The Nut,self-Locking,round, cataloged under National Stock Number 5310-01-133-1099, 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. Div Microdot Products. Government technical data includes 14 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-133-1099 |
| Primary Part Number | KFN644-3 |
| Item Name | Nut,self-Locking,round |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Howmet Global Fastening Systems Inc. Div Microdot Products |
| Status | ACTIVE |
| Lubrication | DRY FILM LUBRICANT |
| 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) |
| Temp Rating | 450.0 FAHRENHEIT MAXIMUM DEGF |
| Hardness Rating | 39.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.190 INCHES IN |
| Nut Diameter | 0.315 INCHES MINIMUM AND 0.322 INCHES MAXIMUM IN |
| Locking Feature | PREVAILING TORQUE ALL METAL DESIGN |
| Nut Thickness | 0.260 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Thread Class | 3B |
| Thread Quantity Per Inch | 32 |
| 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 |
NSN 5310-01-133-1099 is a Nut,self-Locking,round, manufactured by Howmet Global Fastening Systems Inc. Div Microdot Products, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-133-1099 has 2 manufacturer part numbers on file: KFN644-3 (Howmet Global Fastening Systems Inc. Div Microdot Products), KFN644-3 (Howmet Global Fastening Systems Inc).
Key specifications for KFN644-3: Lubrication: DRY FILM LUBRICANT; 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); Temp Rating: 450.0 FAHRENHEIT MAXIMUM DEGF. 14 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.