The Valve,check, cataloged under National Stock Number 4820-01-421-2546, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Parker-Hannifin Corporation Dba Pneutronics Div Quick Coupler Division. Government technical data includes 13 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-421-2546 |
| Primary Part Number | CPIFF-6S-05 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Parker-Hannifin Corporation Dba Pneutronics Div Quick Coupler Division |
| Status | ACTIVE |
| Flow Control Device | POPPET |
| Connection Style | PLAIN, OPTIONAL END (PIPE) ALL ENDS |
| Mounting Position | HORIZONTAL OR VERTICAL |
| Connection Type | THREADED INTERNAL PIPE ALL ENDS |
| Style Designator | STRAIGHT THRU |
| Operating Pressure | 4600.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Thread Direction | RIGHT-HAND ALL ENDS |
| Nominal Thread Size | 0.750 INCHES ALL ENDS IN |
| Maximum Operating Temp | 190.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Disk Loading Method | SPRING |
| Media for Which Designed | FUEL/OIL, HYDROCARBON SINGLE RESPONSE |
| Thread Series Designator | NPTF 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 |
|---|---|
| CPIFF-6S-05 PRIMARY | Parker-Hannifin Corporation Dba Pneutronics Div Quick Coupler Division (USA) |
| US891385 PRIMARY | Bosch Rexroth Corporation Div Industrial Hydraulics (USA) |
| 12365950 | Bae Systems Land & Armaments L.p. (USA) |
| 12365950 | Amz Alabama Inc. (USA) |
| Reference | Meaning |
|---|---|
| S15A1.0/12 | 5/9 Secondary reference Bosch Rexroth Corporation Div Industrial Hydraulics |
| 12365950 | 7/2 Vendor item drawing reference U S Army Tank Automotive Command Amsta-Im-Mm |
NSN 4820-01-421-2546 is a Valve,check, manufactured by Parker-Hannifin Corporation Dba Pneutronics Div Quick Coupler Division, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-421-2546 has 4 manufacturer part numbers on file: CPIFF-6S-05 (Parker-Hannifin Corporation Dba Pneutronics Div Quick Coupler Division), US891385 (Bosch Rexroth Corporation Div Industrial Hydraulics), 12365950 (Bae Systems Land & Armaments L.p.), 12365950 (Amz Alabama Inc.).
Key specifications for CPIFF-6S-05: Flow Control Device: POPPET; Connection Style: PLAIN, OPTIONAL END (PIPE) ALL ENDS; Mounting Position: HORIZONTAL OR VERTICAL; Connection Type: THREADED INTERNAL PIPE ALL ENDS. 13 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.