Bore Door Handle
The main difference with a triple bore hole door is your.
Bore door handle. Use a drill driver with the 2 1 8 hole saw to bore a hole through the door. The latch bore also known as the edge bore is the hole drilled from the side of the door into the cross bore to allow the latch of the lock to be installed and to accommodate the sliding of the deadbolt. That means you need a deadbolt for the top hole and a front entry handle for the two holes below it. Most standard interior doors are 1 3 8 inches thick and the door is slightly beveled to make the closure into the jamb.
What if you have a triple bore hole door. Buy the correct door hardware for the application so the door handles for passage or privacy have the correct back set and bore. All the same benefits as above apply. Position it three feet off the ground.
The diameter of the latch bore is generally 1 to accommodate bolts from either mechanical or electronic locksets. Set the backset measurement to either 2 3 8 or 2 depending on the style of the door and personal preference. Once the center bit is through the door stop. A common request we get around our shop is for door knobs or levers made for the small 1 1 2 or 1 5 8 bore hole.
Standard door preparation for a door with both a door knob and a deadbolt have two sets of bore holes and cross bores stacked on top of each other at 5 1 2 from center to center like the diagram shown on the left it should have the exact preparation for the deadbolt as the knob below with a 2 1 8 diameter bore hole and 1 cross bore.