Machine Keys, or Straight keys are made from hardened rod with a machined square or rectangular cross section, and are the most common type of key. They are installed into keyways to transmit torque from shafts to gears and other components. They are called “keys” because they lock a component to the shaft by means of a corresponding keyway in a shaft.
Machine Keys Diameters
Machine Keys are available on the FCH Network with Imperial/US diameters that range from #1 to 6 and with Metric diameters that range from M2 to M70. The length of Machine Keys is usually measured from the point to the underside of the head.