Hy 32vld, way back when when I was learning about vehicle maintenance my instructor brought up the subject of the different "class of fit" for some fasteners. The subject he brought up was the relationship of the fit between a wheel retaining nut and the stud/bolt it was installed on. He went on to say that the fit between the two components was more precise than the standard nut and bolt and that when trying to assemble by hand you might find it difficult to get the two components together. He taught us to never use lube of any kind when installing any type of wheel nut or bolt and never use a standard tap or die to clean the threads as this would destroy the precise fit between the parts. This advice has always stayed with me, and I have replaced many studs and nuts when the fit became loose to any degree, hope that helps.
