1. Series Overview (Classified by Size/Torque)
Series models, shaft diameter range (mm), rated torque (Nm), typical application characteristics
E2 2-5 0.05-0.5 micro encoder, grating ruler ultra small, high-precision, low inertia
E3 3-8 0.1-2 stepper motor, small servo motor balance rigidity and flexibility, economical
E4 4-10 0.5-5 industrial robot joint, CNC feed axis high torsional rigidity, anti vibration
E5 5-15 2-15 medium-sized servo system, conveyor belt drive with high torque, aluminum alloy/steel optional
E10 10-25 10-50 Heavy Machinery and Pump Transmission Double Layer Flexible Structure, Impact Resistant
E20 20-40 50-200 wind power variable pitch system, engineering equipment with super strong load capacity, with safety overload protection
2. Core design features
Flexible component type:

E2/E3: Polyurethane spider pad (good elasticity, reduced vibration strength).

E4/E5: Spiral groove metal (zero backlash, high rigidity).

E10/E20: Multi membrane type (fatigue resistant, compensating for large deviations).

Clamping method:

Radial top wire (E2-E5): suitable for small shaft diameters, easy to install.

Double flange bolt (E10-E20): high anti loosening, heavy-duty application.

texture of material:

Main body: aluminum alloy (lightweight), stainless steel (anti-corrosion), alloy steel (high load).

Flexible components: rubber (shock absorber), metal (high-precision).

3. Key parameters for selection
Parameters E2-E5 series E10-E20 series
Backgap ≤ 0.1 ° (high precision) ≤ 0.05 ° (ultra-high precision)
Speed ≤ 10000 rpm ≤ 5000 rpm
Compensation capability ± 0.2mm axial/± 1 ° angular direction ± 0.5mm axial/± 2 ° angular direction
Environmental adaptability IP54 (dustproof and splash proof) IP65 (dustproof and waterproof)
4. Application comparison
E2/E3：

Scenario: 3D printers, medical equipment, small automation.

Advantages: Lightweight, low-cost, suitable for low torque and high response.

E4/E5：

Scenario: CNC machine tools, robotic arms, AGV drives.

Advantages: Balanced rigidity and flexibility, resistant to high-frequency motor vibration.

E10/E20：

Scenario: Injection molding machines, ship servos, heavy-duty conveyor lines.

Advantages: Long lifespan under extreme loads, with fail safe design.

5. Installation and maintenance
Central requirements:

E2-E5 allows an initial deviation of ≤ 0.1mm, while E10-E20 requires laser alignment assistance.

Lubrication:

Metal flexible parts need to be regularly lubricated with grease (such as Molykote).

life:

Rubber components take about 2-3 years (requiring regular replacement), while metal components can last up to 10 years.