Caster TerminologyCaster Terminology Diagram



Load Weight (Load Capacity)

The heavier the load, the larger the wheel required for the caster. The weight of the load also influences the mobility of the wheel. 

Light Duty = 0-80lbs. (0-35Kg.)

Standard Duty = 0-200lbs. (0-90Kg.)

Medium Duty = 200-300lbs. (90-135Kg.)

Heavy Duty = 300-500lbs. (135-225Kg.)


Load Height

The vertical distance between the floor and mounting point of the equipment.


Offset or Lead

The horizontal distance between vertical center lines through the king pin and wheel center.


Swivel Radius

The horizontal distance from the vertical center line of the king pin to the outside edge of the wheel tread. This dimension specifies the minimum distance required for the caster to swivel 360 degrees when mounted.


Stem Caster vs. Plate Caster

Stem casters are either threaded for mounting to a tapped mounting plate or designed with a rubber expanding applicator for mounting the caster to tubing. The construction of the applicator is designed to provide maximum compression against the inside of the tubing thus assuring a securely assembled caster. Plate casters are provided with a plate pre-drilled with four bolt holes to mount to any desired application.


Rigid Casters

Rigid Casters have no swivel effect. Sturdy plate is fixed directly to caster arm.


Brake and Non-Brake Casters

Items with brake are specified in product listing. All brakes are easy to engage and disengage.


Wheel Bearings

Wheel bearings may be either Sintered or Ball Bearing Type. Sintered - A powdered metal, oil impregnated staight bearing that is self lubricating, long lasting and impervious to heat and cold. Ball Bearing - A flanged, permanently lubricated bearing, pressed in on each side of the wheel hub.


NSF Certified

All casters shown on meet the required construction standards and are listed under Food Service Equipment Criteria C2 as NSF Approved.



Institutional Caster wheels are offered in a large variety of types, treads, materials and sizes. The type and size of wheels chosen depends on several considerations...

1. The total overall weight of the load

2. The floor surface and conditions

3. Unusual environmental conditions such as moisture, extreme heat or cold

4. Exposure to chemicals, salt, oil, blood, fats etc.

5. Shock loading and other physical impacts

6. Noise


Floor Conditions

The correct diameter of caster wheel is one that is large enough to pass over floor cracks and other similar obstacles. In choosing the correct caster, considerations must be given to the type of floor such as ceramic, tile, vinyl, brick or cement. Surface conditions are affected by grease, detergent, and heat. Autoclave requirements also bear on the choice of the caster.




Polyolefin Wheel



Very economical, solid Polyolefin wheels are also lightweight, hard and easy rolling. Made from durable thermoplastic, these wheels generally require no bearings and are ideal for use in corrosive conditions which can cause continual, costly, bearings replacement. Polyolefin material resists most oils, grease, solvents, acids and other chemicals. Temperature range is -20°F to 180°F (-29°C to 82°C).








Polyurethane Wheel



Polyurethane wheels are manufactured with a precision molded polyurethane tire mechanically locked to a polyolefin core. They are chemical and corrosion resistant. Virtually indestructible, Polyurethane wheels are at the same time, economical and smart in appearance. Temperature range is -30°F to 180°F (-34°C to 82°C).








Wheel Application Guide