Here are some key characteristics and considerations for a 12mm flat UPVC sliding window roller:

• Roller Type: It’s a single or double roller (often called a tandem roller) with a flat wheel design. The flat wheel is designed to run on a corresponding flat track within the window frame.

• Dimensions: The most important dimension is the wheel’s width, which in this case is 12mm. Other dimensions like the overall length, height, and width of the housing (the bracket that holds the wheel) are also critical for compatibility.

• Materials: Rollers are typically made from a combination of materials.

  • Wheel: The wheel is often made of nylon, which provides quiet operation, or stainless steel for greater strength and durability.

  • Housing/Frame: The bracket that holds the wheel can be made from various materials, including mild steel, stainless steel (SS430 or SS304), or zinc alloy.

• Load Capacity: The weight a roller can support is a crucial factor. Manufacturers will list the load capacity, often in kilograms per pair, which you should match to the weight of your window sash.

• Mounting: These rollers are typically mounted at the bottom of the window sash.

• Adjustability: Some rollers are adjustable, meaning you can change their height to ensure the window is properly aligned and glides effortlessly. This is an important feature for getting a perfect fit and smooth operation.