The Cap,protective,dust and Moisture, cataloged under National Stock Number 5340-01-439-6837, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. The manufacturer of record is Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier. Government technical data includes 9 specifications, 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. Current acquisition status: Active. Unit of issue: EA.
| Parameter | Value |
|---|---|
| NSN | 5340-01-439-6837 |
| Primary Part Number | 2042AS550-02 |
| Item Name | Cap,protective,dust and Moisture |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Manufacturer | Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier |
| Status | ACTIVE |
| Width Across Flats | 0.5790 INCHES MINIMUM AND 0.5870 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE |
| Design Type | THREADED |
| Connector Nominal Thread Size for Which Designed | 0.4375 INCHES IN |
| Surface Treatment | PASSIVATE |
| Thread Class | 3B |
| Material | STEEL |
| Thread Size and Series/type Designator | 0.4375-20 UNIFIED NATIONAL JOINT FINE (UNJF) |
| Round Cap Outside Surface Condition | SMOOTH |
| 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 |
| Part Number | Manufacturer |
|---|---|
| 2042AS550-02 PRIMARY | Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier (USA) |
| AA1895-4 PRIMARY | Allan Aircraft Supply Co., Llc Dba Allan Aircraft Supply (USA) |
NSN 5340-01-439-6837 is a Cap,protective,dust and Moisture, manufactured by Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier, classified under FSC 5340, Hardware, Commercial. Status: active.
NSN 5340-01-439-6837 has 2 manufacturer part numbers on file: 2042AS550-02 (Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier), AA1895-4 (Allan Aircraft Supply Co., Llc Dba Allan Aircraft Supply).
Key specifications for 2042AS550-02: Width Across Flats: 0.5790 INCHES MINIMUM AND 0.5870 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE; Design Type: THREADED; Connector Nominal Thread Size for Which Designed: 0.4375 INCHES IN. 9 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.