The Loose Doubler, cataloged under National Stock Number 2040-01-458-9021, is classified within Federal Supply Class 2040 (Marine Hardware and Hull Items) of the Ship and Marine Equipment group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 2 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 6 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2040-01-458-9021 |
| Primary Part Number | 6981356 FIND NO. 57 |
| Item Name | Loose Doubler |
| FSC / FSG | 2040 / 20 — Marine Hardware and Hull Items |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| General Characteristics Item Description | TYPE 3 MATERIAL |
| Surface Treatment | PAINT |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 6981356 FIND NO. 57 PRIMARY | Naval Sea Systems Command (USA) |
| 6981356-065 | Smr Acquisition Llc (USA) |
| 6981356-065 PRIMARY | Aef-Performance Llc (USA) |
| Reference | Meaning |
|---|---|
| 6981356 | D/9 Drawing number reference only Naval Sea Systems Command |
| 6981356-065 | 5/1 Secondary reference Naval Sea Systems Command |
NSN 2040-01-458-9021 is a Loose Doubler, manufactured by Naval Sea Systems Command, classified under FSC 2040, Marine Hardware and Hull Items. Status: active.
NSN 2040-01-458-9021 has 3 manufacturer part numbers on file: 6981356 FIND NO. 57 (Naval Sea Systems Command), 6981356-065 (Smr Acquisition Llc), 6981356-065 (Aef-Performance Llc).
6 possible matches (shared part number, not a government interchangeability claim): 2040-01-508-3544, 2040-01-508-3552, 2040-01-508-3555. Verify interchangeability with system specifications before substitution.
Key specifications for 6981356 FIND NO. 57: General Characteristics Item Description: TYPE 3 MATERIAL; Surface Treatment: PAINT. 2 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.
NSN 2040-01-458-9021 has DEMIL Code Q. Demilitarization may be required before disposal or transfer to non-military entities.
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.