES IN |
| Counterbore Diameter | 0.224 INCHES MINIMUM AND 0.228 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 |
|---|---|
| KFN668-3 | Huck International, Inc (USA) |
| KFN668-3 PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| BH00620M3 | Bristol Industries, Llc (USA) |
| KFN668-3 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| LE114-0031-0003 | 7/2 Vendor item drawing reference The Boeing Company Div Legacy Am&m |
| LE114-0031-0003 | 5/9 Secondary reference Howmet Global Fastening Systems Inc |
| MN40-3 | 5/9 Secondary reference Hi-Shear Corporation |
| MN40-3 | 5/9 Secondary reference Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc |
| KFN598-3 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| KFN668-3 | 5/2 Secondary reference U.S. Government activity |
| KFN598-3 | 5/9 Secondary reference Howmet Global Fastening Systems Inc |
| LE114-0031-0003 | 5/9 Secondary reference Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc |
| LE114-0031-0003 | 5/9 Secondary reference Hi-Shear Corporation |
| KFN517DL3 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| BH00908-3 | 5/9 Secondary reference Bristol Industries, Llc |
NSN 5310-01-289-4416 is a Nut,self-Locking,extended Washer, manufactured by Howmet Global Fastening Systems Inc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-289-4416 has 4 manufacturer part numbers on file: KFN668-3 (Huck International, Inc), KFN668-3 (Howmet Global Fastening Systems Inc), BH00620M3 (Bristol Industries, Llc), KFN668-3 (Sps Technologies, Llc Dba PB Fasteners).
Key specifications for KFN668-3: Lubrication: DRY FILM LUBRICANT; Overall Height: 0.280 INCHES MAXIMUM IN; Washer Outside Diameter: 0.330 INCHES MAXIMUM IN; Width Across Flats: 0.243 INCHES MINIMUM AND 0.251 INCHES MAXIMUM IN. 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.