Find machine key stock at JLCMC, including rounded machine keys (square/round-square), machine keys, precision, threaded, and long machine keys. All are cost-effective and available for same-day shipping. Machine keys are typically installed in the keyways of shafts and connecting components, and play a crucial role in torque transmission, preventing rotational slip, and securing the relative positions between the shaft and the connected parts. They are widely used in industries such as conveyor systems, machinery, industrial applications, and automation, including gears, engines, pumps, compressors, and conveyors. Due to their efficient and reliable torque transmission capabilities, ease of replacement, and cost-effectiveness, machine keys are an indispensable foundational component in modern mechanical equipment.