The Washer,flat, cataloged under National Stock Number 5310-01-579-8977, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Caterpillar Inc Div Caterpillar Defense. Government technical data includes 7 specifications, cited from the U.S. Government catalog. The record lists 3 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5310-01-579-8977 |
| Primary Part Number | 6443619-200M1 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Caterpillar Inc Div Caterpillar Defense |
| Status | ACTIVE |
| Overall Diameter | 40.0 MILLIMETERS NOMINAL MM |
| Cross-Sectional Shape Style | RECTANGULAR |
| Surface Treatment | PAINT OVERALL |
| Peripheral Shape Style | ROUND |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 13.0 MILLIMETERS NOMINAL MM |
| Thickness | 6.4 MILLIMETERS NOMINAL MM |
| 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 |
|---|---|
| 6443619-200M1 PRIMARY | Caterpillar Inc Div Caterpillar Defense (USA) |
| 6443619-200M1 | Amz Alabama Inc. (USA) |
| 6443619-200M1 PRIMARY | Bae Systems Land & Armaments L.p. (USA) |
| Reference | Meaning |
|---|---|
| 6443619-200M1 | 3/9 Design control — primary reference Bae Systems Survivability Systems Llc |
NSN 5310-01-579-8977 is a Washer,flat, manufactured by Caterpillar Inc Div Caterpillar Defense, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-579-8977 has 3 manufacturer part numbers on file: 6443619-200M1 (Caterpillar Inc Div Caterpillar Defense), 6443619-200M1 (Amz Alabama Inc.), 6443619-200M1 (Bae Systems Land & Armaments L.p.).
Key specifications for 6443619-200M1: Overall Diameter: 40.0 MILLIMETERS NOMINAL MM; Cross-Sectional Shape Style: RECTANGULAR; Special Features: COLOR: TAN; Surface Treatment: PAINT 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.