The Washer,key, cataloged under National Stock Number 5310-00-409-1813, 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 7 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-409-1813 |
| Primary Part Number | 4L3754 |
| Item Name | Washer,key |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Caterpillar Inc Div Caterpillar Defense |
| Status | ACTIVE |
| Distance From Centerline to End of Longest Key | 0.880 INCHES NOMINAL IN |
| Distance From Centerline to Inside of Prebent Key | 0.500 INCHES NOMINAL IN |
| Overall Distance Including Keys | 1.220 INCHES NOMINAL IN |
| Material Thickness | 0.035 INCHES NOMINAL IN |
| External Straight Key Width | 0.740 INCHES NOMINAL IN |
| Material | STEEL OVERALL |
| Hole Diameter | 0.531 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 |
|---|---|
| 4L3754 PRIMARY | Caterpillar Inc Div Caterpillar Defense (USA) |
NSN 5310-00-409-1813 is a Washer,key, manufactured by Caterpillar Inc Div Caterpillar Defense, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-409-1813 has 1 manufacturer part number on file: 4L3754 (Caterpillar Inc Div Caterpillar Defense).
Key specifications for 4L3754: Distance From Centerline to End of Longest Key: 0.880 INCHES NOMINAL IN; Distance From Centerline to Inside of Prebent Key: 0.500 INCHES NOMINAL IN; Overall Distance Including Keys: 1.220 INCHES NOMINAL IN; Material Thickness: 0.035 INCHES NOMINAL IN. 7 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.