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No Springs Attached!

Utilizing an exclusive polymer torsion system, instead of a spring, PolyForce™ Belt Tensioners by Kit Masters are built to last.

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Kit Masters PolyForce belt tensioners

Torsion to the Rescue!

Conventional belt tensioners use springs to hold their position and tension. However, springs can only flex so many times before they fail. PolyForce™ Belt Tensioners replace this spring with a longer lasting, new and unique polymer Torsion system.

A compressed silicone replaces the spring, thereby eliminating the primary cause of failure.


PolyForce belt tensioner

Improved Bearings

The other common failure point in a belt tensioner is the bearing. The pulley bearing absorbs a huge amount of vibration and can often fail too soon. PolyForce™ Belt Tensioners have dramatically improved pulley bearings to give them extended life.

Our bearing is designed specifically for pulley applications and features:
– Outer Ring Rotation
– Anti-Vibration Grease (won’t separate)


PolyForce bearing

Search Belt Tensioners by Application

Find the appropriate replacement for your belt tensioner by using a vehicle’s year, make, model and engine.

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PolyForce Belt Tensioner Modular System

Modularity = Greater Coverage

The PolyForce™ Belt Tensioner modular system allows you to stock a few components while maintaining maximum market coverage.

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Mobile tensioner repair kit

Mobile Tensioner Repair

The PolyForce™ Belt Tensioner mobile kit contains everything you need to identify & assemble a brand new belt tensioner in minutes!

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Download the Catalog

download the PolyForce cross reference guide

Download the PolyForce digital catalog in PDF format to use on the go.

2 year 200,000 mile warranty resetting

2 Year / 200,000 Mile Warranty

All PolyForce™ Belt Tensioners are backed by Kit Masters’ rock-solid 2 year / 200,000 mile warranty. That’s TWICE as long as the competitor’s warranty!