An idler pulley typically appears as a smooth, circular disk or small wheel crafted from stamped steel, cast aluminum, or heavy-duty thermoplastic composite material. It features a central mounting bore hole fitted with a sealed ball bearing assembly designed to bolt securely onto an engine block or machinery frame. Depending on its specific application, the outer perimeter of the idler pulley can be completely flat and smooth for contacting the back flat side of a serpentine belt, or it can feature precision-machined V-grooves designed to align with multi-ribbed accessory drive belts. They are generally compact, measuring between two and six inches in diameter.
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