Wherever there is milkweed there will be Monarch butterflies. The monarch is widely distributed across North America, from Central America northwards to southern Canada, and from the Atlantic to the Pacific coasts.
The pitch diameter (often called the effective diameter) of a parallel thread is the diameter of the imaginary co-axial cylinder which intersects the surface of the thread in such a manner that the intercept on a generator of the cylinder, between the points where it meets the opposite flanks of a thread groove, is equal to half the nominal pitch of the thread.
A tolerance class is made up of two parts, a tolerance grade and a tolerance position. A number of tolerance grades have been established for the pitch and crest diameters (the crest diameter is the minor diameter in the case of a nut thread and the major diameter in the case of a bolt thread.