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Axel Nut
The
nut on the side of the leg that holds the thrust washers, spanner
bushings, and bolt or lube axles together.
Caster/Castor
A
pivoting roller attached to the bottom of furniture or trucks or
portable machines to make them movable.
Cotter Pin
A
small metal pin used to keep other parts from changing their position,
such as to keep a nut from turning, fastened in place by spreading
apart its ends after it is inserted
Fork Base
The
flat part at the top of the fork from which the legs extend. Serves as
lower raceway for main load bearing, and may provide a seat or upper
raceway for secondary load bearing.
Fork/Horn/Yoke
The
caster part which is comprised of legs plus a base (fork base of swivel
caster or mounting plate of rigid).
Kingpin
A
rivet, or threaded stud or bolt with nut, that holds the mounting plate
and fork assembly of a swivel caster together. Forged as an integral
part of mounting plate on higher quality casters
Kingpin Nut
The
nut on the bottom of a threaded kingpin or bolt that permits the
disassembly or adjustment of swiveling components; a maintenance
feature of better casters not found with rivet-type kingpins.
Legs
The
axle-support brackets extending down from the fork base of a swivel
caster, or from the mounting plate of a rigid caster.
Lube Bolt Axle
An
axle used to attach the wheel to the fork legs of a caster, containing
a lubrication hole allowing for lubrication of the spanner bushing
without disassembling the wheel from the fork legs.
Lubrication Fitting
A
fitting place into higher quality casters that allows for lubrication
of the bearings without disassembling the fork base, main, and load
bearings.
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Main Load Bearing
The
row of steel balls or rollers that swivels the fork base in relation to
the mounting plate of a swivel caster, and counteracts direct
thrust.
Mounting Plate
The
flat base, usually with four bolt holes, that forms the top of a caster
and permits attachment by bolting or welding to a flat
surface.
Raceway
A surface in which bearing balls or rollers rotate.
Rig
A swivel or rigid caster assembly less wheel, that may or may not include axle, nut or spanner bushing.
Secondary Load Commercial/Industrial Bearing
The
row of steel balls that rides in the raceway between the fork base and
secondary bearing retainer of a swivel caster to counteract component
thrust. It is this bearing that characterizes the popular
“double ball race” caster.
Secondary Load Precision Bearing
A
precision self contained bearing, usually a tapered roller bearing,
operating between the fork base and the kingpin of a swivel caster.
Constitutes the most efficient means of assisting swivel action by
counteracting component thrust.
Spanner Bushing
A
non-rotating sleeve of seamless steel tubing that fits over the axle in
many casters. Serves the dual purpose of providing a smooth inner
raceway for the wheel bearings, and strengthening the caster by
permitting the legs to be tightened against it.
Standard/ Solid Bolt Axle
An axle used to attach the wheel to the fork legs of a caster.
Thrust Washer/Retaining Washer/Combination Seal
A
steel washer between the hub ends of the wheel and the inside of the
caster legs. A steel washer pressed into the hub ends of some roller
bearing wheels to hold the bearing in place.
Wheel
A
round structure, solid disk or a rigid circular ring, that is designed
to turn around a center, normally an axle passed through the center of
the structure. Caster wheels come in a wide variety of materials, sizes
and treads. Often Caster wheel type is synonymous with the material
makeup or specialized tread pattern exhibited by the wheel.
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