This is a top, center mounted, adjustable, roller assembly. The 1 in. flat nylon roller is attached to a stamped steel housing mounted on top of a 5/16 in. threaded steel rod. Used on Like closet doors 3/4 in. to 1-3/8 in. thick, it threads into a top bracket like Prime-Line part N 6797.
This is a bi-fold door guide wheel features a spring-loaded design allowing for self-adjustment while in the track for smooth operation. The guide wheel fits a 1 in. to 1-3/8 in. thick bi-fold door.
This is a bottom mount pivot used on Cox and a variety of other bi-fold door manufacturers. The 7/16 in. diameter nylon base houses a 3/16 in. pivot with a hex head nut for adjustment. It fits 1 in. to 1-3/8 in. thick bi-fold doors weighing up to 30 lbs. each.
This bi-pass door roller assembly is constructed from nylon. It features a 1-1/2 in. ball bearing roller with an adjustable aluminum-housing bracket. Monarch Door Company uses this type or roller for 500 series aluminum frame doors.