The Washer,recessed, cataloged under National Stock Number 5310-01-239-5073, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 4 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-239-5073 |
| Primary Part Number | SS845-2050957 PIECE 19 |
| Item Name | Washer,recessed |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Material Document and Classification | MIL-B-21230 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 6.493 INCHES MINIMUM AND 6.496 INCHES MAXIMUM IN |
| Material | COPPER ALLOY 955 OVERALL |
| Hole Diameter | 5.812 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 |
|---|---|
| SS845-2050957 PIECE 19 | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 2640-390X2 PIECE 19 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5310-01-239-5073 is a Washer,recessed, manufactured by Naval Sea Systems Command, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-239-5073 has 1 manufacturer part number on file: SS845-2050957 PIECE 19 (Naval Sea Systems Command).
Key specifications for SS845-2050957 PIECE 19: Overall Height: 1.408 INCHES NOMINAL IN; Material Document and Classification: MIL-B-21230 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL; Outside Diameter: 6.493 INCHES MINIMUM AND 6.496 INCHES MAXIMUM IN; Part Name Assigned by Controlling Agency: NAVY SPECIAL PROJECT. 4 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.