V Belt

Understanding V Belt Types: Choosing the Best V Belt for Your Needs

Attempting to replace something without precise knowledge of the required models for purchase can be an ongoing frustration. This holds particularly true when dealing with flexible belts in transmission systems, where the specific need for an Industrial V belt drive arises.  

What is a V belt?   

A V-belt is an efficient power transmission device that transfers power between two shafts. It possesses a distinct trapezoidal shape that securely fits into the grooves of a sheave. This unique design enables V-belts to engage with the sheave grooves, providing increased surface contact and enhanced stability.  

When tension is applied to the belt, vertical forces act perpendicularly to the top surface of the v belt drive, pressing its walls against the grooves of the sheave. As these forces intensify, the belt wedges tightly into the sheave grooves, enhancing friction between the belt and the sheave walls. This progressive engagement allows for higher torque transmission while minimizing power loss through slippage.  

The multiple frictional forces present in a V-belt drive enable it to handle heavier loads. The performance of a V-belt offered by V-belt manufacturers in India is determined by the degree of tightness with which it fits into the sheave groove when subjected to increased tension.  

Types of V-Belts  

A V belt manufacturer in India offers three main types of V-belts: classical, fractional horsepower, and narrow wedge. Each type is distinguished by its specific belt code, which indicates the thickness and length of the belt. Understanding the differences between these types and selecting the appropriate V-Belt manufacturer is crucial for optimal performance.  

Classical V-Belts  

The classical V-Belt offered by V belt suppliers is the most commonly used type and is highly durable, making it suitable for older or less efficient machinery. These belts can handle a wide range of loads, ranging from less than one horsepower up to 500 horsepower. They are the only belts operational at fractional horsepower rates and above. The size and shape of the classical V-Belt are defined by a code, with letters A-E representing cross-sectional measurements and the required belt size in inches.   

Fractional Horsepower (FHP) V-Belts  

Designed for light loads and slower transmissions, fractional horsepower (FHP) V-Belts are limited to operating at horsepower levels below one. They are commonly found in appliances such as washing machines or fans. It’s important to note that FHP belts should never be used in heavy-duty machinery, as they are not designed to withstand stress and may snap, causing damage to the system. Unlike classical V-belts, FHP belts use size prefixes ranging from 3V to 8V.  

Narrow Wedge V-Belts  

Narrow wedge V-belts feature a slightly different shape with a larger height-to-width ratio and a more defined “V” shape. These belts are designed to handle higher speeds and heavier loads compared to classical and fractional horsepower V-belts. They can transmit power ranging from 1 horsepower up to 1000 horsepower.   

Understanding the characteristics and applications of each type of V-belt is essential for selecting the appropriate belt for specific machinery and ensuring optimal performance and longevity.  

How to Identify the Ideal V-Belt?  

Having understood the importance and functions of V-Belts, it is essential to know how to accurately identify the appropriate V-Belt for your rotary power transmission when the belt is broken or lacks labeling.  

Determine the Cross-section  

V-belts can be identified by their top width and depth dimensions. For instance, a V-Belt with a top width of 12.7mm and a height of 10mm is categorized as an “SPA” belt. Alternatively, you can utilize V-belt and Ribbed belt sheave measurement tools to quickly identify the correct profile or diagnose power transmission drive wear issues.  

Identify if the V-Belt is Wrapped or Notched  

V-Belts come in two variations: smooth and notched surfaces. Unlike timing belts with teeth or chains with cogs, the notches on V-belts enhance traction. Identifying whether a belt has notches affects the code used to identify the new belt. A notched belt will have an additional ‘X’ in the identifier code. For example, the prefix will change to CX if you require a V-belt of size C with notches.  

Determine the Length of the V-Belt  

To measure the inner length of V-Belts, timing belts, and ribbed v belt drive, you can employ tools like the Opti belt Measuring Gauge. This measuring gauge offers a measurement range of 500-3550 mm (Li) for inside length.  

Following these steps, you can accurately identify the correct V-belt for your specific application, ensuring optimal performance and efficient power transmission.  


In conclusion, V-belts offered by reputed V belt manufacturers in India are flexible machine elements that play a crucial role in power transmission between grooved pulleys or sheaves. They are characterized by their trapezoidal cross-section, which enables them to wedge securely into the pulley grooves.  

The key advantage of V-Belts lies in their ability to maximize surface friction, reducing slip and power loss during operation. This is particularly beneficial for efficient power transmission.  

Understanding the different types and characteristics of V-belts is essential for selecting the appropriate belt for specific applications, ensuring efficient power transmission and optimal performance in various industries and machinery.  

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