• Lightweight levers in high-tensile light alloy. 
• Pulleys in zinc plated steel, aluminum or nylon. 
• Sprockets in steel or hardened steel.
• Pulleys and sprockets have double-seal permanently oiled ball bearings. 
• Sliding head's orientation is adjustable, and it is made of low-friction, wear-resistant polyethylene (dynamic friction coefficient of 0.06 on dry steel) with maximum operating temperature of 65°C (149°F).

These lightweight tensioners take up the chain or belt slack, and keep the tension constant without the operator making any adjustments over a range of approximately 30° of motion.

In a typical application, the following benefits were achieved*:

• 23% increase of chain life. 
• 7% reduction of vibrations. 
• 12% reduction of noise. 
• Reduction in chain slackening.
• Elimination of the need for maintenance.

* The actual values will vary depending on the operating environment, type of lubricant and the conditions of the machine.