The Nut,self-Locking,cap, cataloged under National Stock Number 5310-01-100-5203, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. Government technical data includes 18 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-100-5203 |
| Item Name | Nut,self-Locking,cap |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Lubrication | DRY FILM LUBRICANT |
| Width Across Flats | 0.551 INCHES MINIMUM AND 0.562 INCHES MAXIMUM IN |
| Bearing Surface Finish | 110.0 MICROINCHES |
| Surface Treatment Document and Classification | QQ-P-35,TY 2 FED SPEC SINGLE TREATMENT RESPONSE NUT |
| Thread Series | UNF |
| Temp Rating | 250.0 FAHRENHEIT MAXIMUM DEGF |
| Material Document and Classification | 66 FED STD ALL MATERIAL RESPONSES NUT |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.375 INCHES IN |
| Locking Feature | PREVAILING TORQUE WITH NONMETALLIC INSERT OR PREVAILING TORQUE ALL METAL DESIGN |
| Nut Height | 0.625 INCHES NOMINAL IN |
| Surface Treatment | PASSIVATE NUT |
| Nut Style | CAP |
| Thread Class | 2B |
| Thread Quantity Per Inch | 24 |
| Material | PLASTIC LOCKING INSERT |
| Material | STEEL COMP 303 OR STEEL COMP 302 OR STEEL COMP 304 OR STEEL COMP 305 OR STEEL COMP 316 OR STEEL COMP 317 OR STEEL COMP 347 OR STEEL COMP 310 OR STEEL COMP 321 OR STEEL COMP 309 OR STEEL COMP 304L OR STEEL COMP 316L NUT |
| Bearing Surface Type | CHAMFERED |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| MS51865-12C | 2/2 Government specification standardization U.S. Government activity |
NSN 5310-01-100-5203 is a Nut,self-Locking,cap, classified under FSC 5310, Nuts and Washers. Status: active.
Key specifications for 5310-01-100-5203: Lubrication: DRY FILM LUBRICANT; Width Across Flats: 0.551 INCHES MINIMUM AND 0.562 INCHES MAXIMUM IN; Bearing Surface Finish: 110.0 MICROINCHES; Surface Treatment Document and Classification: QQ-P-35,TY 2 FED SPEC SINGLE TREATMENT RESPONSE NUT. 18 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.