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Industrial Casters Terms

Axle – Caster mechanism that, in conjunction with the nut or bolt, connects the caster wheel to the leg.
 
Bore Size – The amount of space required for caster wheel insertion.
 
Caster Wheel – The rolling caster part that provides movement to the equipment to which the caster is attached. Caster wheels are positioned between the legs of the caster and connected by the axle.
 
Dustcap – The enclosure in which the hardcap sits. The dustcap protects the raceway from foreign materials.
 
Frame – Caster part, also referred to as a “fork,” “yoke” or “rig,” inside of which the caster wheel rests. The frame consists of two legs to which the caster wheel is attached by means of an axle, nut or bolt and a top plate; swivel casters also contain a swivel bearing between the top plate and the caster legs.
 
Hardcap – The upper raceway that bears the thrust.
 
Hub – The caster wheel core.
 
Leg – Caster part that is connected to the top plate. Legs are also attached to the caster wheel by the axle.
 
Kingpin – In a swivel caster, the rivet inserted into a hole in the center of the top plate to connect the top plate to the rest of the swivel assembly.
 
Load Capacity – The recommended load that an individual caster can accept during standard operation conditions.
 
Mounting Height – Distance measured from the bottom of the unit to the rolling surface.
 
Offset – Distance measured from the center of the axle to the center of the attachment method.
 
Shock Load – The largest load a caster can handle under conditions of shock, such as bumps, uneven surfaces and the dropping of items onto the caster.
 
Spanner Bushing – The round, cylindrical stationary sleeve between the bracket legs, within the bearing and over the axle, through which the axle runs.
 
Static Load – The largest load that a caster can accept while stationary and under no exposure to shock.
 
Swivel Lock – Mechanism on a swivel caster that prevents the swivel from rotating but not from moving forward and backward like a rigid caster.
 
Swivel Raceway – Also known as a “swivel bearing,” it is the plate of a swivel caster located between the top plate and the legs that facilitates the swivel movement.
 
Thread Guard – Caster accessory that encases the wheel bearing and shields the caster wheel hub and frame from substances and materials, like threads, that might otherwise gather between the two caster mechanisms.
 
Top Plate – Also referred to as the “base plate” or “mounting plate,” it a part of the caster that connects the caster to the equipment and is located on top of the legs or, in the case of swivel casters, the swivel bearing. A rigid top plate contains four holes, one in each corner of the plate, while a swivel top plate contains an additional central hole through which the kingpin is inserted.
 
Yoke – A component that supports the upper and lower raceways.