Pulleys and Tensioners
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Fenner Drives Image

Fenner Drives Pulleys and Tensioners

Fenner Drives pulleys and sprockets offer superior composite design for years of successful service. They are engineered for use on conveyors, packaging equipment, lawn and garden equipment, HVAC units, fitness equipment, floor cleaning machines, and in many other power transmission applications.

Fenner is the industry leader in standard and custom molded composite solutions for industrial power transmission and material handling applications.

Industries and Applications


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  • select_check_box Automotive

Fenner Drives Pulleys and Idlers

Features and Benefits

  • Molded of high-strength, glass-reinforced nylon for heat and abrasion resistance
  • Corrosion-resistant design perfected for washdown applications
  • Stainless steel bearings available in multiple sizes for severe applications
  • Precision sealed bearings are greased for life — never need relubrication
Flat Round Idlers Image

V-Belt, Flat Belt, and Round Belt Idlers

Fenner Drives V-Belt Idlers are design to deliver strength and durability for standard A, B, and 5V section V-belts in a variety of industrial applications. Radial supporting ribs provide additional belt support and prevents groove deformation. Also available as a single flange idler.

Flat Belt Idlers are available for a wide range of standard belt sizes; also suitable for use as back side idlers on V-belts. The molded-in crown helps center the belt and prevent rubbing against flanges.

Round Belt Idlers are designed for use with round belts, ropes, or cables. The deep uninterrupted groove provides continuous support and eliminates any binding or wedging problems found with steel or cast iron pulleys. Small series pulleys are ideal for tight-fit applications

Custom Solutions to Fit Your Needs

Explore a range of engineered composite materials to find the best fit for your application requirements. Our engineers evaluate how you use your equipment to design a custom solution that reduces pieces, saves weight, and increases your operating efficiency.
Mounting Adapters Image

Mounting Adapters

Versatile mounting adapters simplify the job of assembly and help reduce overall cost. Made of high-quality sintered iron materials, they are press-fitted in place at the factory so that you only need to handle one component — the “finished” belt idler assembly.

Fenner Drives Tensioners

Without the right maintenance, V-belts and roller chains elongate significantly over time in power transmission drives. Incorrect belt or chain tension leads to increased downtime, lower equipment productivity, and inflated maintenance costs. But manual re-tensioning can be a costly, time-consuming process. Fenner Drives automatic tensioners eliminate the need for regular manual retensioning of drives. Fenner Drives tensioners also ensures you don’t inadvertently over-tension drive components, enhancing your overall drive operating efficiency.

Combined with a Fenner Drives idler pulley or chain sprocket from Fenner Drives, an automatic Fenner Drives tensioner can be used to:

  • Extend the life of critical drive components
  • Reduce system downtime
  • Increase drive efficiency
  • Reduce belt and chain whip on long center drives
  • Ensure drive components do not snag obstructions
  • Reduce resonant frequency of chain drives


Features and Benefits

  • Reduced machine downtime and increased drive efficiency through correct tension
  • Constructed from high-quality materials for proven durability
  • Wide range of tensioners to handle single and multiple strand belt and chain drives
  • Available in linear and rotary (light-duty, medium, and heavy-duty) series
  • A range of sizes and mounting styles available to best fit your application
Light Duty Rotary Tensioners Image

Light-Duty Rotary Tensioners

Light-duty rotary tensioners allow for easy installation and adjustment with a single bolt feature and come in a variety of sizes and mounting styles. Fenner Drives light-duty rotary tensioners improve performance and extend life for most fixed-center drives. The built-in spring mechanism absorbs momentary overloads and reduces vibration. The RT1000 and RT1600 series are best suited for single groove V-belt drives using 3L, SPZ, A/13 (4L), or B/17 (5L) belts.

Pulley and Tensioner Literature

If you’re interested in finding out more about our pulley and tensioner solutions, browse and download product brochures for details on our full range of offerings.

View all Pulley and Tensioner Literature
View all Pulley and Tensioner Literature

Fenner Industrial Motion Product Catalog

Browse the Online Product Catalog and Download CAD Models

Browse the Catalog

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