Ruland disc couplings are torsionally stiff, have low inertia, and operate with zero-backlash. They have a balanced design for smooth operation at speeds up to 10,000 RPM. These double disc couplings are comprised of two anodized aluminum hubs, an acetal plastic center spacer for electrical isolation, and stainless steel disc springs. Single disc couplings are ideal for compact installations while double disc styles allow for higher misalignment capabilities. All disc coupling hardware is metric and tests beyond industry standards for maximum performance capabilities. They are machined from solid bar stock that is sourced exclusively from North American mills.