The Washer,flat, cataloged under National Stock Number 5310-01-439-8182, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Api Heat Transfer Thermasys Corporation. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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.
| Item Name | Washer,flat |
| FSC / FSG | 5310 — Nuts and Washers (FSG 53) |
| Manufacturers | Api Heat Transfer Thermasys Corporation (CAGE 4C8A9) |
| Parameter | Value |
|---|---|
| NSN | 5310-01-439-8182 |
| Primary Part Number | 71401 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Api Heat Transfer Thermasys Corporation |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Part Number | Manufacturer |
|---|---|
| 71401 PRIMARY | Api Heat Transfer Thermasys Corporation (USA) |
| Reference | Meaning |
|---|---|
| 71401 | 3/9 Design control — primary reference Thermasys Corporation Dba General Thermo Dynamics Div General Thermodynamics Div |
NSN 5310-01-439-8182 is a Washer,flat, manufactured by Api Heat Transfer Thermasys Corporation, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-439-8182 has 1 manufacturer part number on file: 71401 (Api Heat Transfer Thermasys Corporation).
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.