A, B, C, D and E V Belts

Classical V-Belts – A, B, C, D, E Series (Cogged & Banded) | Specifications & Applications

When it comes to industrial power transmission, Classical V-belts remain a cornerstone for reliability, versatility, and performance. Available in standard profiles – A, B, C, D, and E – these V-belts are engineered to handle a wide range of horsepower ratings, pulley configurations, and environmental demands.

Overview of Classical V-Belts (A–E Series)

Classical V-belts are trapezoidal in cross-section and are measured by their top width and height. They are designed to transmit torque from electric motors or internal combustion engines to pulleys, allowing for efficient motion transfer in mechanical systems.

Specifications:

Cogged (Notched) V-Belts

Cogged or notched V-belts (e.g., AX, BX, CX types) have precision-cut cogs on the inner surface. These notches improve belt flexibility, reduce bending resistance, and enhance heat dissipation—ideal for small pulley diameters or high-speed applications. Cogged belts deliver higher efficiency and longer life in demanding environments.

Banded V-Belts

Banded V-belts (e.g., 3/A, 2/B) consist of multiple V-belts joined by a common backing. This design prevents belt twisting, slipping, or jumping in multi-groove pulley systems. Banded belts are essential for high-shock load applications and large industrial machinery where stability and synchronization are critical.

Applications of Classical V-Belts

Classical A through E series V-belts are used in a broad range of industries and machines, including:

• HVAC systems and air compressors

• Industrial conveyors and processing equipment

• Agricultural machinery (tractors, combines)

• Mining and construction equipment

• Milling, grinding, and woodworking machines

• Automotive and heavy-duty vehicles

• Marine and off-road machinery

Their robust construction makes them suitable for moderate to high horsepower applications, with options tailored to light-duty or high-impact scenarios.

4L and 5L Series Belts vs A and B Series Belts

A common question is the difference between fractional horsepower (FHP) belts like 4L and 5L and classical belts like A and B series. Here's the relationship:

4L Series vs A Series:

• Both have a top width of 1/2 inch, but 4L belts are specifically designed for fractional horsepower (FHP) motors (typically under 1 HP).

• 4L belts are lighter, more flexible, and optimized for smaller pulley diameters and light-duty applications.

• A series belts are heavier-duty and suitable for higher horsepower and industrial loads.

• Interchangeability: In some systems, 4L and A belts can be interchanged if dimensions and power requirements align, but always verify the application requirements.

5L Series vs B Series:

• Both have a top width of 21/32 inch, but the 5L series is again meant for fractional horsepower/light-duty use.

• 5L belts are commonly found in residential HVAC systems, small pumps, and fans.

• B series belts, by contrast, are used in heavier, high-torque environments.

• Interchangeability: Similar to 4L/A, some 5L and B belts are dimensionally close, but application load ratings must be considered.

Conclusion

Whether you're running a high-horsepower industrial drive or a light-duty HVAC system, the right V-belt makes all the difference. Classical A, B, C, D, and E series V-belts, including cogged and banded variants, provide a full range of options for virtually any power transmission challenge. And by understanding the relationship between FHP belts (4L, 5L) and their classical counterparts (A, B), you can make informed decisions for performance, compatibility, and cost-effectiveness.