The Plug,vent, cataloged under National Stock Number 5340-00-673-1789, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. The manufacturer of record is Parker-Hannifin Corporation Dba Pneutronics Div Hydraulic Valve Division. Government technical data includes 11 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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. Unit of issue: EA.
| Parameter | Value |
|---|---|
| NSN | 5340-00-673-1789 |
| Primary Part Number | 3-2957-21 |
| Item Name | Plug,vent |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Manufacturer | Parker-Hannifin Corporation Dba Pneutronics Div Hydraulic Valve Division |
| Status | ACTIVE |
| Vent Hole Diameter | 0.312 INCHES NOMINAL IN |
| Length | 0.625 INCHES NOMINAL IN |
| Vent Hole Shape | ROUND |
| Thread Length | 0.375 INCHES NOMINAL IN |
| End Connection Type | THREADED |
| Outside Diameter | 0.875 INCHES NOMINAL IN |
| Inside Diameter | 0.500 INCHES NOMINAL IN |
| Thread Class | 2A A |
| Material | ALUMINUM ALLOY |
| Thread Size and Series/type Designator | 0.875-14 UNF |
| Vent Hole Quantity | 1 |
| 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 |
|---|---|
| 3-2957-21 PRIMARY | Parker-Hannifin Corporation Dba Pneutronics Div Hydraulic Valve Division (USA) |
| Reference | Meaning |
|---|---|
| 3-2957-21 | 5/9 Secondary reference U.S. Government activity |
NSN 5340-00-673-1789 is a Plug,vent, manufactured by Parker-Hannifin Corporation Dba Pneutronics Div Hydraulic Valve Division, classified under FSC 5340, Hardware, Commercial. Status: active.
NSN 5340-00-673-1789 has 1 manufacturer part number on file: 3-2957-21 (Parker-Hannifin Corporation Dba Pneutronics Div Hydraulic Valve Division).
Key specifications for 3-2957-21: Vent Hole Diameter: 0.312 INCHES NOMINAL IN; Length: 0.625 INCHES NOMINAL IN; Vent Hole Shape: ROUND; Thread Length: 0.375 INCHES NOMINAL IN. 11 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.