Profile: Hayes Mfg., Inc. is in the business of designing, manufacturing, and patenting new designs for aluminum (shaft-to-shaft) couplings, splined adapters and flywheel couplings. We are ISO 9001:2000 certified. Our flywheel coupling absorbs vibration and shock to provide a steady dampening effect. We offer pump mount plates for the entire pump mounting needs such as black, yellow and tan.