1 Advance Notice of Proposed Rulemaking. 2  This optional step entails publishing the agency's initial analysis of the subject matter, often asking for early public input on key issues. 3  Any data or communications regarding the upcoming rule would be made available to the public for review.
Concentricity tolerance zone controls the median points of a feature of size. Concentricity tolerance is a condition in which the axes of all cross-section elements of a featureâs surface of revolution are common to the axis of a datum feature.
Be careful when applying tolerances to a radius or diameter. A tolerance on a radius will double when measured as a diameter. A tolerance on a radius might be looser than intended, while one on a diameter might be tighter than intended. The effect of this is illustrated in the two gear drawings.