Locks For Casement Crank Type Windows

Securing Your Casement ("Crank") Windows:

securing a casement window from burglars

A casement (or “crank”) window that is strong and in good condition may not need a lock. If the window is big enough to admit a person, open it part way, remove the crank and set it out of reach (right). Weak windows however, can be easily forced. Sashes offer only token resistance to break-ins if they wobble when you crank them, rattle in high winds, or that have to be propped open.

Many casement windows won’t open enough to admit an adult. To check, fully open the sash and measure the clearance. If it’s less than 6 ½ inches, only a very slim person could squeeze in.

If you prefer a lock and key, choose a casement window lock similar to this one. Use screws to install it along the sash rail. Keep the key nearby so you can get out in an emergency.

The same chain locks used with doors can keep windows from opening more than a few inches, just enough to let in a breath of fresh air. Fasten it to the sash and frame with the longest screws the sashes will accommodate.

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