The Cartridge,check Valve, cataloged under National Stock Number 4820-01-137-8177, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Hydrasearch Company, Llc. Government technical data includes 6 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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.
| Parameter | Value |
|---|---|
| NSN | 4820-01-137-8177 |
| Primary Part Number | 6KC66-3 |
| Item Name | Cartridge,check Valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Hydrasearch Company, Llc |
| Status | ACTIVE |
| Port Diameter | 0.500 INCHES NOMINAL IN |
| Operating Pressure | 6000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM LBS |
| Valve Size | 0.500 INCHES IN |
| Maximum Operating Temp | 230.0 FAHRENHEIT DEGF |
| Material | COPPER ALLOY |
| Thread Size and Series/type Designator | 1/2-14 NPT |
| 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 |
|---|---|
| 6KC66-3 PRIMARY | Hydrasearch Company, Llc (USA) |
| Reference | Meaning |
|---|---|
| C-4706 | D/9 Drawing number reference only Hydrasearch Co., Inc. Dba Use CAGE Code 32142 for Cataloging |
NSN 4820-01-137-8177 is a Cartridge,check Valve, manufactured by Hydrasearch Company, Llc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-137-8177 has 1 manufacturer part number on file: 6KC66-3 (Hydrasearch Company, Llc).
Key specifications for 6KC66-3: Port Diameter: 0.500 INCHES NOMINAL IN; Operating Pressure: 6000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM LBS; Valve Size: 0.500 INCHES IN; Maximum Operating Temp: 230.0 FAHRENHEIT DEGF. 6 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.