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For buyers reading a spec sheet or replacing a failed part.
The wheel hub is the center section of the wheel that houses the bearing and axle. Hub width…
A dust cover is a small cap or seal that fits over the bearing assembly to keep dirt,…
A thread guard is a disc or shield mounted next to the wheel that keeps loose thread, string,…
The yoke (also called the fork) is the metal frame that holds the wheel axle on either side…
Swivel lead (also called trail) is the horizontal offset between a caster's swivel axis (where it pivots) and…
Swivel radius is the distance from a caster's swivel centerline to its outermost point while rotating — effectively…
The raceway is the hardened track that a caster's swivel bearings ride in. On a kingpinless caster, it's…
A wheel bearing is what lets the wheel spin smoothly around its axle. Caster wheels use several bearing…
A ball bearing wheel uses a ring of steel balls between the axle and hub to let the…
A roller bearing wheel uses cylindrical rollers instead of balls between the axle and hub, spreading load over…
A tapered roller bearing wheel uses angled (tapered) rollers that handle both straight-down (radial) load and side-to-side (thrust)…
A plain bore bearing (often Delrin, a low-friction plastic) is a simple bushing with no rolling elements —…
A precision bearing is built to tighter manufacturing tolerances than a standard ball or roller bearing, giving smoother…
The axle is the pin or rod that runs through the wheel hub and yoke, letting the wheel…
A swivel lock is a mechanism that holds a swivel caster's rotation fixed in one direction, temporarily turning…
