Non-markingNon-marking indicates that the wheel is made from a material that will not scuff and leave marks on the surface it is rolling on. This does not indicate whether the wheel will damage the surface it is rolling on.
StandardStandard tread allows more surface area of the tread to make contact with the floor surface than other styles of wheel tread, which allows the wheel to have a higher load capacity than wheels with a more rounded tread.
Number of WheelsThis indicates the number of wheels that are attached to the caster's axle. Single-wheel casters have one wheel. This is the standard design for casters.
Casters with two or three wheels spread the load evenly across the wheels, which reduces friction between the floor and the wheels. The weight capacity of the caster increases as the number of wheels on the caster increases.
Friction-Ring Stem Casters
Friction-ring stem casters have a stem that presses into compatibly sized holes on furniture or equipment. A spring ring at the end of the stem expands to hold the caster in place once installed in the hole or socket. Also known as grip-ring stem casters, friction-ring stem casters are used on furniture or equipment such as office chairs, tables, and medical equipment to create and maintain mobility. Friction-ring stem casters require few or no tools for installation, making them well-suited for applications requiring frequent caster replacement.
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