When selecting a caster, several factors should be considered: load requirements, wheel hardness and mounting method, as well as any special application requirements.
Guidelines for Selecting the Right Wheel Caster
In order to determine the load capacity for each caster, you must divide the combined weight and maximum load of the equipment by the number of casters to be used.
(Equip Weight + Max Load Weight) / # of Casters = Approx. Load Capacity
Example: unit weight is 100 lbs and max load is 500 lbs. The number of casters that will be used is 4.
So the formula is: (100 + 500)/4 = 150 lbs load capacity.
Caster wheels are made from many different materials: steel, iron, nylon, rubber or plastic. Each material has its own strengths and your selection should be based on the application.
Hard Caster Wheels have a greater load rating because they do not compress easily or flatten over time. This means they work well for equipment that is not moved often. They work well in carpeted areas and hold up to outdoor environments. Soft Caster Wheels are much quieter than a harder wheel so are best in situations where a quiet operation is necessary. They handle light to medium loads and work well for hard or uneven surfaces. Soft wheels will flatten over time so should only be used on equipment that is frequently moved.
We offer three type of mounting methods:
Stem casters have a rod that may or may not be threaded. Threaded studs may be screwed into a t-nut while unthreaded studs are inserted into a pilot hole or caster socket and have a ring or grip neck to hold it in place.
Bolt-hole casters have a hole that allows a bolt to be run through it and secure the caster into place with a nut.
Plate casters have a mounting plate that allows the caster to be bolted or screwed into place.
Range of Motion
Casters are designed to have different ranges of motion. Rigid casters can only move backward or forward. Swivel casters can rotate 360°, rolling in any direction.