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HTSR™ Gearing is our branding for "High Torque to Space Ratio" Gearing and has become a prominent part of the Spiroid brand around the world. HTSR™ Gearing is synonymous with gearing and gearbox designs that deliver high torque in a smaller work envelope than traditional gearing such as spur, helical, worm, spiral bevel, or hypoid gearing. More.
Spiroid Gearing: Solving the Unsolvable
ITW Heartland delivers economy, variety, complete service, and fast turnaround. We serve a variety of markets with specialty applications for:
- Aerospace
- Military & Defense
- Power Generation
- Transportation
- Robotics
ITW Heartland is the only partner for custom gears, gearbox design, and precision
manufacturing you’ll ever need. For more than 40 years, our unique gearing solutions
have served thousands of applications in dozens of industries. Our patented Spiroid®,
Helicon®, Endicon®, and Concurve® gear designs featuring our High Torque to Space
Ratio technology (HTSR™) is the solution for any gearing need.
Tell us about your gear or gearbox application to put our Design Engineers to work for you!

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