This is a F-tab patio door roller assembly with a 1-1/4 inch concave or grooved steel ball bearing roller. When the corner screw passes through the F-tab the assembly is captured by the side stile and bottom rail as the screw draws the two sides together. The housing is 5/8 inch wide with a 11/16 inch flare, 1-1/4 inch tall with a rear adjusting screw. Replaces the old style Couples door roller and is used by a variety of patio door manufacturers.
1-1/4 inch concave (grooved) steel roller
Ball bearing
F-tab housing with rear adjust
When the corner screw passes through the F tab the assembly is captured by the side stile and bottom rail as the screw draws the two sides together
Housing is 5/8 inch wide with a 11/16 inch flare, 1-1/4 inch tall and 1-27/32 inch long (not including the inner roller housing)