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This Rev-A-Shelf 4BS-series swivel bearing is the rotation hardware at the heart of a kidney or D-shaped lazy Susan, engineered with a built-in stop to control how far the shelf travels in each direction.
A kidney or D-shaped lazy Susan is not meant to rotate freely all the way around. The shelf is sized to clear the cabinet door and the center post, and unrestricted spin would drive the shelf into the door opening or the cabinet frame. The stop built into this bearing limits the arc of travel so the shelf moves through its intended range and stops short of the cabinet structure. That single mechanical detail is what makes a D or kidney shelf usable day to day, and it is the reason this bearing is not interchangeable with a full-circle no-stop bearing in the same installation.
Cabinet lazy Susan bearings do not carry the kind of impact load that calls for steel, and aluminum keeps the hardware light without giving up the rigidity needed for a rotating shelf. The 10-inch diameter distributes the shelf's load across a wider center contact than a smaller bearing would, which is the right call when the shelf set is sized for a full-depth base cabinet. The bearing sits between the shelf and the center pole hardware, so a smooth, consistent surface finish on the aluminum also matters for long-term rotation quality.
This bearing suits two kinds of jobs. In a new cabinet build, it is the rotation component a woodworker or cabinet shop installs as part of a D-shaped lazy Susan system. In a repair situation, it replaces a worn or damaged bearing in an existing kidney or D-shaped unit where the original hardware has developed slop or resistance. Either way, confirm that the existing or planned shelf is a kidney or D-shaped profile and that the center post and shelf hardware are compatible with a 10-inch bearing before ordering. For a 7-inch bearing in the same 4BS series with stop, or for a full-circle bearing without stop, separate SKUs are available in this family.
No. The stop mechanism is built for kidney and D-shaped shelves that need a limited arc of travel. A full-circle lazy Susan requires a no-stop bearing so the shelf can rotate continuously. Using a stop bearing on a full-circle shelf will prevent the shelf from completing a full rotation.
The 4BS series includes a built-in rotation stop, making it the right choice for kidney and D-shaped shelves. The 4B series does not have a stop and is designed for full-circle lazy Susans that rotate freely.
This SKU sells as a single bearing. Most lazy Susan installations use one bearing per shelf level, so order based on the number of shelf tiers in your unit.
It can replace a worn 4BS-series bearing in a kidney or D-shaped lazy Susan. Confirm the diameter and that the existing unit uses a 10-inch center bearing before ordering the replacement.
Specify this 10-inch aluminum swivel bearing when the job calls for a kidney or D-shaped lazy Susan that travels a controlled arc and stops cleanly at both ends of its rotation.
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