The Nut,self-Locking,hexagon, cataloged under National Stock Number 5310-01-025-9991, 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18 specifications, cited from the U.S. Government catalog. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-025-9991 |
| Item Name | Nut,self-Locking,hexagon |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Width Across Flats | 2.715 INCHES MINIMUM AND 2.762 INCHES MAXIMUM IN |
| Bearing Surface Finish | 125.0 MICROINCHES |
| Surface Treatment Document and Classification | QQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL EXCEPT INSERT |
| Thread Series | UNIFIED NATIONAL COARSE (UNC) |
| Temp Rating | 250.0 FAHRENHEIT NOMINAL DEGF |
| Material Document and Classification | 66,A1A1/SAE 1141 FED STD SINGLE MATERIAL RESPONSE CAP |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 1.750 INCHES IN |
| Locking Feature | PREVAILING TORQUE WITH NONMETALLIC INSERT |
| Nut Height | 2.250 INCHES MINIMUM AND 2.376 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM OVERALL EXCEPT INSERT |
| Countersink Angle | 88.0 DEGREES NOMINAL NUT |
| Nut Style | HEXAGON |
| Thread Class | 3B |
| Thread Quantity Per Inch | 5 |
| Material | PLASTIC POLYHEXAMETHYLENE AMIDE LOCKING INSERT |
| Material | STEEL COMP 1137 NUT |
| Bearing Surface Type | CHAMFERED OR WASHER FACED |
| 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 |
|---|---|
| F52NU1610-285 | 5/9 Secondary reference Harvard Industries Inc |
| MS17829-28C | 2/2 Government specification standardization U.S. Government activity |
| F52NU1610-285 | 5/1 Secondary reference Esna, Llc |
| MS17829-28C | 5/1 Secondary reference U.S. Government activity |
| F52N7582-2805 | 5/1 Secondary reference Greer Stop Nut, Inc. |
NSN 5310-01-025-9991 is a Nut,self-Locking,hexagon, classified under FSC 5310, Nuts and Washers. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 5310-01-283-2761. Verify interchangeability with system specifications before substitution.
Key specifications for 5310-01-025-9991: Width Across Flats: 2.715 INCHES MINIMUM AND 2.762 INCHES MAXIMUM IN; Bearing Surface Finish: 125.0 MICROINCHES; Surface Treatment Document and Classification: QQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL EXCEPT INSERT; Thread Series: UNIFIED NATIONAL COARSE (UNC). 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.