B – The B stands for a “B” section v-belt. This is considered a “Classic” v-belt style that has a top width of 21/32 (0.656) inches, but is commonly referred to as a 5/8 (0.625) inch belt. The thickness of the belt is 13/32 (0.406) inches.
29– 29 inches is the inside circumference of the belt. For B-section v-belts, the outside circumference is found by adding 3 inches to the inside length of the belt. So, the outside circumference of the B29 belt is 32 inches (29+3).
Length (inch)32Length (mm)813Length TypeOutside Circumference
Top Belt Width per strand (inch)0.66Top Belt Width per strand (mm)17Nominal Thickness (inch)0.41Nominal Thickness (mm)10