How To Measure A Belt Pulley. A (1/2) b (21/32) c (7/8) d (1 1/4) e (1 1/2) measuring belt length with an old v belt place a mark on the side of an old v belt with a white paint marker. A metal pulley and rope.
A section= add 2 to belt number (example a88 = 90 outside circumference) b section= add 3 to belt number (example b88 = 91 outside circumference) c section= add 4 to belt number (example c88 = 92 outside circumference) Also known as belt width, this measurement is only required for pulleys with flanges.
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Also known as od, length, breadth. Begin by holding your pulley vertically to expose the flat side, and measure from outside edge to outside edge with a ruler.