1. Bearing selections

Most common bearing selections are:

Bushing	Ball bearing	Roller bearing

Bushing (sleeve): Metal sleeve is inserted in wheel and rests directly on axle. Only recommended when rolling ease is less critical.

Ball bearing: Theoretically, ball – raceway contact is limited to occasional. Ball bearings are the most widely used in industry because they feature the best performance / price ratio. They are found in wheels, car transmissions, farming machinery, machine tool spindles, etc. If the gap clearance is increased, angular contact is obtained; the bearing can now bear increased axial loads and performance levels are enhanced.

Roller bearing: Roller – raceway contact is theoretically linear. The roller bearing is capable of carrying a greater load than the same size diameter ball bearing. It has a split outer race shell into which the roller assembly is inserted.

2. Swivel head's bearing option

Depends on the load capacity, the Swivel head can be made different. Detail is as follow:

Light & medium duty Caster	Heavy duty Caster	Extra heavy duty Caster

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Light & medium duty Caster: The Swivel head has double ball raceway of steel balls that slide together.

Heavy duty Caster: Also with double ball raceway but of course the steel bracket is slightly thicker. Besides people can enhance the raceway or put Manganese ring to support the steel ball.

Extra heavy duty Caster: The Swivel head is combined of Flat and Cone bearing. This will ensure light and smooth rotate even when we are having maximum load.