“U” stands for “unequally disposed profile.” This specifies the range of run-out of the offset amount from the tolerance zone (tolerance zone limit) in terms of the profile tolerance of a plane. “UZ” is used for annotation according to the ISO standards.
Toleranced feature
Indication of symbols, tolerances, types of geometric tolerances, position, and other requirements.
Movable datum target (ASME only; proposed for ISO)
A specified datum target and other datums associated with it can be moved. For example, even when a part is attached to a target, changing the shape of the target, the datum target and the datum can be moved.
面对现场(ASME only)
Machining that creates a counterbore enlarges another coaxial hole.
Specification that assigns tolerance to the assembled components according to statistics. By applying statistical tolerance, the tolerance for each component can be increased, reducing the clearance between the components and the mating parts. While this can improve product performance and/or reduce production costs, the application of this tolerance requires appropriate statistical process management as a prerequisite.
