A?? The A stands for an ?A? section v-belt.? This is considered a ?Classic? v-belt style that has a top width of ? (0.5) inches and a thickness of 5/16 (0.312) inches.
91? 91 inches is the inside circumference of the belt.? For A-section v-belts, the outside circumference is found by adding 2 inches to the inside length of the belt.? So, the outside circumference of the A91 belt is 93 inches (91+2).
Length TypeOutside Circumference
Top Belt Width per strand (inch)0.5
Top Belt Width per strand (mm)13
Nominal Thickness (inch)0.31
Nominal Thickness (mm)8