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Cast-iron worm speed reducer with powder-coated epoxy finish, indirect drive, 20:1 ratio

Boston Gear

Boston Gear 713-20-G Transmission Fluid 20:1 Ratio

SKU CH-4BMD-PABVX

A 20:1 worm speed reducer delivering 88 RPM output, 197 in-lb torque and 0.3 hp input capacity in a cast-iron housing

  • Delivers 197 in-lb output torque for heavy loads
  • 20:1 gear ratio reduces speed to 88 RPM precisely
  • Cast iron housing with powder-coated epoxy resists corrosion
  • Tapered roller bearings handle 200 lb overhung load
  • Hardened and ground steel gears ensure durable operation

Speed Reducer for Low-Speed Drives

The Boston Gear 713-20-G is a worm-gear speed reducer built for indirect-drive installations that demand a fixed 20:1 reduction. It delivers a maximum output speed of 88 RPM and a maximum output torque of 197 in-lb from an input rated at .3 hp. The cast-iron housing with powder-coated epoxy finish and tapered-roller bearings suits continuous industrial duty.

Build Integration and Mounting

The unit mounts on a 1.75 in base-to-center height with a 1.33 in worm center distance, aligning with standard bolt patterns for compact machinery frames. Its round output shaft accepts direct coupling to driven equipment without additional adapters. Rotation works in both clockwise and counter-clockwise directions, and the 200 lb overhung load capacity supports moderate side forces from pulleys or sprockets.

Included Hardware and Compliance Notes

The reducer ships assembled and lubricated, so no break-in procedure or initial fill is required. A California Proposition 65 warning applies because the product contains a chemical identified by the state as a carcinogen and reproductive hazard. No separate mounting kit, coupling or control module is bundled; those must be sourced to match the specific application.

Highlights

  • Delivers 197 in-lb output torque for heavy loads
  • 20:1 gear ratio reduces speed to 88 RPM precisely
  • Cast iron housing with powder-coated epoxy resists corrosion
  • Tapered roller bearings handle 200 lb overhung load
  • Hardened and ground steel gears ensure durable operation

Specifications

BrandBOSTON GEAR

Questions about this item

How long can the 20:1 reducer sustain its 0.3 hp input rating before thermal limits cut power?

The unit is rated for 0.3 hp maximum input horsepower and 197 in-lb maximum output torque; continuous operation at those levels is limited by heat dissipation in the cast-iron housing.

What noise and temperature rise should I expect when the gearbox runs at 88 RPM output all day?

Hardened and ground steel worms with tapered roller bearings run quietly, but the powder-coated cast-iron housing will warm to the touch under sustained 0.3 hp load.

Which mounting hardware and lubricant must I supply before installing the 1.33 in center-distance reducer?

The gearbox ships dry; you must provide SAE-rated worm-gear oil, mounting bolts for the base-to-center 1.75 in pattern, and a coupling for the indirect-drive input.

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