How does the load-bearing capacity of casters affect their selection and use?

The core influence of caster load-bearing capacity on selection and use
The load-bearing capacity of casters is the core benchmark for selection and use. It directly determines whether the caster is suitable for furniture/equipment, whether it can ensure safety, and its service life. Its specific impact can be seen from three aspects: selection logic, safety, and scenario suitability.

During the selection process, load-bearing capacity is the primary screening criterion. First, calculate the "total load" (the weight of the furniture/equipment + the weight of daily loads), then select the model based on the principle of "single-wheel load ≥ total load ÷ number of casters × 1.3 (allowing a 30% safety margin)." For example, for a 20kg mobile desk (with four casters), the load-bearing capacity of each wheel must be ≥ (20 ÷ 4) × 1.3 = 6.5kg. Choosing a 5kg load-bearing caster will cause deformation due to overload. Furthermore, the material must be matched to the load capacity: TPU/plastic wheels are recommended for light loads (≤10kg), PU/rubber wheels are recommended for medium loads (10-30kg), and nylon/stainless steel wheels are essential for heavy loads (≥30kg). This is to avoid breakage caused by insufficient load capacity.

During use, load capacity directly impacts safety and injury risk. If the load capacity is insufficient, casters are prone to "stuck" (bearing failure due to overload), causing furniture to "drag" when moved and scratching the floor (e.g., leaving marks on wooden floors and snagging on carpets). Chronic overloading can also cause wheel cracks, bracket bends, or even sudden breakage, causing furniture to tip over (e.g., a bookshelf filled with books). Conversely, when the load capacity is appropriate, casters roll smoothly and evenly distribute pressure, protecting the floor and preventing equipment from shaking (e.g., operating table casters with sufficient load capacity ensure stability during surgery).

Furthermore, load capacity determines the scope of application scenarios. For lightweight home furniture (such as dressing tables), low-load casters are sufficient and cost-effective. However, heavy commercial equipment (such as operating room instrument carts) requires high-load casters to ensure stability after frequent movement and disinfection. Using low-load casters for commercial heavy-duty applications significantly shortens their lifespan (a caster that originally lasted three years may break down in just one), increasing maintenance costs. In summary, load-bearing capacity is the bottom line for caster selection and use, requiring precise matching to ensure a balanced balance of safety, efficiency, and durability.