Kop-Flex, a brand of Regal Rexnord, specializes in designing and manufacturing high-performance power transmission couplings for demanding industrial applications like turbomachinery, pumps, steel mills, and paper machines. Their product line includes various types of gear couplings, such as the FASTS and Series H. The brand is known for its innovative solutions, patented technologies, and ability to engineer custom-designed couplings to meet strict industry standards and customer specifications.