Abstract: The radially reciprocating lock includes an elongate, hollow cylindrical housing having a locking mechanism disposed therein. The locking mechanism includes an axially extending lock shaft and at least one crank disk attached to the shaft. A recess is formed in at least one end of the lock shaft for insertion of a key or tool to rotate the lock shaft and the crank disk. At least one endcap is provided to securely cover an exposed end of the housing. The endcap includes a center hole for passage of the lock shaft end. At least one locking member is operatively connected to the crank disk to radially reciprocate between an extended, locked position and a retracted, unlocked position through respective slots on the housing. A crank linkage mechanism and a cam mechanism are provided to reciprocate the at least one locking member.