idlers

​A high-quality carrying idler is defined by its durability in harsh environments:
​Shell/Tube: Usually made of steel or high-density polyethylene (HDPE).
​Bearings: Often deep-groove ball bearings, which are the "heart" of the idler.
​Seals: Critical for preventing dust, water, and grit from entering the bearing housing (often using Labyrinth seals).
​Shaft: Precision-ground steel to ensure smooth rotation and alignment.