The Washer,flat, cataloged under National Stock Number 5310-01-540-1537, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is General Dynamics Land Systems - Force Protection Inc. Dba Gdls Div Gdls-Fp. Government technical data includes 8 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-540-1537 |
| Primary Part Number | 4000220 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | General Dynamics Land Systems - Force Protection Inc. Dba Gdls Div Gdls-Fp |
| Status | ACTIVE |
| Overall Diameter | 1.50 INCHES NOMINAL IN |
| Cross-Sectional Shape Style | RECTANGULAR |
| Color | BLACK OVERALL |
| Peripheral Shape Style | ROUND |
| Material | STEEL OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 1.5 INCHES NOMINAL IN |
| Thickness | 0.18 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 |
|---|---|
| 4000220 | General Dynamics Land Systems - Force Protection Inc. Dba Gdls Div Gdls-Fp (USA) |
| HW78PT | Standen's Limited (CAN) |
| Reference | Meaning |
|---|---|
| HW78PT | 3/9 Design control — primary reference Detroit Steel Products Member Marmon Group of Companies |
NSN 5310-01-540-1537 is a Washer,flat, manufactured by General Dynamics Land Systems - Force Protection Inc. Dba Gdls Div Gdls-Fp, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-540-1537 has 2 manufacturer part numbers on file: 4000220 (General Dynamics Land Systems - Force Protection Inc. Dba Gdls Div Gdls-Fp), HW78PT (Standen's Limited).
Key specifications for 4000220: Overall Diameter: 1.50 INCHES NOMINAL IN; Cross-Sectional Shape Style: RECTANGULAR; Color: BLACK OVERALL; Peripheral Shape Style: ROUND. 8 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.