Galvanized Iron Pulley

The Galvanized Iron Pulley occupies a specific niche in the market, defined almost exclusively by its decisive cost advantage. This pulley is manufactured from stamped or cast iron, which is then coated with a layer of zinc (galvanized) to provide a basic defense against immediate rusting. Its primary reason for existing is to enable the production of sliding screen products at the very lowest possible price point, making basic insect screening accessible for ultra-tight budgets or situations deemed temporary.

It is crucial, however, to understand the inherent limitations that accompany this low cost. The galvanized iron pulley has a fundamentally shorter service life. The zinc coating is thin and can wear off through friction against the aluminum track. Once the underlying iron is exposed, it will rapidly oxidize and rust. This rust creates rough, uneven surfaces that cause the pulley to stick, jam, and produce grinding noises. The rust residue can also stain and damage the track itself. Furthermore, the iron is not as wear-resistant as nylon, leading to faster mechanical degradation. While functional initially, the Galvanized Iron Pulley often represents a higher long-term cost due to the need for earlier replacement of the entire screen unit.