This is a drawing of a CONNECTING ROD center distance master which was a set of 4 masters consisting of a center distance master, a bend master, and 2 twist masters . Notice the pin and crank bore tolerances of +/_ .00005 in. and the center distance tolerance of +/- .0001 in. These are typical tolerances that Tomco is capable of producing on part like masters of any configuration. All tolerances less than.0002 in. are lapped surfaces creating longer wear life. We also have the capability of certifying close tolerance dimensions if required.