The Cap,protective,dust and Moisture, cataloged under National Stock Number 5340-01-131-0725, 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 4 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active. Unit of issue: EA.
| Parameter | Value |
|---|---|
| NSN | 5340-01-131-0725 |
| Primary Part Number | 639AS1021 |
| 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 |
| Design Type | FRICTION |
| Overall Diameter | 2.180 INCHES NOMINAL IN |
| Opening Inside Diameter for Which Designed | 2.090 INCHES MINIMUM AND 2.110 INCHES MAXIMUM IN |
| Material | PLASTIC, POLYETHYLENE (PP) |
| 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 |
|---|---|
| 588.40-000000-001 | Diehl Defence Gmbh & Co. Kg (DEU) |
| 639AS1021 PRIMARY | Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier (USA) |
| 639AS1021 | Nestor Sales Llc Dba Aim Supply Co Div Government Sales Division (USA) |
| Reference | Meaning |
|---|---|
| 10176940 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
NSN 5340-01-131-0725 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 5340-01-131-0725 has 3 manufacturer part numbers on file: 588.40-000000-001 (Diehl Defence Gmbh & Co. Kg), 639AS1021 (Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier), 639AS1021 (Nestor Sales Llc Dba Aim Supply Co Div Government Sales Division).
Key specifications for 639AS1021: Design Type: FRICTION; Overall Diameter: 2.180 INCHES NOMINAL IN; Opening Inside Diameter for Which Designed: 2.090 INCHES MINIMUM AND 2.110 INCHES MAXIMUM IN; Material: PLASTIC, POLYETHYLENE (PP). 4 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.