This Boston Gear RA631 right angle spiral bevel gear drive has a 1:1 ratio three-way shaft to transmit torque between perpendicular output shafts to provide rotational power to another part of a motorized system. This permanently lubricated gear drive has an aluminum alloy housing for light weight and resistance to corrosion, integral lip seals to retain lubricant and protect against contamination, and an operating temperature range of 50 to 125 degrees F (10 to 52 degrees C). The spiral bevel gears have hardened teeth for applications where hardness and strength are needed to transmit torque and motion, and the 35 degree spiral angle makes this drive better suited for higher speed and larger torque applications than drives that have straight bevel gears. This Boston Gear spiral bevel gear drive has a 50 lb. thrust load and is suitable for use in a variety of commercial and industrial applications, such as construction equipment, aeronautics, conveyors, and manufacturing equipment, among others.

Bevel gears have a blunt-end cone shape with teeth along the cone face and are used for transmitting torque and motion between perpendicular rotating shafts. A bevel gear's pressure angle, spiral angle, diametral pitch (also called DP or pitch), and its material are important factors to consider. A bevel gear is part of a set of two gears, and the gear ratio for the set is determined by the number of teeth on each gear. Gears come in several types for use in different power transmission configurations and for different applications, including spur gears (for rotating shafts parallel to each other), change gears (to increase or decrease torque and speed), helical gears (for high rates of rotational speed), internal gears (where one gear is nested inside the other), rack and pinion gears (for turning rotational motion into linear motion), and worm gears (for perpendicular shafts in tight spaces and quiet operation). Gears are suitable for use in the agriculture, automotive, construction, mining, and packaging industries, and can be found in a variety of machines, including bicycles, automobiles, and elevators, among others.

Boston Gear manufactures gears, gear drives, bearings, valves, shaft collars, couplings, and other power and fluid transmission components. The company, founded in 1877, is headquartered in Charlotte, NC, and meets International Organization for Standardization (ISO) standard 9001:2008 standard.