THK KR4620A-0590 LM Guide Ball Screw Actuator

Description:

The THK KR4620A-0590 LM Guide Ball Screw Actuator is a heavy-duty linear positioner featuring an integrated LM Guide and precision ball screw with a 20 mm lead and 590 mm stroke for high-speed, high-rigidity linear motion. Commonly installed in CNC machinery, industrial automation systems, semiconductor equipment, packaging machines, robotics, material handling equipment, and precision manufacturing applications requiring accurate linear positioning. Machine builders, maintenance technicians, and automation integrators use this actuator for new machine construction, production line upgrades, retrofits, and replacement of worn linear motion assemblies.

Applications:

The THK KR4620A-0590 belongs to THK's KR46 Series LM Guide Actuator family, integrating a U-shaped high-rigidity outer rail, LM Guide bearings, and a precision ball screw into a compact, enclosed actuator. Its 20 mm ball screw lead enables high-speed travel while maintaining excellent rigidity and positioning accuracy. Designed for direct coupling to a NEMA 23 stepper or servo motor, the actuator provides smooth, low-friction operation and four-way equal load capability, making it ideal for automated assembly systems, pick-and-place equipment, inspection stations, machine tools, and industrial production equipment operating under demanding conditions.

Technical Specifications:

• Brand: THK
• Part Number: KR4620A-0590
• Product Type: LM Guide Ball Screw Actuator / Linear Positioner
• Series: KR46 LM Guide Actuator
• Drive Method: Precision Ball Screw
• Ball Screw Lead: 20 mm
• Stroke (Travel): 590 mm
• Overall Length: Approximately 840 mm
• Guide Type: Integrated LM Guide Actuator
• Motor Compatibility: NEMA 23 Stepper or Servo Motor
• Coupling Bore: 9.5 mm Diameter
• Carriage Dimensions: 105 × 53 mm
• Carriage Mounting Pattern: 46 × 46 mm
• Rated Maximum Speed: Up to 1,000 mm/s (KR46 Series, 20 mm lead)
• Rated Thrust: 359 N
• Estimated Motor Capacity: 400 W
• Load Direction: Four-Way Equal Load Capability
• Construction: High-rigidity U-shaped outer rail with integrated LM Guide and ball screw
• Features: Compact design, enclosed ball screw, high-speed operation, low friction, high rigidity, excellent positioning accuracy, direct motor coupling, maintenance-friendly construction, supplied with 3 photo gate sensors on this configuration.

Common Replacements:

• THK KR4620A-0490
• THK KR4620A-0690
• THK KR4610A-0590