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Cast iron worm gear speed reducer with 56C C-face mount

Boston Gear

Boston Gear F713-50-B5-G Speed Reducer 50:1 56C

SKU CH-81Z8-8TNC1

A worm-gear speed reducer with a 50:1 ratio, 56C motor frame, 35 RPM maximum output speed, 0.16 hp input power and 205 in-lb output torque

  • 50:1 ratio reduces output speed to 35 RPM for precise control
  • Cast iron housing with hardened steel gears handles 205 in-lb output torque
  • Tapered roller bearings support 150 lb overhung load for radial durability
  • 56C C-face input mounts directly to standard NEMA motors
  • Any-angle mounting orientation suits flexible installation layouts

Speed Reducer 50:1 for 56C Motor Frames

This Boston Gear F713-50-B5-G unit provides a 50:1 gear ratio with a C-face input for 56C motor frames. The cast-iron housing contains hardened and ground steel worm gears on tapered roller bearings. It delivers up to 205 in-lb of output torque at a maximum output speed of 35 RPM.

Replaces Direct-Drive

The 50:1 reduction multiplies motor torque significantly while dropping speed to 35 RPM, making the jump worthwhile for conveyors, feeders or positioning axes that need high torque at low speed. The 0.16 hp input limit means it suits fractional-horsepower motors only; applications requiring more input power need a larger centre-distance reducer.

Worm-Gear Constraints Limit Continuous Duty

The worm gear set self-locks under load, preventing back-driving but also limiting efficiency compared to helical or planetary types. Continuous operation at the 150 lb overhung load rating generates heat that the cast-iron housing must dissipate without forced cooling. Mounting at any angle is allowed, yet lubrication level must be maintained for the 1.33 in worm centre distance and 1.75 in base-to-centre height.

Highlights

  • 50:1 ratio reduces output speed to 35 RPM for precise control
  • Cast iron housing with hardened steel gears handles 205 in-lb output torque
  • Tapered roller bearings support 150 lb overhung load for radial durability
  • 56C C-face input mounts directly to standard NEMA motors
  • Any-angle mounting orientation suits flexible installation layouts

Specifications

BrandBOSTON GEAR

Questions about this item

What mounting dimensions does the 1.33 in worm center distance and 1.75 in base-to-center require?

The unit needs a flat surface with bolt holes spaced for a 1.33 in worm center distance and a 1.75 in base-to-center height, compatible with a 56C motor frame.

How do I install the speed reducer onto a 56C motor, and what step is commonly missed?

Align the C-face input with the motor shaft, secure the mounting bolts, then verify the key is fully seated in both the motor shaft and the reducer input bore — a step often skipped.

What maintenance does the cast-iron housing with tapered roller bearings and hardened steel gears require?

Check the oil level through the fill plug before first use and at regular intervals; replace the lubricant if it becomes contaminated or after extended high-load operation.

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