B51 V-Belt; Width: 5/8"; Length: 54"
Understanding the Part Number
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.
51? 51 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 B51 belt is 54 inches (51+3).