Patent ID: 8162580

Claim:
An anti-theft fastener comprising: at least one shearing head, and each one of the at least one shearing head having an inner surface; a mounting tube being formed on and protruding from the inner surface of the shearing head and having an annular surface; and at least one shearing tab being formed on the shearing head; and a shaft being threaded and connected with the at least one shearing head and having at least one shearing end, and each one of the at least one shearing end being connected with the mounting tube of one of the at least one shearing head; and at least one fastening element, and each one of the at least one fastening element being mounted around the mounting tube of one of the at least one shearing head and having a connecting hole being formed through the fastening element around the mounting tube of the corresponding shearing head; an outer surface having a countersink being formed in the outer surface around the connecting hole; an abutting surface being formed in the countersink around the connecting hole; and at least one shearing recess being formed in the abutting surface, corresponding to the at least one shearing tab on the corresponding shearing head, and each one of the at least one shearing recess having at least one shearing surface, whereby the at least one shearing tab on the corresponding shearing head is broken off by the at least one shearing surface abutting the at least one shearing surface on the corresponding shearing head.