The Valve,check, cataloged under National Stock Number 4820-01-355-8975, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Sterling Hydraulics Inc. Government technical data includes 9 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-355-8975 |
| Primary Part Number | E2A050Y4350NMK2 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Sterling Hydraulics Inc |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Criticality Code Justification | FEAT |
| Connection Type | THREADED CARTRIDGE ALL ENDS |
| Style Designator | SCREW-IN CARTRIDGE |
| Maximum Operating Temp | 194.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Media for Which Designed | FUEL/OIL, HYDROCARBON SINGLE RESPONSE |
| Material | ALUMINUM ALLOY BODY |
| Opening Pressure Setting | 4350.0 POUNDS PER SQUARE INCH LBS |
| 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 | Y |
| Part Number | Manufacturer |
|---|---|
| 2HK174 | Oshkosh Defense Llc (USA) |
| E2A50Y4350NMK2 | Sterling Hydraulics Inc (USA) |
| BSK11307 ITEM NO. 1 | Sterling Hydraulics Inc (USA) |
| E2A050Y4350NMK2 PRIMARY | Sterling Hydraulics Inc (USA) |
| Reference | Meaning |
|---|---|
| BSK11307 | D/9 Drawing number reference only Sterling Hydraulics Inc |
| E2A50YAABN | 5/9 Secondary reference Sterling Hydraulics Inc |
NSN 4820-01-355-8975 is a Valve,check, manufactured by Sterling Hydraulics Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-355-8975 has 4 manufacturer part numbers on file: 2HK174 (Oshkosh Defense Llc), E2A50Y4350NMK2 (Sterling Hydraulics Inc), BSK11307 ITEM NO. 1 (Sterling Hydraulics Inc), E2A050Y4350NMK2 (Sterling Hydraulics Inc).
2 possible matches (shared part number, not a government interchangeability claim): 4810-01-355-8979, 5305-01-355-8980. Verify interchangeability with system specifications before substitution.
Key specifications for E2A050Y4350NMK2: Flow Control Device: DISK; Criticality Code Justification: FEAT; Connection Type: THREADED CARTRIDGE ALL ENDS; Style Designator: SCREW-IN CARTRIDGE. 9 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.