PECo offers a variety of Spur and Helical Master Gears and Master Worms for the purpose of composite gear roll testing and/or to serve as inspection machine calibration artifacts. Master Gears can be designed and manufactured to meet your specific application requirements or PECo can provide standard master gears up to and including ISO/DIN Q3, AGMA 2015-A3, and JIS quality standards. All PECo Master Gears are designed, manufactured, and supplied, complete with inspection certificates, to meet your specific application requirements.