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Product profile

HEJ 90

HEJ 90 is maxon's integrated high-efficiency robotic joint for locomotion, mobile manipulation and industrial robot axes. The official product material com...

Facts

Company
maxon
Product type
component
Status
commercial
Primary capability
robot_joint_actuation
Website
https://global.maxongroup.com/high-efficiency-joints

About HEJ 90

HEJ 90 is maxon's integrated high-efficiency robotic joint for locomotion, mobile manipulation and industrial robot axes. The official product material combines a motor, gears, electronics, sensing, output bearing and IP67 housing, with 140 Nm peak torque, 75 Nm continuous torque and EtherCAT control.

Market context

https://zlsbkmaixmmnjrgpkcyp.supabase.co/storage/v1/object/public/robotics_assets/products/korthos-product-candidates-2026-08-22-batch-30/maxon-hej-90-16x9.jpg, integrated_actuator_module, integrated_robotic_actuator, 1600, 900, 501fb68bba32199ab80e54fab0087b1f456a331430583d7bd0516da8646f2514, reviewed_16x9_official_media, Integrated Robotic Joint, robotics_assets, https://global.maxongroup.com/hubfs/Team_HQ_Global/10_Robotics/HEJ%2090%20Radial%20Axial.png, https://global.maxongroup.com/high-efficiency-joints, official_product_page, https://zlsbkmaixmmnjrgpkcyp.supabase.co/storage/v1/object/public/robotics_assets/products/korthos-product-candidates-2026-08-22-batch-30/maxon-hej-90-16x9.jpg, Approved by user after strict contact-sheet review; rendered at exact 1600x900 with no letterbox, added border or transparent background., component, products/korthos-product-candidates-2026-08-22-batch-30/maxon-hej-90-16x9.jpg, 2026-08-22, joint_module, false, source_photo_16x9_contain, components, source_photo_16x9_contain, Integrated Robotic Joint, components, joint_module, components

Summary

Type: Integrated robotic joint

Core: 140 Nm peak torque in a 2 kg joint module

Function: Provides dense, backdrivable and EtherCAT-controlled actuation for quadrupeds, humanoids, mobile manipulators and industrial robot axes

Audience: Robot OEMs, robot integrators, robotics researchers and automation engineers

Specifications

axial_length_mm
90 mm
backdriving_torque_nm
<1.5 Nm
communication
EtherCAT, 1 kHz maximum communication rate
continuous_torque_nm
75 Nm
control_modes
Joint position, velocity, torque, motor current (FOC) and joint impedance
diameter_mm
110 mm
integrated_elements
Motor, planetary gears, electronics, encoders/sensing, output bearing and housing
mass_kg
2 kg
mechanical_backlash_deg
Average 0.48°; 0.35–0.61° range
operating_voltage_v
20–60 V
peak_joint_velocity_rad_s
Official product-page table value rad/s
peak_torque_nm
140 Nm
protection
IP67

Operations

Environment
robotics_laboratories, industrial_automation, mobile_robot_operations, outdoor_operations
Primary user
robot_oems, robot_integrators, robotics_researchers, automation_engineers
Role
robot_joint_actuation, robotic_manipulation, mobile_robot_actuation, industrial_automation
Interaction model
embedded_robot_integration, joint_position_control, joint_torque_control, ethercat_communication
Mobility class
fixed_component, embedded_robot_component, rotary_actuator_module
Product detail
https://zlsbkmaixmmnjrgpkcyp.supabase.co/storage/v1/object/public/robotics_assets/products/korthos-product-candidates-2026-08-22-batch-30/maxon-hej-90-16x9.jpg, integrated_actuator_module, integrated_robotic_actuator, 1600, 900, 501fb68bba32199ab80e54fab0087b1f456a331430583d7bd0516da8646f2514, reviewed_16x9_official_media, Integrated Robotic Joint, robotics_assets, https://global.maxongroup.com/hubfs/Team_HQ_Global/10_Robotics/HEJ%2090%20Radial%20Axial.png, https://global.maxongroup.com/high-...

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