Through bolt mounting

"Through-Bolt" is the most common type of mounting. In a through-bolt mounting, a screw is inserted through the surface to which the knob or pull is affixed into a threaded hole in the base of the knob or pull.

The screw should be at least 3/16” longer than the thickness of the surface to which the hardware is mounted, but no more than 3/8” longer.

If the screw is too short, the hardware cannot be fastened securely; if it is too long, the hardware will not tighten down snugly.


Colonial supplies two different length screws with every piece of hardware – 1” for cabinet doors and 1 5/8” for cabinet drawers.