The Valve,regulating,fluid Pressure, cataloged under National Stock Number 4820-00-146-1952, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Rtx Corporation Div Pratt & Whitney. Government technical data includes 24 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 5 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 11 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-146-1952 |
| Primary Part Number | 103903-1 |
| Item Name | Valve,regulating,fluid Pressure |
| FSC / FSG | 4820 / 48 — No Item Name Available |
| Manufacturer | Rtx Corporation Div Pratt & Whitney |
| Status | ACTIVE |
| Second End Seat Angle in Deg | 12.0 |
| First End Seat Angle in Deg | 37.0 |
| Third End Style Designator | GASKET SEAL |
| Second End Outside Diameter Tube Accommodated | 0.125 INCHES NOMINAL IN |
| Temp Rating | -65.0 FAHRENHEIT MINIMUM AND 400.0 FAHRENHEIT MAXIMUM DEGF |
| Third End Thread Direction | RIGHT-HAND |
| Thread Size and Series/type Designator | 5/16-24 UNIFIED NATIONAL JOINT FINE (UNJF) MODIFIED SECOND END |
| First End Outside Diameter Tube Accommodated | 0.250 INCHES NOMINAL IN |
| Filter | NOT INCLUDED |
| End Connection Quantity | 3 |
| Third End Relationship with Preceding Ends | NOT IDENTICAL WITH FIRST OR SECOND END |
| Third End Thread Class | 2B |
| Flow Control Device | POPPET |
| Second End Style Designator | FLARELESS |
| Thread Size and Series/type Designator | 1/4-32 UNEF THIRD END |
| Body Style | TEE |
| Regulation Type | AUTOMATIC DOUBLE STAGE |
| Thread Size and Series/type Designator | 7/16-20 UNF FIRST END |
| Valve Stem Design | DOUBLE SEAT |
| Valve Loading Method | SPRING |
| First End Thread Class | 3A A |
| Second End Relationship with First End | NOT IDENTICAL |
| Second End Thread Class | 3A A |
| First End Style Designator | FLARED |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
| Part Number | Manufacturer |
|---|---|
| 2658 | Hawker Pacific Aerospace Landing Gear and Components Mfg and Repair (USA) |
| 2658-101 | Kaiser Fluid Technologies Inc. (USA) |
| 2658-101 | Hawker Pacific Aerospace Landing Gear and Components Mfg and Repair (USA) |
| 103903-1 PRIMARY | Rtx Corporation Div Pratt & Whitney (USA) |
| 2658 | Kaiser Fluid Technologies Inc. (USA) |
NSN 4820-00-146-1952 is a Valve,regulating,fluid Pressure, manufactured by Rtx Corporation Div Pratt & Whitney, classified under FSC 4820 (No Item Name Available). Status: active.
NSN 4820-00-146-1952 has 5 cross-referenced part numbers: 2658 (Hawker Pacific Aerospace Landing Gear and Components Mfg and Repair), 2658-101 (Kaiser Fluid Technologies Inc.), 2658-101 (Hawker Pacific Aerospace Landing Gear and Components Mfg and Repair), 103903-1 (Rtx Corporation Div Pratt & Whitney), 2658 (Kaiser Fluid Technologies Inc.).
There are 11 known substitutes for 4820-00-146-1952: 5950-00-265-5618, 5310-00-268-7519, 5130-00-674-9212 and 8 more. Verify interchangeability with system specifications before substitution.
Key specifications for 103903-1: Second End Seat Angle in Deg: 12.0; First End Seat Angle in Deg: 37.0; Third End Style Designator: GASKET SEAL; Second End Outside Diameter Tube Accommodated: 0.125 INCHES NOMINAL IN. 24 total characteristics are documented in the Federal Logistics Information System.