Ball bearing hinges have a steel ball bearing, or buffer, in between the knuckles. Heavier doors put more stress on the hinges so having the ball bearings reduce friction, are better performing and longer lasting. NON BALL BEARING HINGES Standard, or plain bearing, have no buffer between each knuckle of the barrel. This tends to wear the hinge down over time as the sections grind against one another and are better suited for lightweight doors.
Ball Bearing Square
Ball Bearing Radius
Non Ball Bearing Square
Non Ball Bearing Radius
Most interior doors are 1-3/8” thick and use 3.5″ x 3.5″ hinges. On an 1-3/4” door in an interior application Reeb will automatically utilize a 4” hinge.