Provide long life under demanding conditions. They are installed with standard 12 or 58 bolts. Applications include agricultural, power transmission equipment, and conveyor systems. Aetna belt idlers are generally used as tensioners or direction changers. Permanently lubricated and sealed against grime and dirt. Fit into existing designs with little or no engineering changes, or are readily adapted to new designs. ADVANTAGES Over-size, factory packed lubricant chamber assures maximum life and operating efficiency without troublesome relubricationCase hardened to resist belt abrasionAvailable for most common belt sizesBearing races are hardened to resist wear, outers and inners are accurately formed for smooth runningAetna's self-contouring, free-running, self-wiping seal provides positive contact under all conditions of misalignmentFull ball complement for high durability