Transmission Belts

Transmission belts transfer rotational power between pulleys, letting a motor drive one or more shafts without a direct gear or chain connection. The category covers several distinct designs, including V-belts, which use a trapezoidal cross-section to wedge into a pulley groove for strong grip, and synchronous belts, which use teeth to maintain precise timing between pulleys without slip. Specialized styles like double-sided V-belts add power transmission capability from both sides of the belt for multi-pulley drives, while variable-speed V-belts allow the drive ratio to change as the pulley width adjusts. Choosing the right power transmission belt comes down to matching profile, length, and material to the equipment’s speed, load, and alignment requirements. 3BG Supply Co. stocks transmission belts across all these profiles, including our variable-speed V-belts for equipment requiring adjustable output speed.

Find the right Transmission Belts for your needs.

  • Brand
  • Type
  • Belt Width Inch
  • Belt Width MM
  • Timing Belt Pitch Inch
  • Timing Belt Pitch MM
  • Outside Belt Diameter Inch
  • Outside Belt Diameter MM
  • Number of Ribs
  • Number of Teeth
  • Material
  • Dual-Sided
  • Accessory
  • Category
  • Price

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    Why Choose 3BG Supply for Your Sprocket Needs?

    At 3BG Supply Co., we go beyond just providing parts—we deliver solutions. Our extensive inventory of industrial sprockets, expert guidance, and fast shipping ensure you get the right product for your application. Whether you need roller chain sprockets, split sprockets, or custom-designed options, we’re here to help.

    FAQs

    What's the difference between a V-belt and a synchronous belt?

    A V-belt has a trapezoidal cross-section that wedges into a matching pulley groove, relying on friction to transmit power, which allows for some slip under heavy load. A synchronous belt uses teeth that mesh with a toothed pulley, eliminating slip and maintaining precise timing — a common requirement in applications like camshaft drives or indexing equipment.

    What are double-sided V-belts used for?

    Double-sided V-belts (also called hex belts or double-angle belts) transmit power from both faces of the belt, allowing a single belt to drive multiple pulleys in a multidirectional layout. They're common in agricultural, lawn and garden, and manufacturing equipment where compact multi-pulley drives are needed.

    How do variable-speed V-belts work?

    Variable-speed V-belts run on pulleys with adjustable-width sheaves, so as the pulley halves move closer together or farther apart, the belt rides at a different effective diameter, changing the output speed. This lets equipment like band saws and milling machines adjust speed without swapping pulleys.

    How do I choose the right power transmission belt for my equipment?

    Matching belt profile — V-belt, synchronous, double-sided, or variable-speed — to your drive's speed, torque, and alignment requirements is the starting point, followed by confirming belt length and width against your specific pulley setup. Environmental factors like heat, oil exposure, and dust resistance also affect material selection.

    How often should transmission belts be replaced?

    Most transmission belts should be inspected for cracking, glazing, or fraying at regular maintenance intervals, with replacement typically recommended every one to three years depending on duty cycle and environment. Belts under variable tension or heavy shock loads generally need more frequent inspection.

    Industrial Transmission Belts Manufacturers