Installing Locksets and Dead Bolts
1. Position the Template. Most doorknobs are 34 to 38 in. high, with dead bolts 6 to 12 in. above that. Decide for yourself what height is comfortable. When drilling new holes, tape the manufacturer's template in place with the lockset centerline at the desired height. Determine the backset—the distance from the door edge to the knob centerline—and use the corresponding template marks. The backset can be 2 3/8 or 2 3/4 in.; many locksets accommodate both. Then drill 1/8-in. pilot holes through the door to center the 2 1/8-in. hole saw. At the door edge, use the template to drill a 2-in.-deep pilot hole for drilling for the strike or bolt. 2. Drill the Door face and mark the jamb. Using a drill with a bubble level or a torpedo level taped on top, drill halfway through the door from each side with the hole saw to prevent blowout splintering. Then mark the doorjamb for the strike plate by closing the door, inserting a nail from inside the 2 1/8-in. hole through the strike pilot hole and pushing it into the jamb. 3. Drill the jamb and door edge. With the nail mark as an indicator, drill a 5/8-in.-deep hole for the strike or a 1-in.-deep hole for the dead bolt using the 1-in. spade bit (sizes vary, so check instructions). In the door edge, use the pilot hole to guide a 1-in. spade bit and drill through to the large hole where the cylinder will sit. 4. Chisel the jamb and door edge. Hold the latch assembly up to the door edge and score its outline deeply with a utility knife. Do the same for the strike plate on the doorjamb. Then score the wood to be removed at 1/4-in. intervals with a chisel, removing enough wood so the strike box sits flush with the door edge and the strike plate sits flush with the doorjamb. 5. Install the Hardware. Insert the latch assembly in the hole you drilled in the door edge and fasten it with screws after predrilling for them. Next, insert the handle set and cylindrical lock or dead bolt assembly so the spindle or tailpiece aligns with the strike assembly. Typically, screws pass through the door to hold the two lockset pieces together on opposite sides. For security, be sure exposed screwheads are on the interior side of the lockset.
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