Metal Sliding Window and Door Roller with Double Green Nylon Wheels

Typical Load-Bearing Range for Double-Wheeled Door/Window Rollers:

The load-bearing capacity (weight capacity) of double-wheeled rollers used in sliding doors and windows varies significantly depending on design, materials, and manufacturer specifications. However, a common range is:

• Per Roller (Single Unit): Approximately 20 kg to 50 kg (44 lbs to 110 lbs).

• Per Set (For a Single Door/Window Panel): Approximately 80 kg to 120 kg (176 lbs to 265 lbs) for standard residential applications. Heavy-duty systems can reach 150 kg to 300+ kg (330 lbs to 660+ lbs).

Key Factors Influencing Capacity:

1. Roller Material & Design:

   • Nylon/POM Plastic Wheels: Common for lighter residential windows and interior doors. Lower capacity (often towards the lower end of the range).

   • Steel Wheels: Used for heavier doors (e.g., patio doors, large windows, heavier interior doors). Higher capacity (middle to upper end).

   • Stainless Steel Wheels/Bearings: Offer high capacity and corrosion resistance, common in heavy-duty or exterior applications (upper end and beyond).

   • Bearing Type: Sealed ball bearings significantly increase smoothness and load capacity compared to simple bushings.

   • Wheel Diameter & Width: Larger, wider wheels generally distribute weight better and have higher capacities.

2. Track Design & Material: The roller must be compatible with the track. A robust, rigid track (e.g., thick aluminum or steel) is essential to support the intended load without deforming. Track profile also affects stability.

3. Number of Rollers: Most standard sliding doors/windows use 2 sets of double rollers (total 4 wheels) per moving panel. The total capacity is the sum of the capacities of the individual rollers. Heavy or very large panels may use 3 or more sets.

4. Weight Distribution: Even weight distribution across the rollers is crucial. An unbalanced load can overload individual rollers even if the total weight is within the combined capacity.

5. Application & Frequency of Use: Heavy-duty rollers designed for high-traffic commercial doors or very large/heavy panels will have higher specified capacities than standard residential rollers.