The 17-4PH stainless steel couplings are ideal when high strength, excellent fatigue resistance, and high torsional stiffness are called for in an application. When compared to both 303 stainless steel and 7075-T6 aluminum, 17-4PH provides twice the torque. The couplings are machined from a solid piece of material. The W and H Series general purpose couplings are ideal for heavy duty uses such as pumps, lead screws, positioning systems, and processing equipment. The MC Series has higher torque capacity and torsional stiffness with two sets of flexures for increased parallel offset.