Dayco's Automatic Belt Tensioner features a patented "flat spring" design that's engineered to provide less operating range variations in tension. This reduces the risk of premature accessory bearing failure due to high tension when a new belt is installed. It also lessens the risk of belt squeal and slippage, or poor accessory performance caused by low tension after the belt begins to stretch and wear. A Teflon strip wound within the spring resists abrasion. The flat spring itself is coated to resist rust.

Product Features:

• Heavy-duty cast aluminum spring case resists cracking and fatigue
• Steel locator pin and pivot tube (where the application demands)
• Heavy-duty cast aluminum arm offers additional strength and less distortion
• Thermoplastic rubber "spring slot plug" keeps out harmful contaminants
• Zinc coated mounting bolt (where included) resists rust, and is concentric for a more even degree of constant tension