The Washer,key, cataloged under National Stock Number 5310-00-161-9723, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Cummins Inc.. 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-161-9723 |
| Primary Part Number | 168638 |
| Item Name | Washer,key |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Cummins Inc. |
| Status | ACTIVE |
| Distance From Centerline to Inside of Prebent Key | 0.805 INCHES MINIMUM AND 0.815 INCHES MAXIMUM IN |
| External Prebent Key Length | 0.497 INCHES MINIMUM AND 0.507 INCHES MAXIMUM IN |
| Overall Distance Including Keys | 1.888 INCHES MINIMUM AND 1.898 INCHES MAXIMUM IN |
| Material Thickness | 0.083 INCHES NOMINAL IN |
| External Key Quantity | 1 |
| External Prebent Key Width | 1.500 INCHES NOMINAL IN |
| Angle Between External Keys | 60.0 DEGREES NOMINAL |
| Hole Diameter | 1.031 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 |
|---|---|
| 168638 PRIMARY | Cummins Inc. (USA) |
NSN 5310-00-161-9723 is a Washer,key, manufactured by Cummins Inc., classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-161-9723 has 1 manufacturer part number on file: 168638 (Cummins Inc.).
Key specifications for 168638: Distance From Centerline to Inside of Prebent Key: 0.805 INCHES MINIMUM AND 0.815 INCHES MAXIMUM IN; External Prebent Key Length: 0.497 INCHES MINIMUM AND 0.507 INCHES MAXIMUM IN; Overall Distance Including Keys: 1.888 INCHES MINIMUM AND 1.898 INCHES MAXIMUM IN; Material Thickness: 0.083 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.