Belts & Pulleys

40+ products

Expected delivery: Tue, Nov 17

Belts and pulleys for blowers, air handlers, compressors, conveyors and shop machines. This subcategory covers classical V-belts in A and B sections, light-duty fractional horsepower belts such as 3L, 4L and 5L, narrow section belts such as 3V and 5V, cogged belts, timing belts, and the matching sheaves and pulleys with fixed bores or tapered bushings.

What to check before you order

  • Belt section and length. The part number gives both. An A48 belt, for example, is an A section belt with a 48 in. nominal size. If the marking is worn off, measure the top width and outside length.
  • Light-duty or industrial. 4L and A belts are close in size but built for different duty. Use the type the equipment maker specifies.
  • Matched sets. On drives with more than one belt, replace all belts together so they share the load evenly.
  • Pulley size and bore. Match the number of grooves, the belt section, outside diameter, and bore and keyway. Bushed sheaves need the correct bushing for the shaft.
  • Alignment and tension. Misalignment and wrong tension shorten belt life. Follow the equipment maker's tension specification.

Lock out the equipment before changing belts. Blower motors and couplings are in motors, gears and couplings, bearings are in bearings and bushings, HVAC parts are in fans, heaters and HVAC parts, and more is in power transmission.

Common questions

Why is my V-belt squealing?

A squealing belt is usually slipping from low tension, worn belts or sheave grooves, oil on the belt or misalignment. Lock out the drive, inspect, and reset tension to the maker's specification.

What is a QD or taper-lock bushing?

A split, tapered bushing that clamps a sheave to the shaft, so one sheave can fit several shaft sizes. Bushing and sheave must be the same style and size.

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