This article introduces seven manufacturers of harmonic drive reducers, primarily companies from China and Japan.

The FHG-SJ series strain wave gearbox is engineered for high-torque and heavy-load applications, featuring compact axial dimensions compared to conventional reducers. It incorporates a top-hat style flexspline and an integrated cam wave generator, where the cam shaft bore is customizable to match specific motor models. The input shaft directly interfaces with the wave generator’s inner bore via a keyway connection. This series typically employs a fixed flexspline end and an output circular spline end configuration.

The FCG-AJ series strain wave gear is engineered for high-torque and heavy-load applications. It adopts a cup-style flexspline and an integrated cam wave generator, where the cam shaft bore can be customized to match specific motor models. The input shaft directly interfaces with the wave generator's inner bore via a keyway connection. This series typically employs a fixed circular spline end and an output flexspline end configuration.

The FSG-II series strain wave gear utilizes a cross slider coupling mechanism for its wave generator. The cam shaft bore dimensions can be customized to accommodate specific motor models. The input shaft directly engages with the wave generator’s inner bore through a keyed connection. This configuration is typically implemented with the circular spline fixed at the base and the flexspline serving as the output end.