Caster Parts & Nomenclature
Stems – An attachment method comprised of a threaded post, round post, square post, or grip ring post. These stems offer a wide variey of options to work with a range of products.
Top Plate – A flat, horizontal plate, usually with four bolt holes, which are used to attach the caster to the equipment. The caster is then bolted or welded onto the equipment.
Kingpin – (Staked kingpin, or nut & bolt assembly, or integral kingpin assembly). A threaded nut & bolt or staked assembly which holds the swivel assembly together. An “integral” kingpin and top plate are of a one piece contruction. Threaded kingpins can be attuned to balance for wear in the swivel assembly.
Swivel Bearings – Many construction styles include the following: Single Level Ball Race – A single row of balls in a large diameter ball raceway. Double Ball Race – Two separate rows of balls moving independently through two levels of ball races.
Swivel Yoke – A swivel yoke attaches to a cart, includes a swivel bearing unit. It does not include wheel, wheel bearings, washers, axles, nuts, or spanner bushing components. Typically used in conjunction with a roller bearing or in a plain bore assembly. Also called horns, rigs, and swivels.
Rigid Yoke – A rigid yoke attaches to a cart, includes a rigid or stationary horn unit. It does not consist of the wheel bearings, washers, axles, nuts, or spanner bushing components. Also called, horns, rigs, or rigids.
Complete Wheel – A wheel that has bearings installed
Blank Wheel – A wheel without bearings installed (plain bore)
Brake Kit – There are various type brakes used on casters. There is the tread type brake that locks the wheel, total lock brakes that lock the swivel and the wheel at the same time, there are position and directional locks for locking casters in a specific direction while in use.
Axle & Nut – A reuseable fastening system to asseble casters. Preferred in applications where the wheel could use replacement or maintenance.
Rivet – A permanent steel rod to assemble casters. Preferred in economic applications where wheels typically will not get replaced.