The Washer,flat, cataloged under National Stock Number 5310-01-283-3563, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Kovatch Corp.. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-283-3563 |
| Primary Part Number | 039-90010-48 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Kovatch Corp. |
| Status | ACTIVE |
| Overall Diameter | 0.688 INCHES NOMINAL IN |
| Cross-Sectional Shape Style | RECTANGULAR |
| Peripheral Shape Style | ROUND |
| Material | COPPER ALLOY OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.406 INCHES NOMINAL IN |
| Thickness | 0.040 INCHES MINIMUM AND 0.060 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 | X |
| Part Number | Manufacturer |
|---|---|
| 039-90010-48 PRIMARY | Kovatch Corp. (USA) |
| Reference | Meaning |
|---|---|
| H450000 | 5/2 Secondary reference U.S. Government activity |
NSN 5310-01-283-3563 is a Washer,flat, manufactured by Kovatch Corp., classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-283-3563 has 1 manufacturer part number on file: 039-90010-48 (Kovatch Corp.).
Key specifications for 039-90010-48: Overall Diameter: 0.688 INCHES NOMINAL IN; Cross-Sectional Shape Style: RECTANGULAR; Peripheral Shape Style: ROUND; Material: COPPER ALLOY OVERALL. 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.