Mill, Pin, Mdl A630K, C/st, 100 HP, 8 TPHMill, Pin, Mdl A630K, C/st, 100 HP, 8 TPH. Al pin e Pin Mill, Type A630K.Unit is a Kolloplex stud mill with one rotating disc and one stationary disc. Rotor is 24" diameter within a 42" diameter chamber, carbon steel construction.