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Cast iron speed reducer with 56C C-face mounting, 50:1 ratio

Boston Gear

Boston Gear F721-50-B5-G Speed Reducer 56C 50:1

SKU CH-VZ48-PFCAN

A 50:1 worm speed reducer for 56C motors delivering 630 in-lb torque at 35 RPM with cast-iron housing

  • 50:1 ratio reduces speed to 35 RPM for precise motion control
  • 5 hp input delivers up to 630 in-lb output torque
  • 06 in worm centre distance handles 150 lb overhung load
  • 56C C-face mount fits standard NEMA motor frames
  • Cast iron housing with tapered roller bearings ensures durability

Speed Reducer for 56C Motors

The Boston Gear F721-50-B5-G is a worm-gear speed reducer built for 56C frame motors with a C-face input connection. It provides a fixed 50:1 reduction ratio, delivering a maximum output speed of 35 RPM. The unit suits applications that require right-angle power transmission and a maximum input horsepower of .5 hp. Its cast-iron housing and tapered roller bearings support mounting at any angle.

Thermal and Power Characteristics

The reducer handles a maximum output torque of 630 in-lb and an overhung load capacity of 150 lb during normal operation. A hardened and ground steel worm gear meshes inside the cast-iron housing to transfer power efficiently. The design accepts bidirectional rotation, allowing clockwise or counter-clockwise input without modification. These specifications define the steady-state mechanical limits for continuous duty cycles.

Sustained Load Behaviour

Under sustained load the gearset maintains the rated 630 in-lb output torque within the .5 hp input limit. The 2.06 in worm center distance and 2.28 in base-to-center dimensions fix the gear geometry for consistent meshing. Tapered roller bearings manage radial and thrust loads generated during extended operation. The housing contains a chemical known to the State of California to cause cancer and birth defects or other reproductive harm.

Highlights

  • 50:1 ratio reduces speed to 35 RPM for precise motion control
  • 5 hp input delivers up to 630 in-lb output torque
  • 06 in worm centre distance handles 150 lb overhung load
  • 56C C-face mount fits standard NEMA motor frames
  • Cast iron housing with tapered roller bearings ensures durability

Specifications

BrandBOSTON GEAR

Questions about this item

How do I mount the F721-50-B5-G speed reducer to a 56C motor and what step is often missed?

Bolt the C-face input flange to the 56C motor, align the worm centre distance of 2.06 in, then fill with the recommended gear oil before the first run.

What lubrication schedule does this worm gear unit need after installation?

Check the oil level regularly and change the gear oil at the intervals specified in the Boston Gear manual for cast-iron housed, tapered-roller bearing units.

What is the first limit reached when the reducer runs continuously at full load?

The 0.5 hp maximum input horsepower rating will be reached before the 630 in-lb output torque or 150 lb overhung load limits.

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