Metal Window and Door Roller Sliding Pulley for Shower Room

Here's an English overview of the key structural components of a typical metal door/window single roller (also known as a single roller wheel or sheave):

1. Roller Wheel: The core rotating component, usually made of durable material like nylon, polyamide (PA), or sometimes steel with a rubber tread. This is the part that directly rolls within the track.

2. Wheel Axle/Bearing Pin: A hardened steel pin running through the center of the roller wheel. It provides the axis for the wheel to rotate.

3. Bearings: Located between the roller wheel and the axle/bearing pin. Common types are:

   • Ball Bearings: Small steel balls held in a race, providing smooth, low-friction rotation. Most common in quality rollers.

   • Bushings/Sleeve Bearings: Simple cylindrical sleeves (often bronze, sintered bronze, or polymer) that the wheel rotates around the pin on, usually with grease lubrication. Simpler and potentially less smooth than ball bearings.

4. Bracket/Housing/Mounting Frame: The structural metal component that holds the wheel assembly. It typically features:

   • Mounting Holes: For attaching the roller securely to the bottom corner of the door or window leaf (sash) using screws or bolts.

   • Axle Support Points: Where the wheel axle/bearing pin is fixed or pressed into place.

5. Anti-Derailment Lip/Flange (Optional but common): A raised edge or lip on one or both sides of the bracket/housing. This lip fits under the edge of the track, helping to prevent the roller from accidentally jumping out (derailing) if the door/window is lifted or subjected to lateral force.

6. Height Adjustment Mechanism (Optional but common): Found in many modern rollers, especially for doors. This allows fine-tuning the roller's height relative to the bracket, enabling the installer to level the door or window and ensure smooth operation within the track. It often involves a threaded screw or eccentric cam acting on the wheel axle.

7. Lubrication (Internal): High-quality rollers often have factory-applied lubricant (grease) sealed within the bearing area to ensure smooth, long-lasting operation.

Typical Material Combinations:

• Bracket/Housing: Steel (often galvanized, zinc-plated, or stainless steel - e.g., 304/316 for corrosion resistance), Zinc Alloy (Zamak).

• Roller Wheel: Nylon, Polyamide (PA), POM (Acetal/Delrin), Rubber-coated Steel.

• Axle/Bearing Pin: Hardened Steel, Stainless Steel.

• Bearings: Steel balls/chrome steel (ball bearings), Bronze, Polymer (bushings).