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parallel key

Flat keys are keys that rely on two sides as working faces and transfer torque by pressing keys and keyway sides. Flat keys can be divided into three types: ordinary flat keys, thin flat keys and guide flat keys. Ordinary flat keys have good alignment, high positioning accuracy and convenient folding, but they can not achieve axial fixing of parts on the axis, which is used for high-speed or impact-bearing, variable load axles; thin flat keys are used in thin-walled structures and places where the transmission torque is small; guide flat keys are fixed on the axle by screws, which are used in occasions where the parts on the axis move little.