Helical A Series (Aluminum)General purpose, light to medium duty. An economical, maintenance free coupling, used in a variety of applications. Helical's most popular coupling.
Helical DS Series (Aluminum)Low inertia, high performance, aluminum coupling, using Helical double start technology. Torsionally stiffer and higher torque capacity than the “A“ series. Lighter with lower inertia than the “H” series.