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Cast iron speed reducer with C-face mounting, 40:1 ratio

Boston Gear

Boston Gear F7721-40-B5-G Speed Reducer 40:1 56C

SKU CH-JBKX-MJDRB

Worm speed reducer with 40:1 ratio, 56C C-face input, 44 RPM maximum output speed and 533 in-lb torque capacity

  • Delivers 533 in-lb output torque at 40:1 ratio
  • Runs at 44 RPM maximum output speed for precise control
  • Handles 0.5 hp input power with hardened steel gears
  • Cast-iron housing with tapered roller bearings ensures durability
  • Mounts at any angle using 56C C-face motor frame

Speed Reducer 40:1 56C

This Boston Gear speed reducer provides a fixed 40:1 gear ratio for C-face 56C motor frames. It delivers a maximum output speed of 44 RPM and up to 533 in-lb of output torque. The unit accepts a maximum input of 0.5 hp and suits applications requiring precise speed reduction in industrial machinery.

Worm Gear And Cast Iron Housing

The hardened and ground steel worm gear meshes within a cast iron housing for durability under continuous load. Tapered roller bearings support the output shaft, handling an overhung load capacity of 150 lb. The worm center distance measures 2.06 in with a base-to-center height of 2.28 in, defining the mounting footprint.

Round Output Shaft And Any Angle Mounting

A round output shaft allows direct coupling to driven equipment using standard keyed connections. The reducer operates in both clockwise and counterclockwise rotation without modification. Its any-angle mounting orientation simplifies installation in tight or unconventional equipment layouts.

Highlights

  • Delivers 533 in-lb output torque at 40:1 ratio
  • Runs at 44 RPM maximum output speed for precise control
  • Handles 0.5 hp input power with hardened steel gears
  • Cast-iron housing with tapered roller bearings ensures durability
  • Mounts at any angle using 56C C-face motor frame

Specifications

BrandBOSTON GEAR

Questions about this item

How often should I change the oil in this worm-gear reducer?

The unit is factory-filled with long-life synthetic lubricant; no oil changes are required for the life of the reducer.

What is the maximum continuous output torque before the 40:1 gear set becomes the limiting factor?

The hardened steel worm gear is rated for 533 in-lb of output torque; exceeding this value will cause accelerated wear.

How hot does the cast-iron housing get when the reducer runs at 0.5 hp all day?

The cast-iron housing dissipates heat from the 0.5 hp input; surface temperature will stabilise well within the lubricant's operating range.

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