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This Rev-A-Shelf 4BS swivel bearing is the aluminum rotation hardware for kidney-shaped and D-shaped lazy Susan shelves, featuring a built-in rotation stop that prevents over-spin and keeps shelves in their correct sweep position.
A kidney or D-shaped lazy Susan occupies only part of the cabinet's arc, so it needs a bearing that limits how far the shelf can rotate. Without a stop, a non-round shelf can swing past its intended sweep and jam against the cabinet face frame or door, damaging both. The 4BS bearing puts a mechanical limit on the rotation so the shelf travels through its designed arc and comes to rest in the correct position every time. It is the right choice for any installation where the shelf shape requires a controlled sweep rather than a full 360-degree spin.
The bearing is machined from aluminum, which keeps it lighter than comparable steel hardware and resistant to the humidity and temperature swings typical inside a kitchen cabinet. Aluminum also means there is no painted or plated surface to chip, flake, or corrode over years of regular use. The 4BS series uses this material consistently across its diameter range, so the hardware performs the same at the beginning of its service life as it does years into regular use.
Cabinet shops building new corner units with kidney or D-shaped shelves reach for this bearing as the standard rotation hardware for that shelf format. It also serves renovation and retrofit work well, since D-shaped and kidney Susan shelves often outlast their original bearings and need replacement hardware that matches the correct stop geometry. The 8-pack quantity suits both scenarios: a shop running several corner cabinet units at once can pull from the same box, and a service call requiring a single bearing leaves extras on the shelf for the next job.
The 4BS includes a rotation stop; the 4B does not. The stop is required for kidney and D-shaped shelves, which cannot rotate freely without hitting the cabinet. Full-circle shelves use the 4B, which allows unrestricted 360-degree rotation.
No. The rotation stop on the 4BS is built for the limited arc of kidney and D-shaped shelves. For full-circle shelves, use the 4B bearing, which allows continuous rotation without a stop.
Each order includes 8 bearings.
Yes. The 4BS series is also available in a 10-inch diameter for installations where a larger bearing footprint is required.
The 4BS-7-8 gives kidney and D-shaped lazy Susan shelves the aluminum swivel hardware and built-in arc control they need, in an 8-pack quantity that keeps a build or a retrofit moving without a second order.
Sold In: 8 Each
