SINGLE GROOVE PULLEY Brand new. Single groove, cast iron pulley with keyway and one set-screw. For use with type "A" and "B" belts. Fully balanced.
Outside Diameter 2.45"
Belt Type A (1/2") Datum Diameter 1.80"
Belt Type B (5/8") Datum Diameter 2.20"
Shpg. 1 lb.
Outside Diameter Diameter measured at the outside of the pulley.
Datum Diameter The datum diameters are an industry standard reference point used for calculations such as center distance and belt length. The datum system replaces the pitch system for classical belts and pulleys to compensate for differences in manufacturers construction of belts.
i ordered this pulley for a Belt Type A (1/2") but i received it for Belt Type B (5/8").. can i buy the one i need?
A: These pulleys are cut to accomodate both A and B belts. A belts ride deeper in the groove, so the O.D. on the back side of the belt will be less than the actual pulley measurement. The datum diameter as stated is measured slightly inside the belt, where the torque is actually transferred. To find the O.D. on the back of an A belt, add .375" to the datum diameter.