For drive applications with a speed change requirement, Jason offers standard American variable speed belts in widths from 3/4-inch through 3 7/8-inches. Pitch lengths are available in lengths from 21.5 inches to 169 inches. These include all of the recommended RMA sections, plus many more covering a broad range of applications.
These belts conform to RMA Engineering Standard IP-25.
The standard RMA numbering system specifies the belt width in sixteenths of an inch, the pulley V-groove angle in degrees and the belt pitch length in tenths of an inch.