The Cap,protective,dust and Moisture, cataloged under National Stock Number 5340-01-669-3253, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. The manufacturer of record is Nkk Switches of America Inc. Government technical data includes 1 specification, 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5340-01-669-3253 |
| Primary Part Number | AT401S |
| Item Name | Cap,protective,dust and Moisture |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Manufacturer | Nkk Switches of America Inc |
| Status | ACTIVE |
| Material | RUBBER SILICONE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 633-AT401S | Mouser Electronics, Inc Dba Mouser Electronics (USA) |
| AT401S PRIMARY | Nkk Switches of America Inc (USA) |
| Reference | Meaning |
|---|---|
| 633-AT401S | 5/9 Secondary reference Mouser Electronics Nordic Ab |
NSN 5340-01-669-3253 is a Cap,protective,dust and Moisture, manufactured by Nkk Switches of America Inc, classified under FSC 5340, Hardware, Commercial. Status: active.
NSN 5340-01-669-3253 has 2 manufacturer part numbers on file: 633-AT401S (Mouser Electronics, Inc Dba Mouser Electronics), AT401S (Nkk Switches of America Inc).
Key specifications for AT401S: Part Name Assigned by Controlling Agency: TOGGLE; Material: RUBBER SILICONE. 1 specification is documented in the U.S. Government catalog.
Possible hazard — SDS may be required (DLA HMIC P). 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.