The Washer,flat, cataloged under National Stock Number 5310-01-364-1874, 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 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-364-1874 |
| Primary Part Number | 400-6537780-20 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Surface Treatment Document and Classification | ASTMB633 TY1 CL2 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| Overall Diameter | 0.812 INCHES NOMINAL IN |
| Surface Treatment | ZINC OVERALL |
| Peripheral Shape Style | ROUND |
| Material | STEEL OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.406 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 |
|---|---|
| 400-6537780-20 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 400 6537780 ITEM 20 | 5/9 Secondary reference Naval Sea Systems Command |
| M8830061 | 5/9 Secondary reference Naval Ship Engineering Center Philadelphia Division Submarine Antenna Quality Assurance |
NSN 5310-01-364-1874 is a Washer,flat, manufactured by Naval Sea Systems Command, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-364-1874 has 1 manufacturer part number on file: 400-6537780-20 (Naval Sea Systems Command).
Key specifications for 400-6537780-20: Surface Treatment Document and Classification: ASTMB633 TY1 CL2 ASSN STD SINGLE TREATMENT RESPONSE OVERALL; Overall Diameter: 0.812 INCHES NOMINAL IN; Surface Treatment: ZINC OVERALL; Peripheral Shape Style: ROUND. 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.