The Valve,stop-Check, cataloged under National Stock Number 4820-01-436-5845, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Appleton Marine Inc. Government technical data includes 12 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-436-5845 |
| Primary Part Number | YMD-6842 |
| Item Name | Valve,stop-Check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Appleton Marine Inc |
| Status | ACTIVE |
| Connection Style | PLAIN (SCREW-IN CARTRIDGE) ALL ENDS |
| Mounting Position | HORIZONTAL OR VERTICAL |
| Connection Type | THREADED CARTRIDGE ALL ENDS |
| Style Designator | SCREW-IN CARTRIDGE |
| Operating Pressure | 3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Bonnet Type | INSIDE SCREW |
| Thread Direction | RIGHT-HAND ALL ENDS |
| Nominal Thread Size | 1.250 INCHES ALL ENDS IN |
| Bonnet Attachment Method | THREADED |
| Material | ALUMINUM BODY |
| 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 |
|---|---|
| AMD-1137 ITEM 1 | Appleton Marine Inc (USA) |
| FDFA-LAV-LAM | Sun Hydraulics Corporation (USA) |
| YMD-6842 PRIMARY | Appleton Marine Inc (USA) |
NSN 4820-01-436-5845 is a Valve,stop-Check, manufactured by Appleton Marine Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-436-5845 has 3 manufacturer part numbers on file: AMD-1137 ITEM 1 (Appleton Marine Inc), FDFA-LAV-LAM (Sun Hydraulics Corporation), YMD-6842 (Appleton Marine Inc).
Key specifications for YMD-6842: Connection Style: PLAIN (SCREW-IN CARTRIDGE) ALL ENDS; Mounting Position: HORIZONTAL OR VERTICAL; Connection Type: THREADED CARTRIDGE ALL ENDS; Style Designator: SCREW-IN CARTRIDGE. 12 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.