The Nut,self-Locking,extended Washer, cataloged under National Stock Number 5310-01-028-3295, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-028-3295 |
| Primary Part Number | 4902273 |
| Item Name | Nut,self-Locking,extended Washer |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier |
| Status | ACTIVE |
| Washer Outside Diameter | 0.367 INCHES MINIMUM AND 0.373 INCHES MAXIMUM IN |
| Width Across Flats | 0.213 INCHES MINIMUM AND 0.221 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Series | UNIFIED NATIONAL COARSE (UNC) |
| Washer Thickness | 0.027 INCHES MINIMUM AND 0.037 INCHES MAXIMUM IN |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.164 INCHES IN |
| Locking Feature | PREVAILING TORQUE ALL METAL DESIGN |
| Surface Treatment | CADMIUM OVERALL |
| Countersink Angle | 90.0 DEGREES NOMINAL NUT |
| Nut Style | HEXAGON |
| Thread Class | 3B |
| Thread Quantity Per Inch | 32 |
| Material | STEEL COMP E4340 OR STEEL COMP 8740 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 |
|---|---|
| 4902273 PRIMARY | Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier (USA) |
| 4902273 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| LH8639-2 | 5/9 Secondary reference Harvard Industries Inc |
| LH8639-2 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
NSN 5310-01-028-3295 is a Nut,self-Locking,extended Washer, manufactured by Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-028-3295 has 2 manufacturer part numbers on file: 4902273 (Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier), 4902273 (Sps Technologies, Llc Dba PB Fasteners).
Key specifications for 4902273: Overall Height: 0.301 INCHES MINIMUM AND 0.316 INCHES MAXIMUM IN; Washer Outside Diameter: 0.367 INCHES MINIMUM AND 0.373 INCHES MAXIMUM IN; Width Across Flats: 0.213 INCHES MINIMUM AND 0.221 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL. 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.