A through pin assembly for securing an axle into a pair of mounting cheeks and to stabilize a machine member is disclosed. The pin assembly has an axle having a pair of end members formed on each end of the axle. A channel is formed through the axle and runs a length of the axle. The channel consists of a threaded area of the channel at the first end for use when removing the assembly; a hexagon, octagon or otherwise shaped area at the second end to interlock with the threaded part of the locking end member; two grooves in the channel, one at each end, as a seat for gaskets to seal off a grease or oil chamber for distribution to the bearing. A bearing is mounted on a central section of the axle. A pair of expansion sleeves is provided wherein one of the pair of expansion sleeves is positioned over each of the end member of the axle. A locking device is inserted into the channel. The locking device engages the pair of expansion sleeves causing the expansion sleeves to expand into a pair of mounting cheeks and stabilizing the machine member to secure the axle when a first end of the locking device is adjusted.