ZK Precision Hollow Rotary Actuator

Product Overview

The ZK precision hollow rotary actuator (also known as hollow rotary indexing platform) is engineered for high-precision positioning, stable rotational motion, and flexible equipment integration. Designed with a center hollow structure, the ZK series allows cables, pipes, air lines, or drive components to pass directly through the core. This dramatically simplifies machine design and enables direct mounting of fixtures, tooling plates, robotic arms, and worktables.

In modern industrial automation, the need for precise, repeatable, smooth rotary positioning is critical. Traditional cam indexers offer fixed indexing options, while DD motors provide exceptional accuracy but come with a significantly higher investment cost. The ZK hollow rotary platform bridges this gap by delivering DD motor-level precision with lower cost, high reliability, and ease of installation. For additional technical reference on precision rotary actuators and motion control, the National Institute of Standards and Technology (NIST) offers valuable resources.

Built with high-precision ground gears, tapered roller bearings, and a rigid body structure, the ZK series is ideal for equipment manufacturers seeking repeatability, stability, and simplified machine architecture. Each model—ZK60-5, ZK100-8, ZK130-10, ZK200-10, and ZK275-10—supports different torque ranges and application scenarios.

These units are widely used in robotics, semiconductor automation, optical inspection systems, assembly equipment, pick-and-place machinery, packaging automation, and precision measuring instruments.

Key Features

  • Direct Workpiece Locking — Fast & Flexible Installation
    The ZK precision hollow rotary actuator allows the workpiece or tooling plate to be mounted directly on the rotating surface.
    This provides these major benefits:
    Eliminates extra fixtures or couplings
    Enhances stability during high-precision transferring
    Reduces overall assembly time and structural complexity
    Ensures greater rigidity and higher payload performance
    This makes the ZK series especially suitable for equipment requiring high repeatability and minimal structural vibration.
  • Convenient Cable and Piping Integration
    Because the ZK precision hollow rotary actuator is hollow at the center, you can freely route:
    Motor or encoder cables
    Pneumatic tubes
    Hydraulic lines
    Sensor wiring
    Fiber optics or vacuum lines
    This simplifies electrical and pneumatic layout design, prevents cable bending fatigue, and improves long-term reliability. For multi-axis robotic systems or rotating stations, this reduces wiring failures and mechanical interference.
  • A Cost-Effective Alternative to DD Motors and Cam Indexers
    The ZK precision hollow rotary actuator overcomes the limitations of both traditional systems:
    Cam indexers offer strong mechanical reliability but cannot provide arbitrary rotational angles or digital control.
    DD motors allow full-range motion and high accuracy but are significantly more expensive and often require complex tuning.
    The ZK series uses ultra-precision processed gears and an internal backlash-elimination mechanism. This delivers high accuracy and digital positioning capability while significantly reducing installation and maintenance costs. For many automation systems, the ZK platform is the ideal middle-ground solution.
  • High Positioning Accuracy — Repeatability ±15 sec, Lost Motion 2 min
    Thanks to a preloaded precision gear mechanism, the ZK rotary actuator achieves:
    Repeatability: ≤±15 arc-seconds
    Lost motion (bi-directional): ≤2 arc-minutes
    Since there is no gear backlash, the unit maintains exceptional precision even after long-term use. This is essential for semiconductor inspection, optical measurement, or positioning tasks requiring consistent micro-level accuracy.
  • Direct Mechanical Connection — Increased Reliability & Reduced Maintenance
    The hollow output platform allows direct mounting of:
    Robotic arms
    Turntables
    Vision inspection modules
    Assembly tooling
    Automation platforms
    Because no belts, pulleys, or intermediate transmission components are required, the system benefits from:
    Higher accuracy retention
    Improved transmission efficiency
    Minimal mechanical wear
    Lower maintenance cost
    This also eliminates belt-tensioning issues and alignment errors found in traditional drive systems.

Technical Information

SpecsUnitZK60-5ZK100-8ZK130-10ZK200-10ZK275-10
Bearing of Rotate Table–Deep groove ball bearingTapered roller bearingTapered roller bearingTapered roller bearingTapered roller bearing
Adaptive TorqueN·m545458080
Precision LifeHrs15000Hrs20000Hrs20000Hrs20000Hrs20000Hrs
Allowable Speedrpm200 (Plate)200 (Plate)200 (Plate)200 (Plate)200 (Plate)
Reduction Ratioi58101010
Repeat Accuracyarc-sec≤15≤10≤10≤10≤10
Positioning Accuracyarc-min≤1≤1≤1≤1≤1
Parallelism of Rotate Platemm≤0.02≤0.02≤0.02≤0.02≤0.02
Concentricity of Rotate Platemm≤0.02≤0.02≤0.02≤0.02≤0.015
Protection ClassIPIP40IP40IP40IP40IP40
ZK Precision Hollow Rotary Actuator Dimensions-ZK 60
ZK Precision Hollow Rotary Actuator Dimensions-ZK 100
ZK Precision Hollow Rotary Actuator Dimensions-ZK 130
ZK Precision Hollow Rotary Actuator Dimensions-ZK 200
ZK Precision Hollow Rotary Actuator Dimensions-ZK 275

ZK Series Brochure (PDF)

3D CAD Models (STEP/IGES)

User Manual & Installation Guide

Torque & Load Calculation Sheets

Applications

  • Robotics & Automation: Multi-axis robotic arms; End-of-arm tooling rotation; Pick-and-place indexing systems
  • Semiconductor & Electronics Manufacturing: Wafer loading/unloading; Inspection turntables; PCB alignment systems
  • Optical Inspection & Precision Measurement: Camera rotation platforms; Optical testing alignment fixtures; Precision scanning mechanisms
  • Medical & Laboratory Automation: Sample handling rotary stations; Micro-positioning analysis equipment
  • Packaging & Assembly Systems: Rotational filling machines; Multi-station assembly indexing tables
  • General Industrial Machinery: Automated welding stations; CNC auxiliary rotation platforms; Automated fastening systems

Contact Us

Request a Quote or Technical Consultation for the ZK precision hollow rotary actuator. Contact our engineers for more details.

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