Aetna 41.4mm Pitch 8T 5/8" ID x 7/16" Heavy Duty Double Idler Sprocket

Aetna Bearing Company is an American manufacturer of idler pulleys, idler sprockets, and drive components for conveyor, agricultural, and industrial power transmission applications. Their components are manufactured to precise dimensional tolerances and are available in a wide range of bore sizes, pitches, and flange configurations to suit standard chain and belt drive systems.

Aetna idler sprockets are precision-manufactured chain drive components used to tension, guide, and redirect roller chain in agricultural machinery, conveyors, and industrial drives. Available in both single and double configurations with standard inch bore IDs, they are manufactured to ANSI chain pitch standards and suit standard #40, #50, and related roller chain sizes.

Where this product is used

Idler sprockets are used wherever chain tension and routing must be maintained in a drive system:

• Agricultural machinery including combine headers, augers, and row crop equipment with multi-chain drives.
• Industrial conveyors and material handling equipment where chain slack must be taken up between drive and driven sprockets.
• Packaging machinery and production line equipment requiring precise chain tension for consistent speed and torque transfer.

Selecting the right option

Select by chain pitch (e.g. #40 = 1/2", #50 = 5/8") and the number of teeth required to achieve the correct tension and wrap angle in your drive layout. The bore ID must match your idler shaft or stud diameter — confirm this before ordering. Heavy duty sprockets are recommended for high-load or high-speed chain drives.