Abstract: A sequence dependent push-button lock mechanism having compression loaded locking rod assemblies, arcuate segments of which are placed in compression if attempts are made to force the lock open, and unlocking by rotating the arcuate segments out of compression engagement with a sliding block associated with a thumb-actuated reciprocating shackle sleeve, particularly adapted for use in padlocks and deadbolt/cabinet locks. The locks are applicable to use in combination with pivot-only shackles in the padlock form, and thumb-actuated shackle or deadbolt release mechanisms. The thumb latch is of a break-away type to deter plurality of holes in a spaced array for receiving spring biased automatic return push-button assemblies which actuate locking rods that are disposed to rotate upon selective engagement with various combinations of special "T" and "C" shaped flanges on button actuator members.