The Washer,flat, cataloged under National Stock Number 5310-01-480-9137, 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 10 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-480-9137 |
| Primary Part Number | 124-1678562 PC 656 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Surface Finish | 125.0 MICROINCHES BOTTOM |
| Surface Finish | 125.0 MICROINCHES TOP |
| Overall Diameter | 3.750 INCHES NOMINAL IN |
| Material Document and Classification | MIL-B-994 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Peripheral Shape Style | ROUND |
| Material | COPPER ALLOY OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 1.266 INCHES NOMINAL IN |
| Thickness | 0.188 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 |
|---|---|
| 124-1678550 PC 20 | Naval Sea Systems Command (USA) |
| 124-1678562 PC 656 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 1678550 | D/9 Drawing number reference only Naval Sea Systems Command |
NSN 5310-01-480-9137 is a Washer,flat, manufactured by Naval Sea Systems Command, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-480-9137 has 2 manufacturer part numbers on file: 124-1678550 PC 20 (Naval Sea Systems Command), 124-1678562 PC 656 (Naval Sea Systems Command).
1 possible match (shared part number, not a government interchangeability claim): 5310-01-481-2079. Verify interchangeability with system specifications before substitution.
Key specifications for 124-1678562 PC 656: Surface Finish: 125.0 MICROINCHES BOTTOM; Surface Finish: 125.0 MICROINCHES TOP; Overall Diameter: 3.750 INCHES NOMINAL IN; Material Document and Classification: MIL-B-994 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL. 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.