Profile: Jinan Welle Metal (CHINA) Products Co.ltd specializes in manufacturing complex metal parts. We are an ISO 9001 certified company. Our products include shafts, rods, connectors, valves fitting and OEM industrial products. Our products are widely used in agriculture, automotive OEM parts, packaging equipment, fiber optic equipment, conveyor systems, AC/DC motors, industrial machinery, medical equipment, snow removal, and material handling equipment. A shaft is a tool that transmits both torque and power. It comes in a range of shapes and sizes, but most of them have circular cross-sections that are solid or tubular. A power transmission shaft is used to deliver power from a driving device or a power source to a load. These can be outfitted with gears, pulleys, and sprockets to transmit rotary motion and power to mating gears, belts, and chains. A shaft can also be connected to another shaft via a coupling device. A key, keyway, or keyseat is used to attach couplings to a shaft.