How to Read a V-Belt Size
- 1). Read the outside surface of the belt for the prefix 4L or 3L.
- 2). Read the three-digit number after the prefix to identify the belt's length. For example, if the belt reads 4L460, you know the belt is 12.5mm wide, with a 46-inch outside circumference.
- 3). Subtract 2 inches for 4L belts or 1 1/2 inches for 3L belts to determine the inside circumference of the belt. Using the same example, the 4L460 V-belt has an inside circumference of 44 inches.