The Theta-4 is a new addition to NUTEC rotary stage series. With its water-resistant design, it is also suitable for harsh work environments. The THETA-4 can be equipped with an optional collet or 3-jaw chuck pneumatic system for various work holding applications. This brushless direct drive servo motor offers high continuous torque and extremely high acceleration capabilities. Minimizing moving parts allows THETA-4 to operate continuously, without any maintenance.

  • High Precision Performance
  • Direct-drive, brushless servomotor
  • Expectional Concentricity and Coaxially
  • Minimal cogging for outstanding velocity stability
  • Low Profile, small envelope
  • Optional Ultra-precision Clamping Collets
Other Rotary Stages

Theta-4 Features & Benefits


The THETA-4 is offered in customizable options, including standard or high precision models. The standard model’s max speed of 1000 RPMs can be achieved with a 1.095 arc second encoder. This stage has a hub diameter of 110 mm and an aperture diameter of 39 mm. Two preloaded hub bearings suspend the monolithic core, allowing high load capacities with excellent running conditions. The THETA 4 is designed having a minimal sized envelope to achieve maximum torque values.  An optional air purge system may be integrated to protect the system from micro particles by elevating internal pressure over ambient pressure.


THETA-4 provides a closed loop position and velocity feedback, enabling outstanding motion control. With a high torque to inertia ratio, this stage is ideal for high acceleration applications with rapid starts and stops. Its extreme stiffness offers outstanding dynamic characteristics with low axial and radial run out, even at maximum loads. Its monolithic rotating hub provides stability and increased precision under loads.


THETA-4 rotary positioning stage is designed for precise motor driven rotary positioning and indexing. The THETA-4 can be used in either a horizontal or vertical orientation. It can reach a continuous stall torque of 4.98 N∙m and a peak torque of 15 N∙m. Its compact design significantly lowers wobble and total indicator reading (TIR). Horizontal and vertical mounting features allow the THETA-4 to be applicable to many locations and demands. Our labyrinth seal protects the THETA-4 from dust, contaminants, and spraying water, and is ideal for any harsh laser operations. The THETA-4 excels in applications like optical metrology, high speed assemblies, 3D-Printing, micromachining, laser processing and many others.

Discuss your needs with a Nutec Engineer

Theta-4 Specifications

Length 120 mm
Width 120 mm
Height 110 mm
Hub Diameter 107 mm
Assembly Weight 7 kg
Aperture Diameter 39 mm
Payload Axial 25 kg
Payload Radial 17 kg
Travel ± 360° Continuous
Resolution 1.095 arc sec
HP 0.5 arc sec
Accuracy ≤ 20 arc sec
LIBEC ≤ 5 arc sec
Repeatability ≤ ± 3 arc sec
Maximum Speed 300 RPM
Maximum Acceleration ≥ 6000 rad/sec2
Peak Torque 15 Nm
Continuous Torque 4.96 Nm
Torque sensitivity 0.95 Nm/A
Back EMF 57 V/krpm
Rotational Inertia 0.001 kg-m2
Collet Option THETA-4
Pin / Collet Runout ≤ 10 µm
Concentricity ≤ 2 μm
Spindle Nose TIR
Minimum Stock Size 0.2 mm
Maximum Stock Size 32 mm
Collet Selection 3C/5C/D/W/F/ER

About Us

NUTEC Mechatronic Systems' positioning is based on perfection. Engineering and design are focused on details and balanced design, flawless fabrication and precision machining to exacting standards and consistent quality.

Nutec Components
81 Jefryn Boulevard East
Deer Park, NY 11729

Working Hours

Call us or email us for formal quotations. We can be reached during the week at these times.

  1. Monday-Friday: 7:30am to 4:00pm
  2. Weekends: Closed

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