The Valve,check, cataloged under National Stock Number 4820-01-398-4392, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Swagelok Co. Government technical data includes 5 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-398-4392 |
| Primary Part Number | SS-4C-1 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Swagelok Co |
| Status | ACTIVE |
| Flow Control Device | POPPET |
| Supplementary Features | ADDITIONAL FLOW CONTROL DEVICE: DILATING O-RING |
| Face to Face Distance | 2.350 INCHES IN |
| Material | STEEL COMP 316 OVERALL |
| Opening Pressure Setting | 1.0 POUNDS PER SQUARE INCH LBS |
| 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-4C-1 PRIMARY | Swagelok Co (USA) |
| SS-4C-1 | South London Valve & Fitting Company Ltd T/a Swagelok London (GBR) |
| Reference | Meaning |
|---|---|
| 4C-1 | 5/1 Secondary reference South London Valve & Fitting Company Ltd T/a Swagelok London |
| SS-4C-1 | 5/9 Secondary reference Nupro Co |
NSN 4820-01-398-4392 is a Valve,check, manufactured by Swagelok Co, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-398-4392 has 2 manufacturer part numbers on file: SS-4C-1 (Swagelok Co), SS-4C-1 (South London Valve & Fitting Company Ltd T/a Swagelok London).
Key specifications for SS-4C-1: Flow Control Device: POPPET; Supplementary Features: ADDITIONAL FLOW CONTROL DEVICE: DILATING O-RING; Face to Face Distance: 2.350 INCHES IN; Material: STEEL COMP 316 OVERALL. 5 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.