Abstract: Padlock made of a body cast as a frame block having a cylinder assembly space and shackle holes. The assembly space has securing members extending thereinto. A semi-circular shackle has a center portion and two ends which are slidable through the shackle holes and co-act with locking edges of locking bars. The locking bars together with operatively associated cam form the locking member unit which is housed in the assembly space. A cylinder assembly unit is operatively associated with the cam and comprises the usual pin and spring tumbler unit. A closing member seals the bottom of the padlock. Portions of the frame block can extend up around the shackle covering all but the center portion.