Installing Electromagnetic Locks on Non-Standard Thickness Doors
When you need to install an electromagnetic lock on a door of a thickness other than the standard 1-3/4 inches on an outswing application, the only part that is really affected is the sex nut or sex bolt - the fastener that holds the armature onto the door. Why this is important is because electromagnetic locks are packed standard with a sex nut for 1-3/4 doors and longer sex-bolts may be available only at extra charge.
Securitron calls their armature fasteners sex bolts instead of sex nuts and does not offer them in lengths. In the past I have adapted their GDB Glass Door Bracket for use on extra thick doors with success. The GDB is designed to be glued onto glass or Herculite doors, but since the armature attaches to the plate instead of the door, the installer can adapt the plate to be fastened to any type or thickness of door and thereby give themselves a way to install Securitron on extra thick door applications. This method does not conform to manufacturer's specifications.
Although it will not help you install a mag on a non-standard thickness door application, the Securitron EASB Energy Absorbing Sex Bolt bears mentioning, since we are talking about armature fasteners. The EASB is essentially a great big sex bolt. Use the EASB in high security applications where the exposed armature fastener on the outside of the door may be subject to attack.
RCI (Rutherford Controls International) calls their armature fasteners Armature Bolts and they offer them in three sizes to accommodate up to 3 inch doors.
- ARMB255 accommodates door thicknesses from 1-3/4 inches to 2-1/4 inches.
- ARMB270 accommodates door thicknesses from 2-1/4 inches to 2-3/4 inches
- ARMB280 accommodates door thicknesses from 2-1/2 inches to 3 inches
Bottom line: make sure you measure the door thicknesses whenever you do a site survey, or ascertain the door thickness from the door provider for new construction.