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A shock load is a sudden, brief spike in force — like a caster dropping off a dock plate edge or a cart getting jolted — as opposed to the steady, continuous weight a standard load rating assumes.
Shock loading can exceed a caster’s rated capacity for a fraction of a second, and repeated shock is exactly what wears out standard kingpin construction fastest — it’s the main reason kingpinless casters and spring-loaded (shock-absorbing) casters exist.
Dock and tow-line equipment, anything crossing thresholds or gaps regularly, and rough or uneven floor environments.
Sizing only to steady load capacity in a shock-heavy environment. If the application involves regular jolts or impacts, factor in kingpinless construction or a spring-loaded caster rather than relying on standard capacity margin alone.
How do I protect against shock loads?
Kingpinless construction and spring-loaded (shock-absorbing) casters are both built specifically to handle repeated shock better than standard kingpin casters.
Does a higher capacity rating protect against shock?
Not directly — capacity rating reflects steady load, not impact resistance. Construction type matters more for shock tolerance.
