The Washer,shouldered, cataloged under National Stock Number 5310-00-083-7402, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Caterpillar Inc Div Caterpillar Defense. Government technical data includes 8 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 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 | 5310-00-083-7402 |
| Primary Part Number | 2N4378 |
| Item Name | Washer,shouldered |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Caterpillar Inc Div Caterpillar Defense |
| Status | ACTIVE |
| Shoulder Height | 0.094 INCHES NOMINAL IN |
| Style Designator | SHOULDERED |
| Material Document and Classification | 1E303,FSCM 11083 MFR REF SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 0.690 INCHES NOMINAL IN |
| Material Thickness | 0.109 INCHES NOMINAL IN |
| Shoulder Diameter | 0.500 INCHES NOMINAL IN |
| Material | STEEL OVERALL |
| Hole Diameter | 0.328 INCHES NOMINAL 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 |
|---|---|
| 2N4378 PRIMARY | Caterpillar Inc Div Caterpillar Defense (USA) |
NSN 5310-00-083-7402 is a Washer,shouldered, manufactured by Caterpillar Inc Div Caterpillar Defense, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-083-7402 has 1 manufacturer part number on file: 2N4378 (Caterpillar Inc Div Caterpillar Defense).
1 possible match (shared part number, not a government interchangeability claim): 5961-01-270-6150. Verify interchangeability with system specifications before substitution.
Key specifications for 2N4378: Shoulder Height: 0.094 INCHES NOMINAL IN; Style Designator: SHOULDERED; Material Document and Classification: 1E303,FSCM 11083 MFR REF SINGLE MATERIAL RESPONSE OVERALL; Outside Diameter: 0.690 INCHES NOMINAL IN. 8 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.