HTSR Gearing for gearboxes or gear sets using
Spiroid®, Helicon®, Endicon®, or Concurve® gear designs, patented and trademarked by ITW Spiroid
 
 
ITW Spiroid is the only design engineering resource you'll need.  For over 40 years, we've provided unique gearing solutions.  Our specialty is "HTSR" gearing - High Torque to Space Ratio gearing, using our proprietary gearing designs called Spiroid®, Helicon®, Endicon®, and Concurve®.
Smaller and fewer parts with high torque capacity.
Choose from a large selection of skewed axis,
right angle & in-line gear products.
Design, prototyping, and production
Products
In-Line Planetary Gearboxes
Right Angle Planetary Gearboxes
Custom Right Angle Gearboxes
Spiroid & Helicon Gearing
Gear Burnishing Tools
Endicon Index and Coupling Rings