The Valve,check, cataloged under National Stock Number 4820-01-140-0004, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Swagelok Co. Government technical data includes 19 specifications, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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.
| Parameter | Value |
|---|---|
| NSN | 4820-01-140-0004 |
| Primary Part Number | SS-6C-1 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Swagelok Co |
| Status | ACTIVE |
| Flow Control Device | POPPET |
| Furnished Items and Quantity | 2 NUT |
| Connection Style | PLAIN (TUBE) ALL ENDS |
| Mounting Position | HORIZONTAL OR VERTICAL |
| Connection Type | THREADED EXTERNAL TUBE ALL ENDS |
| Style Designator | STRAIGHT THRU |
| Material Document and Classification | ED-STD-66, AISI 303/SAE 30303 FED STD 5TH MATERIAL RESPONSE FLOW CONTROL DEVICE |
| Material Document and Classification | FED-STD-66, AISI 303/SAE 30303 FED STD SINGLE MATERIAL RESPONSE BODY |
| Operating Pressure | 3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Thread Direction | RIGHT-HAND ALL ENDS |
| Nominal Thread Size | 0.438 INCHES ALL ENDS IN |
| Maximum Operating Temp | 71.0 CELSIUS SINGLE RESPONSE DEGC |
| Media for Which Designed | WATER, FRESH SECOND RESPONSE |
| Media for Which Designed | ETHYLENE GLYCOL FIRST RESPONSE |
| Thread Class | 2A ALL ENDS A |
| Material | STEEL COMP 303 FLOW CONTROL DEVICE |
| Material | STEEL COMP 303 BODY |
| Thread Series Designator | UNF ALL ENDS |
| Valve Operation Method | AUTOMATIC |
| 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 |
|---|---|
| SS-6C-1WITH NEOPRENE O RING | Swagelok Co (USA) |
| 6Z-C6L-1-SS | Parker-Hannifin Corp Div Instrumentation Products Division (USA) |
| SS-6C-1 PRIMARY | Swagelok Co (USA) |
| 03-NRV-SS-00375-0001 | Salt Separation Services Ltd (GBR) |
| Reference | Meaning |
|---|---|
| 4820PL2072679 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| 11462358 | 7/2 Vendor item drawing reference Us Army Aviation and Missile Command |
| SS-6C-1WITH NEOPRENE O RING | 5/9 Secondary reference Nupro Co |
| SS-6C-1 | 5/9 Secondary reference Nupro Co |
NSN 4820-01-140-0004 is a Valve,check, manufactured by Swagelok Co, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-140-0004 has 4 manufacturer part numbers on file: SS-6C-1WITH NEOPRENE O RING (Swagelok Co), 6Z-C6L-1-SS (Parker-Hannifin Corp Div Instrumentation Products Division), SS-6C-1 (Swagelok Co), 03-NRV-SS-00375-0001 (Salt Separation Services Ltd).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-528-4481. Verify interchangeability with system specifications before substitution.
Key specifications for SS-6C-1: Flow Control Device: POPPET; Furnished Items and Quantity: 2 NUT; Connection Style: PLAIN (TUBE) ALL ENDS; Mounting Position: HORIZONTAL OR VERTICAL. 19 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.