The Hydraulic Oil Filter Element 3840-03-121 is a high-performance filtration component engineered as a direct interchange for original equipment filters. This filter element is designed for hydraulic and lubrication systems requiring reliable particulate removal to protect pumps, valves, cylinders, and other sensitive components from contamination-induced damage.
Manufactured with premium glass fiber filtration media, the 3840-03-121 delivers high filtration efficiency with low pressure drop and excellent dirt-holding capacity. The 3840-03-121 filter element is a versatile replacement compatible with multiple hydraulic systems across industrial and mobile applications.
| Type | Hydraulic Oil Filter Element |
| Part number | 3840-03-121 |
| Dimension | Customized |
| Filter material | Fiberglass |
| Flow direction | Outside – inside |
| Working temperature | -20~+110℃ |
| Compatible fluids | Mineral hydraulic oil, phosphate ester hydraulic oil, emulsion, water-glycol |
| Custom made | Available |
This is the specification of the customized hydraulic oil filter element. If you are in need of custom oil filter, please contact us for a quote.
Xinxiang City Huahang Filter Co., Ltd. is an ISO 9001 certified professional manufacturer specializing in the design, production, and sale of hydraulic filter elements, replacement filters, and industrial filtration solutions. Established in 2003, the company operates from a modern manufacturing facility in Xinxiang City, Henan Province – one of China’s most established filtration industry clusters.
Our workshop is equipped with automated paper folding machines, end cap assembly lines, and testing equipment to ensure consistent quality across every batch. Most of our workers have many years of experience here, familiar with every stage of production. We believe that good products stem from a dedicated attitude and solid craftsmanship.
The 3840-03-121 hydraulic oil filter element serves a wide range of industrial hydraulic and lubrication applications:
At Huahang Filter, we offer robust customization services to tailor the TR-20230 filter element to your specific needs.
Custom Filtration Ratings: Available from 1μm to 100μm to match your exact particle removal requirements
Custom Seal Materials: NBR, Viton, EPDM, or PTFE-encapsulated options
Custom End Caps: Carbon steel, stainless steel, aluminum, or reinforced nylon configurations
Custom Dimensions: Alternative lengths and diameters to fit unique housings
Special Media Options: Glass fiber blends for higher efficiency or wire mesh for cleanable applications
Custom Packaging: Bulk packaging or individual boxes with branding and instructions
Q1: What Micron Rating Should I Choose for a Replacement Oil Filter?
A: The micron rating should be selected according to the required oil cleanliness level, system pressure, oil type, flow rate, and the sensitivity of components such as hydraulic valves or servo systems. A finer filter is not automatically better if it creates excessive pressure drop.
Q2: Can I Use a Different Filter Material Than the Original Element?
A: Yes, in some applications. However, the alternative media should provide equivalent or better filtration efficiency, flow performance, pressure resistance, and fluid compatibility.
Q3: Can I Use a Replacement Element With the Same Size but a Different Micron Rating?
A: It is generally not recommended without checking the system requirements. Changing the micron rating can affect contamination control, pressure drop, filter life, and component protection.
