Circle Gear & Machine Co.'s full line of gear manufacturing services includes internal gears, in addition to our selection of conventional, external gears. Internal gears, with teeth located on the inside as opposed to the outside of the gear, are used in all industries, from military/government to electronics and chemical applications. We also serve customers in the medical, automotive, biotechnology, and packaging industries. Our internal gears can be produced in diameters up to 42", with a maximum diametrical pitch of 2.5, and a maximum module of 10.

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