The Cap,protective,dust and Moisture, cataloged under National Stock Number 5340-01-391-6201, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. Government technical data includes 10 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active. Unit of issue: EA.
| Parameter | Value |
|---|---|
| NSN | 5340-01-391-6201 |
| Item Name | Cap,protective,dust and Moisture |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Status | ACTIVE |
| Surface Treatment Document and Classification | MIL-C-5541, CLASS 1A MIL SPEC SINGLE TREATMENT RESPONSE A |
| Design Type | THREADED |
| Tube Outside Diameter for Which Designed | 0.312 INCHES NOMINAL IN |
| Connector Nominal Thread Size for Which Designed | 0.500 INCHES IN |
| Surface Treatment | CHROMATE |
| Thread Class | 3B |
| Material | ALUMINUM ALLOY 3003 |
| Thread Size and Series/type Designator | 0.500-20 UNF |
| Inside Diameter Length | 0.500 INCHES NOMINAL IN |
| Round Cap Outside Surface Condition | KNURLED |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Unit of Issue | EA |
| Reference | Meaning |
|---|---|
| M5501/3-105G | 2/2 Government specification standardization U.S. Government activity |
| MIL-C-5501/3 | 4/1 Identification reference U.S. Government activity |
NSN 5340-01-391-6201 is a Cap,protective,dust and Moisture, classified under FSC 5340, Hardware, Commercial. Status: active.
Key specifications for 5340-01-391-6201: Surface Treatment Document and Classification: MIL-C-5541, CLASS 1A MIL SPEC SINGLE TREATMENT RESPONSE A; Design Type: THREADED; Tube Outside Diameter for Which Designed: 0.312 INCHES NOMINAL IN; Connector Nominal Thread Size for Which Designed: 0.500 INCHES IN. 10 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.