The Washer,flat, cataloged under National Stock Number 5310-01-303-2840, 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 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-303-2840 |
| Primary Part Number | 5167865 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Center Hole Width | 0.260 INCHES NOMINAL IN |
| Center Hole Length | 0.531 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | ASTM B633,TYPE 2,CLASS SC4 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| Overall Diameter | 1.068 INCHES MINIMUM AND 1.078 INCHES MAXIMUM IN |
| Material Document and Classification | ASTM A575 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Surface Treatment | ZINC AND CHROMATE OVERALL |
| Peripheral Shape Style | ROUND |
| Material | STEEL COMP 1020 OVERALL |
| Center Hole Shape Style | RECTANGULAR |
| Thickness | 0.125 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 |
|---|---|
| 5167865 PRIMARY | Naval Sea Systems Command (USA) |
NSN 5310-01-303-2840 is a Washer,flat, manufactured by Naval Sea Systems Command, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-303-2840 has 1 manufacturer part number on file: 5167865 (Naval Sea Systems Command).
Key specifications for 5167865: Center Hole Width: 0.260 INCHES NOMINAL IN; Center Hole Length: 0.531 INCHES NOMINAL IN; Surface Treatment Document and Classification: ASTM B633,TYPE 2,CLASS SC4 ASSN STD SINGLE TREATMENT RESPONSE OVERALL; Overall Diameter: 1.068 INCHES MINIMUM AND 1.078 INCHES MAXIMUM IN. 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.