The Washer,lock, cataloged under National Stock Number 5310-01-018-5476, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Ingersoll-Rand Company Dba Ingersoll-Rand Div Tool & Hoist Division. Government technical data includes 5 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-018-5476 |
| Primary Part Number | Y1-971 |
| Item Name | Washer,lock |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Ingersoll-Rand Company Dba Ingersoll-Rand Div Tool & Hoist Division |
| Status | ACTIVE |
| Style Designator | FLAT INTERNAL TEETH |
| Outside Diameter | 1.921 INCHES MINIMUM AND 1.921 INCHES MINIMUM AND 1.975 INCHES MAXIMUM1.975 INCHES MAXIMUM IN |
| Material Thickness | 0.059 INCHES MINIMUM AND 0.059 INCHES MINIMUM AND 0.067 INCHES MAXIMUM0.067 INCHES MAXIMUM IN |
| Material | STEEL OVERALL |
| Hole Diameter | 1.275 INCHES MINIMUM AND 1.275 INCHES MINIMUM AND 1.325 INCHES MAXIMUM1.325 INCHES MAXIMUM IN |
| 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 |
|---|---|
| Y1-971 PRIMARY | Ingersoll-Rand Company Dba Ingersoll-Rand Div Tool & Hoist Division (USA) |
| Reference | Meaning |
|---|---|
| Y1-971 | 3/9 Design control — primary reference Ingersoll-Rand Company Dba Ingersoll-Rand |
NSN 5310-01-018-5476 is a Washer,lock, manufactured by Ingersoll-Rand Company Dba Ingersoll-Rand Div Tool & Hoist Division, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-018-5476 has 1 manufacturer part number on file: Y1-971 (Ingersoll-Rand Company Dba Ingersoll-Rand Div Tool & Hoist Division).
Key specifications for Y1-971: Style Designator: FLAT INTERNAL TEETH; Outside Diameter: 1.921 INCHES MINIMUM AND 1.921 INCHES MINIMUM AND 1.975 INCHES MAXIMUM1.975 INCHES MAXIMUM IN; Material Thickness: 0.059 INCHES MINIMUM AND 0.059 INCHES MINIMUM AND 0.067 INCHES MAXIMUM0.067 INCHES MAXIMUM IN; Material: STEEL OVERALL. 5 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.