The Washer,key, cataloged under National Stock Number 5310-01-166-4546, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Bsi Standards Limited. Government technical data includes 10 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-166-4546 |
| Primary Part Number | SP109G |
| Item Name | Washer,key |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Bsi Standards Limited |
| Status | ACTIVE |
| Distance From Centerline to Inside of Prebent Key | 0.325 INCHES MINIMUM AND 0.335 INCHES MAXIMUM IN |
| External Prebent Key Length | 0.100 INCHES MINIMUM AND 0.110 INCHES MAXIMUM IN |
| Style Designator | 270 DEGREE LOCKING KEY |
| Outside Diameter | 0.495 INCHES MINIMUM AND 0.505 INCHES MAXIMUM IN |
| External Tapered Key Width | 0.280 INCHES MINIMUM AND 0.290 INCHES MAXIMUM IN |
| External Prebent Key Angle | 15.0 DEGREES NOMINAL |
| Surface Treatment | CADMIUM OVERALL |
| Material | STEEL OVERALL |
| Angle Between External Keys | 58.0 DEGREES MINIMUM AND 62.0 DEGREES MAXIMUM |
| Hole Diameter | 0.320 INCHES MINIMUM AND 0.325 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 |
|---|---|
| SP109G PRIMARY | Bsi Standards Limited (GBR) |
| Reference | Meaning |
|---|---|
| 99-943-6213 | 6/9 Informative reference only Nato Stock Number Potential Interchangeability Link |
| 99-943-6213 | 6/9 Informative reference only U.S. Government activity |
NSN 5310-01-166-4546 is a Washer,key, manufactured by Bsi Standards Limited, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-166-4546 has 1 manufacturer part number on file: SP109G (Bsi Standards Limited).
Key specifications for SP109G: Distance From Centerline to Inside of Prebent Key: 0.325 INCHES MINIMUM AND 0.335 INCHES MAXIMUM IN; External Prebent Key Length: 0.100 INCHES MINIMUM AND 0.110 INCHES MAXIMUM IN; Style Designator: 270 DEGREE LOCKING KEY; Outside Diameter: 0.495 INCHES MINIMUM AND 0.505 INCHES MAXIMUM IN. 10 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.