In Reply to: Re: FAN BELT CROSS REFERENCE -GATES posted by Randy(PA) on July 16, 2018 at 23:33:17:
Thanks, Randy. Yes, I have two NOS 8620-A belts and that is what I measure them at. BTW this measurement is the circumference. Width is 5/8" . As you know, the 9N-10130 pulley drawing shows the effective diameter at 3.5". Effective diameter is given and measured as an "Over-The-Roll" dimension. This means when rolls, precisely gage pins or gage balls are laid in the VEE-GROOVE, 180° apart, the ED is measured across them. The VEE included angle is 28°. Pulley bore/ID must be square to the hub face w/n .002" TIR.