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Caster Terminology

Key Measurements

In order to make sure you get the right caster for your application, you will need to know how to measure some key measurements. The diagram below will help you understand how to find these specifications.

This is the distance measured vertically from- one side of the tread to the other.
The distance measured laterally across the tread of the wheel.
The total distance the caster raises the cart off the ground. Measured vertically from the top of the fastener to the tread of the wheel.
The distance from the center of the Kingpin to the tread of the wheel.


To determine the Load Capacity per caster, you must first find out the weight of the cart plus the load it caries. Once you know the total maximum weight, divide that number by the total number of casters on the cart to get the Load Capacity per caster. (This applies to manually pushed carts only.)
For example:

Cart weight (100lbs) + Maximum Load (900 lbs) = Total weight (1000 lbs)

Number of Casters on cart = 4

1000 lbs 4 casters = 250lbs per caster

If you have an application where the cart is moved mechanically (i.e. Tow Lines, Forklifts, Tug Cars,) you should use a caster that does NOT have a Kingpin in the Raceway. This is because the Shock Loading of casters in these applications can exceed the maximum capacity and cause premature Kingpin failure, injury, or death. Kingpin Free casters, such as our 9000 series shown in the example, are designed to take the high shock loads in mechanical applications.

If you can only use a kingpin style caster on these types of carts then you should only calculate half the number of casters in the formula for added safety.
For example:

1000lbs 2 casters = 500lbs per caster

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