Can Your Caster Wheels Survive Uneven Floors?

Why Smooth-Floor Testing Is Not Enough

Actual floor conditions vary from one customer to another. Industrial caster wheels may need to cross expansion joints, door thresholds, floor gaps, metal tracks, debris, or other raised sections during daily operation.

Each impact transfers a sudden load through the tread, wheel center, axle, bearing, fork, swivel assembly, and mounting plate. After repeated impacts, a weak caster may develop tread cracks, delamination, abnormal wear, bearing looseness, bracket deformation, or difficult swiveling.

Obstacle testing evaluates the entire caster system under repeated impact—not only whether the wheel can roll on a flat surface.

GB/T 14687-2011 Test Conditions

GB/T 14687-2011, Industrial Castors and Wheels, defines test conditions for non-powered industrial castors and wheels used on industrial vehicles and equipment.

Obstacle Height Depends on Tread Hardness

The obstacle height h is calculated as a percentage of wheel diameter D. Soft and hard wheels use different percentages because their deformation and shock-absorption behavior are different.

Soft treads can deform and absorb part of the impact. Hard wheels deform less, so impact is transmitted more directly into the wheel and caster structure.

How the Obstacles Are Arranged

The alternating 45-degree layout exposes the caster to impacts from both sides, while the spacing rule prevents the same section of tread from hitting every obstacle.

What Determines the Test Result?

Obstacle resistance is affected by more than the tread material. Wheel diameter, tread width and resilience, wheel-center structure, axle diameter, bearing type, fork thickness, swivel design, load, speed, and obstacle height all influence the result.

Larger wheels generally cross obstacles more easily. Resilient treads can absorb impact and reduce noise, while harder wheels often provide lower rolling resistance but transmit more shock into the structure.

For this reason, rated load alone cannot show how a caster will perform on an uneven floor. The complete design and the actual test conditions must be considered together.

A Customer Test More Demanding Than Usual

Most EDL industrial casters are tested according to the relevant GB/T 14687-2011 conditions. However, European standards, American standards, industry specifications, and individual manufacturers may use different speeds, loads, obstacle profiles, or crossing counts.

One customer once specified an obstacle considerably higher than the level used in our normal testing. At first, we expected that such a severe impact could cause the sample to fail.

We reviewed the customer’s drawing and test requirements, then confirmed the wheel diameter, tread material, wheel-center structure, bracket strength, and mounting dimensions before producing the sample.

The finished sample successfully passed the customer’s demanding obstacle test. The result showed that caster performance cannot be judged from catalogue load capacity alone—a well-matched wheel and bracket structure can make a decisive difference under repeated impact.

When a customer provides a different test method, EDL can evaluate the requirements, build the sample accordingly, and verify performance under the specified conditions.

Information Needed for Uneven-Floor Applications

Test for the Floor the Caster Will Actually Face

Obstacle testing is an important way to evaluate the impact resistance and long-term reliability of industrial caster wheels. It reproduces the joints, raised sections, and uneven surfaces that cannot be represented by a smooth running test alone.

EDL can test according to relevant GB/T 14687-2011 conditions or evaluate other national, industry, and customer-specific methods.

For unusual obstacles or demanding operating conditions, sample testing provides stronger evidence than specifications alone.