The Nut,self-Locking,extended Washer, cataloged under National Stock Number 5310-00-945-0838, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney. Government technical data includes 13 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5310-00-945-0838 |
| Primary Part Number | 489166 |
| Item Name | Nut,self-Locking,extended Washer |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney |
| Status | ACTIVE |
| Washer Outside Diameter | 0.485 INCHES MINIMUM AND 0.515 INCHES MAXIMUM IN |
| Width Across Flats | 0.368 INCHES MINIMUM AND 0.377 INCHES MAXIMUM IN |
| Thread Series | UNF |
| Thread Pitch Diameters | +0.2720 TO 0.2800 INCHES IN |
| Washer Thickness | 0.055 INCHES MINIMUM AND 0.065 INCHES MAXIMUM IN |
| Material Document and Classification | AMS 6322 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.312 INCHES IN |
| Locking Feature | PREVAILING TORQUE ALL METAL DESIGN |
| Surface Treatment | CADMIUM OVERALL |
| Nut Style | DOUBLE HEXAGON |
| Thread Quantity Per Inch | 24 |
| Material | 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 |
NSN 5310-00-945-0838 is a Nut,self-Locking,extended Washer, manufactured by Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-945-0838 has 2 manufacturer part numbers on file: 489166 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney), 489166 (Esna, Llc).
1 possible match (shared part number, not a government interchangeability claim): 4140-01-100-7636. Verify interchangeability with system specifications before substitution.
Key specifications for 489166: Overall Height: 0.350 INCHES MINIMUM AND 0.360 INCHES MAXIMUM IN; Washer Outside Diameter: 0.485 INCHES MINIMUM AND 0.515 INCHES MAXIMUM IN; Width Across Flats: 0.368 INCHES MINIMUM AND 0.377 INCHES MAXIMUM IN; Thread Series: UNF. 13 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.