The Valve,safety Relief, cataloged under National Stock Number 4820-00-450-6539, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Parker-Hannifin Corporation Dba Pneutronics Div Quick Coupler Division. Government technical data includes 18 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 2 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-450-6539 |
| Primary Part Number | 4644-1 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — No Item Name Available |
| Manufacturer | Parker-Hannifin Corporation Dba Pneutronics Div Quick Coupler Division |
| Status | ACTIVE |
| Connection Style | FLARED (TUBE) FIRST END |
| Thread Class | 3A FIRST END A |
| Disk Loading Method | SPRING |
| Opening Pressure Setting | 1425.0 POUNDS PER SQUARE INCH LBS |
| Nominal Thread Size | 0.437 INCHES FIRST END IN |
| Flow Control Device | POPPET |
| Nominal Outside Diameter Tube Accommodated | 0.250 INCHES FIRST END IN |
| Seat Angle | 37.0 DEGREES FIRST END |
| Material | ALUMINUM ALLOY SEAT |
| Style Designator | ANGLE |
| Connection Type | THREADED EXTERNAL TUBE FIRST END |
| Thread Series Designator | UNF FIRST END |
| Surface Treatment Document and Classification | MIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE LOCATION NOT OTHERWISE SPECIFIED |
| Thread Quantity Per Inch | 20 FIRST END |
| Surface Treatment | ANODIZE LOCATION NOT OTHERWISE SPECIFIED |
| Valve Operation Method | AUTOMATIC |
| Material | ALUMINUM ALLOY BODY |
| Thread Direction | RIGHT-HAND FIRST END |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
NSN 4820-00-450-6539 is a Valve,safety Relief, manufactured by Parker-Hannifin Corporation Dba Pneutronics Div Quick Coupler Division, classified under FSC 4820 (No Item Name Available). Status: active.
NSN 4820-00-450-6539 has 3 cross-referenced part numbers: 4644-1 (Parker-Hannifin Corporation Dba Pneutronics Div Quick Coupler Division), 166L068-3 (Northrop Grumman Systems Corporation), 166L068-3 (Northrop Grumman Systems Corporation).
There are 2 known substitutes for 4820-00-450-6539: 5950-00-648-1732, 4310-01-334-2379. Verify interchangeability with system specifications before substitution.
Key specifications for 4644-1: Connection Style: FLARED (TUBE) FIRST END; Thread Class: 3A FIRST END A; Disk Loading Method: SPRING; Opening Pressure Setting: 1425.0 POUNDS PER SQUARE INCH LBS. 18 total characteristics are documented in the Federal Logistics Information System.