Castor Terminology

Swivel Castors

An assembly in which a housing containing a wheel is free to swivel without restriction about the vertical axis of the swivel bearing with the castor wheel axle offset.

Fixed Castors

An assembly housing a wheel which cannot swivel about its vertical axis.

Wheels

A revolving centre rotating freely on an axle of which the external part (in contact with the ground) can be constituted by the material of the wheel itself or by various other materials.

Tractive Resistance

The effort required to move a piece of equipment fitted with castors: this is usually expressed a percentage of the total load carried.