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Cast iron speed reducer with 56C C-face input and round output shaft

Boston Gear

Boston Gear F718-20-B5-G Speed Reducer 20:1 56C

SKU CH-C3W9-HBK8V

A worm-gear speed reducer with a 20:1 ratio and 56C C-face input delivers up to 88 RPM and 443 in-lb torque for 0.75 hp motors

  • Worm gear design provides smooth, quiet power transmission
  • 20:1 reduction ratio delivers high torque at 88 RPM output
  • 56C C-face mounting enables direct motor coupling
  • Cast iron housing with tapered roller bearings ensures durability
  • 443 in-lb output torque handles demanding industrial loads

Boston Gear F718 20:1 56C Speed Reducer

The Boston Gear F718-20-B5-G is a worm-gear speed reducer with a 20:1 ratio and a 56C C-face motor mounting. It delivers a maximum output speed of 88 RPM and a maximum output torque of 443 in-lb. The unit accepts a maximum input of 0.75 hp and features a cast-iron housing with tapered roller bearings.

Suits 56C-frame motors needing fixed 20:1 reduction

This reducer fits applications that require a 20:1 gear ratio, a 56C motor frame and a maximum output speed of 88 RPM. It is not for buyers who need a different gear ratio, a higher input horsepower limit above 0.75 hp, an output torque above 443 in-lb or an overhung load capacity exceeding 150 lb.

20:1 gear ratio and 56C C-face mounting decide fit

The single specification that determines whether this is the right part is the 20:1 gear ratio combined with the 56C C-face input connection. If the driven equipment requires a different ratio or the motor uses a different frame size, this reducer will not match the application.

Highlights

  • Worm gear design provides smooth, quiet power transmission
  • 20:1 reduction ratio delivers high torque at 88 RPM output
  • 56C C-face mounting enables direct motor coupling
  • Cast iron housing with tapered roller bearings ensures durability
  • 443 in-lb output torque handles demanding industrial loads

Specifications

BrandBOSTON GEAR

Questions about this item

What does the 20:1 ratio mean for output speed and torque on a real motor?

The reducer multiplies motor torque by 20 while dividing motor speed by 20, delivering up to 88 RPM output with a maximum of 443 in-lb of torque.

What does the C-Face 56C input connection cap in practice?

The C-Face 56C mounting accepts NEMA 56C frame motors and limits input power to 0.75 hp maximum.

What physical space and mounting does the 1.75 in worm center distance and 2.06 in base-to-center need?

The unit requires a 1.75 in worm center distance and 2.06 in base-to-center height, mounts at any angle, and uses cast-iron housing with tapered roller bearings.

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