The Washer,flat, cataloged under National Stock Number 5310-01-259-7781, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Lockheed Martin Corp. Government technical data includes 6 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-259-7781 |
| Primary Part Number | 863T0180726-002 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Lockheed Martin Corp |
| Status | ACTIVE |
| Overall Diameter | 5.000 INCHES NOMINAL IN |
| Cross-Sectional Shape Style | RECTANGULAR |
| Peripheral Shape Style | ROUND |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 3.760 INCHES NOMINAL IN |
| Thickness | 0.250 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 |
|---|---|
| 863T0180726-002 PRIMARY | Lockheed Martin Corp (USA) |
| Reference | Meaning |
|---|---|
| 863T0180726-002 | 5/9 Secondary reference Lockheed Martin Corp |
| 863T0180726 | D/9 Drawing number reference only Lockheed Martin Corp |
| 863T0180726 | D/9 Drawing number reference only Lockheed Martin Corp |
NSN 5310-01-259-7781 is a Washer,flat, manufactured by Lockheed Martin Corp, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-259-7781 has 1 manufacturer part number on file: 863T0180726-002 (Lockheed Martin Corp).
Key specifications for 863T0180726-002: Overall Diameter: 5.000 INCHES NOMINAL IN; Cross-Sectional Shape Style: RECTANGULAR; Peripheral Shape Style: ROUND; Center Hole Shape Style: ROUND. 6 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.