Part Numbers Explained

Part numbers can be difficult to understand unless you work with belts all the time. Fortunately, we do. And we’re here to support you.

Please refer to chart below to better understand part numbers if you’re having trouble figuring out what you need.

How to Measure for the Right Belt Size

Knowing the correct length of belt you need is not only necessary in order to fit it to your equipment, but will dramatically improve the performance of that machinery.

Belts cannot be accurately measured by folding the belt in half. Instead, match a length of string to the circumference of your belt, and measure using a standard tape measure. Take care not to bend the metal tape or you could get an inaccurate measurement.

Belts have both an inside and outside circumference measurement.

SectionInner CircumferenceOuter Circumference
A 88" 90"
B 88" 91"
C 88" 92"
D 105" 110"
E 144" 150"
AX(eg. Ax60)  60" 62"
BX(eg. Bx50)  50" 53"

You will also need to measure how wide the belt is. With this basic information, you are ready to consider the other key factors in determining what kind of belt you need:

A 0.5” wide
B 5/8” wide
C 7/8” wide
D 1 and 1/4“ wide
E 1 and 1/8” wide
AX 1/2” wide
BX 5/8” wide

Directbelt on Youtube

We hope that these videos address many of the frequently asked questions that we receive on a regular basis. If you’d like to see a video on something not shown, let us know! We want to be there to help you every step of the way.