General purpose, light to medium duty. An economical, maintenance free coupling, used in a variety of appli- cations. Helical's most popular coupling/couplHelical has over 40 years experience designing and producing Flexures for use in products ranging from encoders to spacecraft. Helical's many products are cost-effective and versatile. Here is a brief overview of the many variations of HELI-CAL Flexure products that can be used to control mechanical movement.Used for encoder/ resolver applications, low torque pump, lead screw and various other applications.