broken casement window lock mechanism : SWISCO.com

Home Owner from DeKalb, IL

Jan 18, 2026 9:58 am

My son broke the handle on the window locking mechanism when he left it open on a bitter cold night. I need to replace it, but can't find the part number. The casement window is made by Truth Hardware. The only number I see is on the arm, #30744.

3 user uploaded images

6 Replies

Casey from SWISCO

Jan 21, 2026 11:30 am

Hello,

I can't be sure with the lock still installed, but the 38-090 would be a good place to start. Take a look and compare the specifications below to determine if it would be a good fit. Thanks for posting!

Locked front view of 38-90

Unlocked rear view of 38-090

Home Owner from DeKalb, IL

Jan 27, 2026 9:48 pm

Thank you. Are there instructions somewhere regarding how to get to the screws to take the old lock off?

Casey from SWISCO

Jan 28, 2026 8:46 am

We don't have instructions for this part, but some windows that use it, such as yours, have a piece of trim covering the installation holes as shown in your second photo. This is a horrible design and, unforutnately, the only way we've found to access them is to drill two holes in the piece of trim covering the screw holes to access and remove them. Keep in mind that you'll neeed ot make the holes large enough to remove the screw head.

Home Owner from DeKalb, IL

Jan 28, 2026 10:44 am

OK, thanks. I appreciate your help!

Casey from SWISCO

Jan 28, 2026 11:02 am

It's our pleasure!