Double Start Flexure DS Series - Aluminum, Integral Clamp (31) 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. Typical Applications For high speed motion control systems, where fast response time is important. E.g., lead and ball screws, encoders resolvers, and anywhere high torsional stiffness is required. Misalignment Compensation 3 angular, .010 inch parallel offset, .008 inch axial motion FeaturesHigh torsional stiffnessLow radial loadsParallel misalignment capabilityLow inertia