Lockwood 303/355 Jemmy Proof Deadbolt Prevents Door Jamb Spreading - Thwarting One Of The Most Common Non-Destructive Door Bypass Techniques

The Lockwood 303/355 range of surface/rim mounted deadbolt locks offers a unique security product that effectively connects your door and frame together, preventing a common door bypass technique known as frame spreading.

You may have heard or seen an old product that has been around for many years known as the Segal Jimmy Proof Deadbolt.

The product has been loved for over a hundred years by many dwellers for its simplicity and its security.

The Jimmy Proof deadlock uses two pins that drop vertically through a two ringed strike plate, physically attaching the door to the frame/jamb. The lock usually holds to the door with 6 screws, 2 for the outer cylinder and four for the body of the deadlock.

The product pictured here is the Australian Lockwood 303/355 Claw Bolt Rim Deadlock, that uses 2 screws though the inside plate assembly to attach to the external key cylinder and a further 4 screws to attach the plate to the door. It also uses additional side mounted screws to attach the deadlock body to the internal plate.

The strike plate consists of a two part unit, with two hardened metal rings and a cover plate that are attached with 3 long screws anchoring the strike to the jamb. The separation of the two parts on the strike adds a laminating effect which further increases the strength of the application.

We also include an image of the Bilock Extreme Security Rim Cylinder, which can be used externally to provide 100% Bump Proof and virtually Pick Proof external keyed access.

The product is a highly sought after incredibly strong deadlock that increases your security tremendously. Not especially beautiful, but available in Satin Nickel or Mahogany Brown, if you dont mind having a large deadbolt on your door, you can rest assured that the security is second to none, worldwide.

Other manufacturers over the years have produced similar products, like Yale and Abloy. The Abloy SuperStopper version was a Black Steel Super-Hardened Body with Stainless Steel Turn Button and Stainless Steel Strike Plate. It was quite expensive and saw few sales in it's time before being discontinued. I have installed both the Lockwood version and the Abloy version during my career. I have also installed the Yale and the Segal a few times too.

If you use hinge pins to secure the hinge side of your door (which will prevent a would be intruder from pulling your door off by simply removing the hinge pins) and a Lockwood 303/355 Jemmy Proof Rim Deadlock, you can rest assured that your door will continue to be physically attached to the door jamb and will provide significantly increased security for your dwelling