Single actions (left) and double actions (right) come in nearly every shape and size. Make sure your new latch has the correct backset length (the measurement from the edge of the door to the center of the bore hole), and just follow the installation instructions. In addition, a single tube double track tunnel of approximately 12m diameter excavates less material than twin parallel single tube tunnels of 6-7m diameter each, and uses less concrete material in its precast segmental lining.
Some door hardware comes with an adjustable backset, but most does not and will need to be specified. You can see the bore hole that is 2-1/8" in diameter. The door-prep image seen to the left applies to any standard tubular lock or latch set including interior door knobs, door levers, deadbolts, entry door handle set, and door handle plates. 1-3/4" Knob diameter 1-7/8" Rose diameter 2-1/4" Lever length with 2" projection. Pre-hung doors are heavy and hard to manage. To determine if a single door is Left Hand, Right Hand, Left Hand Reverse, or Right hand reverse, stand on the outside (Keyside) of the door. A traditional single-cylinder deadbolt features a keyhole on the exterior side of the door and a thumbturn on the interior side. These designate product type, bore size and stroke length, and options (options are written in the following order: rod end options, and special options with The cross bore is the main hole drilled into the face of the door where the body of the lock (chassis) is installed. Lock Bore The diameter of the hole for the lock body. Deadbolts can be a single cylinder or double cylinder. Instead, the door is locked or unlocked using a thumb-turn style lever. A choice of single or double bore options are available in different “backset” positions (the placement of the handle or lockset from the door edge). The two main reasons for this are efficiency and economy. If the hinges are on the left and the door opens inward (Away from you) it is a left hand door. Our bores include mortising the edge of the door for the latch (latch and dead bolt for double bore), and mortising for the “strike plate” on the jamb leg where the latch inserts (or latch and deadbolt for double bore). 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 … See diagram to the left for clarification.
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