The Valve,restrictor Check, cataloged under National Stock Number 4820-00-574-5643, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Pneudraulics, Inc.. Government technical data includes 21 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 4 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 5 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-574-5643 |
| Primary Part Number | 6125-4 |
| Item Name | Valve,restrictor Check |
| FSC / FSG | 4820 / 48 — No Item Name Available |
| Manufacturer | Pneudraulics, Inc. |
| Status | ACTIVE |
| Connection Style | GASKET SEAL (BOSS) FIRST END |
| Mounting Position | HORIZONTAL OR VERTICAL |
| Valve Operation Method | AUTOMATIC |
| Thread Quantity Per Inch | 18 FIRST END |
| Thread Direction | RIGHT-HAND FIRST END |
| Connection Type | THREADED EXTERNAL BOSS SECOND END |
| Thread Class | 3A SECOND END A |
| Nominal Outside Diameter Tube Accommodated | 0.375 INCHES FIRST END IN |
| Material | ALUMINUM ALLOY OVERALL |
| Operating Pressure | 3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Media for Which Designed | OIL, HYDRAULIC SINGLE RESPONSE |
| Style Designator | STRAIGHT THRU |
| Nominal Thread Size | 0.562 INCHES FIRST END IN |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) FIRST END |
| Thread Direction | RIGHT-HAND SECOND END |
| Connection Style | EXTERNAL SEAT FOR GASKET SEAL (BOSS) SECOND END |
| Test Data Document | 26512-A51DCVBH027 SPECIFICATION (INCLUDES ENGINEERING TYPE BULLETINS, BROCHURES,ETC., THAT REFLECT SPECIFICATION TYPE DATA IN SPECIFICATION FORMAT; EXCLUDES COMMERCIAL CATALOGS, INDUSTRY DIRECTORIES, AND SIMILAR TRADE PUBLICATIONS, REFLECTING GENERAL TYPE DATA ON CERTAIN ENVIRONMENTAL AND PERFORMANCE REQUIREMENTS AND TEST CONDITIONS THAT ARE SHOWN AS "TYPICAL", "AVERAGE", "NOMINAL", ETC.). |
| Disk Loading Method | SPRING |
| Connection Type | THREADED INTERNAL BOSS FIRST END |
| Thread Class | 3B FIRST END |
| Flow Control Device | POPPET |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
| Part Number | Manufacturer |
|---|---|
| A51H9221-3 | Northrop Grumman Systems Corporation (USA) |
| A51H9221-3 | Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp Div Northrop Grumman Aeronautics Systems (USA) |
| A51H9221-3 | Northrop Grumman Systems Corporation (USA) |
| 6125-4 PRIMARY | Pneudraulics, Inc. (USA) |
NSN 4820-00-574-5643 is a Valve,restrictor Check, manufactured by Pneudraulics, Inc., classified under FSC 4820 (No Item Name Available). Status: active.
NSN 4820-00-574-5643 has 4 cross-referenced part numbers: A51H9221-3 (Northrop Grumman Systems Corporation), A51H9221-3 (Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp Div Northrop Grumman Aeronautics Systems), A51H9221-3 (Northrop Grumman Systems Corporation), 6125-4 (Pneudraulics, Inc.).
There are 5 known substitutes for 4820-00-574-5643: 5330-00-154-7406, 3455-00-232-4115, 1680-00-439-3121 and 2 more. Verify interchangeability with system specifications before substitution.
Key specifications for 6125-4: Connection Style: GASKET SEAL (BOSS) FIRST END; Mounting Position: HORIZONTAL OR VERTICAL; Valve Operation Method: AUTOMATIC; Thread Quantity Per Inch: 18 FIRST END. 21 total characteristics are documented in the Federal Logistics Information System.