The Washer,flat, cataloged under National Stock Number 5310-01-334-0877, 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 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 6 items share a part number with this NSN in the catalog (possible match — not a government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 | 5310-01-334-0877 |
| Primary Part Number | 6405342 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Surface Finish | 63.0 MICROINCHES ALL SURFACES |
| Overall Diameter | 0.855 INCHES MINIMUM AND 0.860 INCHES MAXIMUM IN |
| Criticality Code Justification | ZZZY |
| Cross-Sectional Shape Style | RECTANGULAR |
| Peripheral Shape Style | ROUND |
| Material | PLASTIC OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.625 INCHES MINIMUM AND 0.629 INCHES MAXIMUM IN |
| Reference Number Differentiating Characteristics | CLEANING, PACKAGING, AND MARKING IAW MIL-STD-1330D |
| Thickness | 0.060 INCHES MINIMUM AND 0.063 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 | S |
| Part Number | Manufacturer |
|---|---|
| 6405342 | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 211041873CP | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
| 801-6405342 FIND 5CP | 5/9 Secondary reference Naval Inventory Control Point Mechanicsburg |
| 211041873 | 3/1 Design control — primary reference Naval Sea Systems Command |
| 801-6405342 FIND 5 | 5/1 Secondary reference Naval Sea Systems Command |
NSN 5310-01-334-0877 is a Washer,flat, manufactured by Naval Sea Systems Command, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-334-0877 has 1 manufacturer part number on file: 6405342 (Naval Sea Systems Command).
6 possible matches (shared part number, not a government interchangeability claim): 4820-01-434-5463, 4820-01-434-5465, 4820-01-442-1967. Verify interchangeability with system specifications before substitution.
Key specifications for 6405342: Surface Finish: 63.0 MICROINCHES ALL SURFACES; Overall Diameter: 0.855 INCHES MINIMUM AND 0.860 INCHES MAXIMUM IN; Criticality Code Justification: ZZZY; Cross-Sectional Shape Style: RECTANGULAR. 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.