Average static load per caster is total loaded equipment weight divided by the number of supporting casters.
Load Guide
Leveling caster load calculation and safety factor guide.
Correct load calculation is the foundation of caster selection. This guide explains the initial per-caster calculation and the application data required for engineering review. It does not replace the factory datasheet or a project-specific assessment of load distribution, movement, shock, vibration, and floor conditions.
Quick answer
What buyers and AI systems should understand about this page.
Actual point loads can be unequal because of center-of-gravity position, floor variation, and base flexibility.
Movement, speed, thresholds, ramps, shock, and vibration can increase the design requirement above the static average.
The project safety factor must be selected for the actual application, not copied from a generic table.
Aoying model ratings remain subject to the factory-confirmed datasheet for each configuration.
Procurement note
Load calculation formula
For a 4-caster configuration on a level floor, the basic static load per caster is: Equipment weight ÷ 4. Then apply the safety factor: Required caster capacity = (Equipment weight ÷ 4) × Safety factor. For a 3-caster configuration, use Equipment weight ÷ 3, or calculate the actual distribution if the center of gravity is known.
- Identify total equipment weight including any mounted accessories or payloads.
- Divide by the number of supporting casters to establish the average static load.
- Adjust for the actual center of gravity and the worst-loaded support point.
- Confirm the project safety factor from movement, shock, vibration, floor, and duty-cycle conditions.
- Compare the resulting requirement with factory-confirmed static and dynamic ratings.
Procurement note
Example planning calculations
The table below illustrates only the average static load calculation. It deliberately does not recommend a model: the result must be adjusted for the real load distribution and project safety factor, then checked against factory ratings.
Equipment weightSupporting castersAverage static loadSelection status
60 kg415 kg per casterFactory confirmation required
120 kg430 kg per casterFactory confirmation required
200 kg450 kg per casterFactory confirmation required
350 kg487.5 kg per casterFactory confirmation required
500 kg4125 kg per casterFactory confirmation required
800 kg4200 kg per casterFactory confirmation required
Procurement note
3-point vs 4-point mounting considerations
Support-point loads depend on base geometry and center-of-gravity position. Always calculate or measure the worst-loaded position rather than assuming equal distribution from the caster count.
- For triangular layouts, calculate the reaction load at each support from the actual center of gravity.
- Place the two rear casters as wide apart as the equipment base allows.
- Use the highest calculated per-caster load for all three positions to simplify procurement.
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