Plate casters have a mounting style that uses a flat plate, typically square with holes at each corner, which is meant to line up with the mounting pattern found on an object. These holes form what is known as the bolt hole spacing (BHS), which is critical in mounting plate casters. Plates come in various styles and are meant for mounting to different objects, so it is important to ensure the bolt hole spacing on the plate caster is the same as the object it is being attached to. Sometimes plate casters are welded to the object, and in this case no bolt holes are necessary.

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