The Washer,key, cataloged under National Stock Number 5310-00-693-7719, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Undersea Sensor Systems Inc Div Ultra Sonobuoy Systems. Government technical data includes 11 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 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-693-7719 |
| Primary Part Number | 16818 |
| Item Name | Washer,key |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Undersea Sensor Systems Inc Div Ultra Sonobuoy Systems |
| Status | ACTIVE |
| Surface Treatment Document and Classification | QQ-P-416,TY 1,CL 1 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Distance From Centerline to Inside of Prebent Key | 0.0977 INCHES MINIMUM AND 0.0982 INCHES MAXIMUM IN |
| Internal Prebent Key Width | 0.045 INCHES MINIMUM AND 0.055 INCHES MAXIMUM IN |
| Style Designator | KEY |
| Material Document and Classification | QQ-B-613 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 0.484 INCHES MINIMUM AND 0.516 INCHES MAXIMUM IN |
| Material Thickness | 0.005 INCHES MINIMUM AND 0.015 INCHES MAXIMUM IN |
| Internal Prebent Key Length | 0.058 INCHES MINIMUM AND 0.068 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM OVERALL |
| Material | COPPER ALLOY OVERALL |
| Hole Diameter | 0.198 INCHES MINIMUM AND 0.208 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 |
|---|---|
| 16818 PRIMARY | Undersea Sensor Systems Inc Div Ultra Sonobuoy Systems (USA) |
NSN 5310-00-693-7719 is a Washer,key, manufactured by Undersea Sensor Systems Inc Div Ultra Sonobuoy Systems, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-693-7719 has 1 manufacturer part number on file: 16818 (Undersea Sensor Systems Inc Div Ultra Sonobuoy Systems).
2 possible matches (shared part number, not a government interchangeability claim): 1650-00-787-0946, 5340-01-014-3794. Verify interchangeability with system specifications before substitution.
Key specifications for 16818: Surface Treatment Document and Classification: QQ-P-416,TY 1,CL 1 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Distance From Centerline to Inside of Prebent Key: 0.0977 INCHES MINIMUM AND 0.0982 INCHES MAXIMUM IN; Internal Prebent Key Width: 0.045 INCHES MINIMUM AND 0.055 INCHES MAXIMUM IN; Style Designator: KEY. 11 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.