Kaba Group 535-53-51 Double Cylinder Jimmy Proof Deadbolt With Angle Strike door lock

Surface-Mounted Double-Cylinder Deadbolt

The Ilco 535-53-51 is a surface-mounted jimmy-proof deadbolt designed to secure a door directly to the jamb and resist forced entry. It operates with a key on both the interior and exterior sides using a 5-pin tumbler mechanism. The unit includes an angle strike and two keys, and it fits doors ranging from 1-1/4" to 2-1/4" thick. This lock suits residential or commercial doors where through-bore installation is not preferred.

Anti-Pry Vertical Bolts Under Force

Two vertical bolts engage the angle strike to distribute attack loads across the door and frame rather than concentrating stress at a single latch point. Because the lock body sits on the surface, the mounting screws absorb shear forces directly, and the double-cylinder design prevents manipulation of the interior thumb-turn through broken glass or adjacent openings. The 5-pin cylinder maintains consistent operation through repeated locking cycles without electronic components that could fail.

Verify Door Thickness and Keying Needs

Confirm the door slab measures between 1-1/4" and 2-1/4" thick so the supplied hardware reaches both faces securely. Ensure the frame can accept the supplied angle strike without modification to the jamb profile. Buyers who require single-cylinder egress or a thumb-turn inside should select a different model, as this unit demands a key for every operation from either side.