How To Measure V-Belt Pulleys | Identifying V-Belt PulleysOne of the ever-growing and most widely used product types n the Power Transmission and the automotive industry is the V-Belt Pulley, also known as a sheave. Measuring a v-belt pulley is simple, however, when it comes to properly identify a v-belt pulley there is a multitude of different styles and options. We standardly stock over 8,000 SKUs of different v-belt pulleys alone!
How To Measure A V-Belt Pulley
Please Note: For the below illustrations we use a standard single-groove v-belt pulley.
The first thing you want to do is measure the outside diameter (O.D) of the pulley.
Next, we'll measure the pitch diameter (P.D), this is the measurement that represents the diameter of the belt it's self as it rides in the pulley. This step is not necessary if you already know your v-belt size or if the pulley and belt are greatly worn.
Next measure the wall thickness of the pulley.
Measure the overall width of the "belt housing" where the belt actually rides in the pulley.
If the pulley has a hub extending past the "belt housing" width it is typically a best practice to measure the extension of the hub.
The final measurement is the complete overall width of the pulley. This will in most cases designate the belt-type or series used.
How To Identify a V-Belt PulleyThe easiest way to identify a v-belt pulley is by finding the part number or identification components on the pulley its self. Different brands, as well as different pulley types, have different ways that they may display these numbers.
Probably the most common style for medium and smaller pulleys is the number is stamped into the pulley prior to it being painted or phosphated. This can make it hard to identify the numbers and letters in most circumstances.
Another style is where the part number is in the casting its self.
Another style is where different identification characters are placed on different spokes.
5-5V= 5-groove, 5V belt size
E= Bushing used
Catalog Part#: 55V1870E
On some pulleys, the part number is actually painted onto it. The problem with this is that over time it can be rubbed off thus making it more difficult to identify the pulley.
If your part number is not distinguishable follow steps 1-6 above to measure the pulley. Then distinguish what style of pulley you have based off of the below photos.
Note: If you have a fixed bore pulley please advise of the bore inside diameter.
Lastly we'll need to know how many grooves are in your pulley, this plus the overall width will confirm the belt type you are using.