Helical Shaft Mount Speed Reducer

The Sumitomo Helical Shaft Mounted (HSM) Speed Reducer provides a convenient installation and removal method for speed reduction by mounting directly on the drive shaft. The Taper-Grip® bushing provides simple keyless mounting and easy removal.

SMSR gearbox

The HSM can be quickly and simply mounted on to the machine shaft.  A user-friendly fitting and removing system has been developed with the Sumitomo Taper-Grip® bushing, which does not require a key The particular advantages of the HSM are case hardened gears with optimized geometry for maximum load and high efficiency.  This ensures optimum power drive in a compact design.


  • Higher ratings with a 25° pressure angle and wider gear tooth face for maximum torque
  • Keyless shaft connection with Taper-Grip® bushing for easy installation and removal, simple replacement
  • Heavy duty roller bearings for maximum strength and extended life
  • Metric and AGMA standard bore sizes in both bushed and through-bore simplify specification and retrofit
  • CEMA standard screw conveyor options
  • Optional Taconite sealing systems for effective protection in specialized applications and extended operation
  • Drop in replacement
  • Flexible motor mounting capabilities
  • Backstops with centrifugal lift-off sprags to maximize reliability.


  • Power: 0.18 kW to 220 kW
  • Ratio: 5:1, 13:1, 20:1 & 25:1
  • Sizes: 015 to 608
  • Bore Sizes: Metric: 30mm to 190mm / Inch:  15/16″ to 6 1/2″


Contact us about Helical Shaft Mount Speed Reducer

Please contact us using the form below or send us an email.