The Plug,vent, cataloged under National Stock Number 5340-01-139-3478, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. The manufacturer of record is Arrow Pneumatics Inc. Government technical data includes 10 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active. Unit of issue: EA.
| Parameter | Value |
|---|---|
| NSN | 5340-01-139-3478 |
| Primary Part Number | ASP-3BV |
| Item Name | Plug,vent |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Manufacturer | Arrow Pneumatics Inc |
| Status | ACTIVE |
| Length | 0.750 INCHES NOMINAL IN |
| Vent Hole Shape | ROUND |
| Thread Length | 0.500 INCHES NOMINAL IN |
| End Connection Type | THREADED |
| Outside Diameter | 0.688 INCHES NOMINAL IN |
| Thread Class | 2A A |
| Material | COPPER ALLOY |
| Thread Size and Series/type Designator | 0.375 NPT |
| Vent Hole Quantity | 1 |
| Refinement Device Type | FILTER DISK |
| 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 |
|---|---|
| 955AS343-1 | Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier (USA) |
| ASP-3BV PRIMARY | Arrow Pneumatics Inc (USA) |
| Reference | Meaning |
|---|---|
| 955AS343 | 7/2 Vendor item drawing reference Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier |
| ASP3BV3/8 | 5/9 Secondary reference Arrow Pneumatics Inc |
NSN 5340-01-139-3478 is a Plug,vent, manufactured by Arrow Pneumatics Inc, classified under FSC 5340, Hardware, Commercial. Status: active.
NSN 5340-01-139-3478 has 2 manufacturer part numbers on file: 955AS343-1 (Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier), ASP-3BV (Arrow Pneumatics Inc).
1 possible match (shared part number, not a government interchangeability claim): 2520-01-483-5574. Verify interchangeability with system specifications before substitution.
Key specifications for ASP-3BV: Length: 0.750 INCHES NOMINAL IN; Vent Hole Shape: ROUND; Thread Length: 0.500 INCHES NOMINAL IN; End Connection Type: THREADED. 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.