The Plug,vent, cataloged under National Stock Number 5340-01-534-6590, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. The manufacturer of record is Swagelok Co. 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. Current acquisition status: Active. Unit of issue: EA.
| Parameter | Value |
|---|---|
| NSN | 5340-01-534-6590 |
| Primary Part Number | SS-MD-4 |
| Item Name | Plug,vent |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Manufacturer | Swagelok Co |
| Status | ACTIVE |
| Refinement Medium Type | FILTERING |
| End Connection Type | THREADED |
| Material | STEEL CORROSION RESISTING |
| 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 |
|---|---|
| MS-MD-4MSS | Swagelok Co (USA) |
| SS-MD-4 PRIMARY | Swagelok Co (USA) |
| 9833K22 PRIMARY | General Electric Company (USA) |
NSN 5340-01-534-6590 is a Plug,vent, manufactured by Swagelok Co, classified under FSC 5340, Hardware, Commercial. Status: active.
NSN 5340-01-534-6590 has 3 manufacturer part numbers on file: MS-MD-4MSS (Swagelok Co), SS-MD-4 (Swagelok Co), 9833K22 (General Electric Company).
Key specifications for SS-MD-4: Refinement Medium Type: FILTERING; End Connection Type: THREADED; Special Features: TECHNICAL DATA FURNISHED CALLS ITEM STAINLESS TUBE FITTING, 1/4 IN. MUD DAUBER;ITEM IS 1/4-18 NPT W/18 THDS PER IN. IN; Part Name Assigned by Controlling Agency: PROTECTOR VENT, SPECIAL. 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.