The Stem,fluid Valve, cataloged under National Stock Number 4820-01-273-4340, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Evergreen Midwest Co. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-273-4340 |
| Primary Part Number | 9-3506-12 |
| Item Name | Stem,fluid Valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Evergreen Midwest Co |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 9-3506-12 PRIMARY | Evergreen Midwest Co (USA) |
| Reference | Meaning |
|---|---|
| 2999 | 5/9 Secondary reference Racal Panorama Inc |
| 9-3506-12 | C/1 Advisory reference — outside the item-of-supply concept Mar-Vel International, Inc. Dba Mar-Vel Underwater Equip |
| 9-3506-12 | 3/9 Design control — primary reference Harsco Corp Sherwood Div |
NSN 4820-01-273-4340 is a Stem,fluid Valve, manufactured by Evergreen Midwest Co, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-273-4340 has 1 manufacturer part number on file: 9-3506-12 (Evergreen Midwest Co).
4 possible matches (shared part number, not a government interchangeability claim): 5365-01-366-6405, 6145-01-412-9349, 2540-01-608-6645. Verify interchangeability with system specifications before substitution.
Key specifications for 9-3506-12: Overall Length: 1.328 INCHES NOMINAL IN; Special Features: ADD'L DATA,MATL: CDA 642 DURONZE III; FINISH: BRIGHT NICKEL PLATE; THREAD DATA: 10-24UNC-2A; OTHER END 0.4375 IN. DIA; USED ON P/N YV2301,VALVE ASSELMBLY,CYLINDER CAGEC 70292,NSN 4240-01-218-9090 A; End Item Identification: SELF CONTAINED BREATHING APPARATUS. 0 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). 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.