High Quality ring and pinion gear sets manufactured by US Gear are now available through Callies.  Every  US Gear is produced from American steel in their Chicago facility.  With hundreds of various combinations that are purpose built for rigorous High Performance applications US Gear is sure to have what you need.   High Endurance 9310, 8620 and 4320 steels are precisely machined and finished to eliminate noise and surface spalling.

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