The Cap,protective,dust and Moisture, cataloged under National Stock Number 5340-00-720-6393, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. The manufacturer of record is Pro-Tec Products. Government technical data includes 7 specifications, cited from the U.S. Government catalog. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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.
| Parameter | Value |
|---|---|
| NSN | 5340-00-720-6393 |
| Primary Part Number | MST-261 |
| Item Name | Cap,protective,dust and Moisture |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Manufacturer | Pro-Tec Products |
| Status | ACTIVE |
| Design Type | THREADED |
| Overall Diameter | 2.063 INCHES NOMINAL IN |
| Thread Class | 2B |
| Material | PLASTIC |
| Thread Size and Series/type Designator | 1-7/8 IN.-12 UN IN |
| Inside Diameter Length | 0.563 INCHES NOMINAL IN |
| Round Cap Outside Surface Condition | RIBBED |
| 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 |
|---|---|
| MST-261 PRIMARY | Pro-Tec Products (USA) |
| Reference | Meaning |
|---|---|
| 1604-261Y | 3/9 Design control — primary reference U.S. Government activity |
NSN 5340-00-720-6393 is a Cap,protective,dust and Moisture, manufactured by Pro-Tec Products, classified under FSC 5340, Hardware, Commercial. Status: active.
NSN 5340-00-720-6393 has 1 manufacturer part number on file: MST-261 (Pro-Tec Products).
Key specifications for MST-261: Design Type: THREADED; Overall Diameter: 2.063 INCHES NOMINAL IN; Thread Class: 2B; Material: PLASTIC. 7 specifications are 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.