Helical Shaft Mount Product Render
Helical Shaft Mount Product Render

Helical Shaft Mount (HSM)

Helical Shaft-Mounted Speed Reducer (HSM) is one of the most popular products in our portfolio.

Helical Shaft Mount (HSM)

  • Keyless Taper-Grip® Bushing
  • 25-Degrees Pressure-Angled Gears
  • Integrated Backstop Option
  • Heavy Duty Roller Bearings for Maximum Strength and Extended Life
  • Available with CEMA Screw-Conveyor Drive Option


Output Taper-Grip® Bushing and Parallel Bore
Mounting Hollow Shaft
Sizes 13 frame sizes 
Ratio 5:1 to 25:1 
Power Range 1/4 to 300HP (0.20kW to 220kW )
Torque Capacity Up to 389,432 lb-in (44,051 N.m)
Motor Standard CE, JIS, NEMA, IEC, UL, CSA





Helical Shaft-Mounted Speed Reducer (HSM)

Helical Shaft-Mounted Speed Reducer (HSM) features patented keyless, steel Taper-Grip® bushing for easy mounting. 

HSM Photos


Warranty Claims
1 Million +
Units Sold
of Experience


Intergral Pinion

Robust, integrated input shafts and pinions providing reliability and durability

Taper Grip Bush

Simple keyless mounting and easy removal

Case Design

Gear case is manufactured from grey cast iron, and is precision bored and doweled to ensure accurate assembly.


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Document Type


Do you have questions about the Helical Shaft Mount (HSM)? Below are some of our most commonly asked questions or you can view our Support area under Knowledge for more frequently asked questions and answers. 

There are many accessories for use with the Helical Shaft Mount (HSM). Our patented Taper Grip Bushing is well suited for any application. A motor mount, backstop, torque arm, ABS belt guard, belts, breathers, sheaves and harsh duty seals are all accessories that work well with the HSM for any application. Also available are screw conveyor shafts, screw conveyor adaptor kits and screw conveyor seal kits. 

Yes. Provide as much information as possible to your Sumitomo representative when discussing outdoor HSM applications. Corrosive, abrasive, hot, and cold environments each require a different type of optional seal.

Yes, only if the mixer’s impeller is not attached to a long shaft. The impeller is subjected to radial loads, and the HSM bearings provide the shaft support. The HSM’s compact bearing span makes it unsuitable for supporting radial loads applied at long distances from the reducer.

Emergency After-Hours Support


Sumitomo’s Product Support offers scheduled repair services as a one-stop-shop for all your related gearbox needs. For emergency repairs, we offer repair services 24 hours a day, 7 days a week.

Cyclo and Spur Gear

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