16.1950mm to 21.2575mm Deltronic PPM25 (.0025mm step) with a center nominal size

Description

PPM25 “Metric X” Gage-Sets contain a center nominal size gage plus 12 SIZES RANGING UPWARD in .0025mm steps above the nominal and 12 SIZES RANGING DOWNWARD in .0025mm steps below the nominal. Sets may be ordered with any desired nominal size, as needed. The price of the set is shown in various ranges as listed below. Nominal determines set coverage.

Users of sets indicate that along with their ability to functionally measure holes to a .0100mm resolution, the individual components can be used as setting masters to zero snap gages, indicator and electronic comparators, passometers, etc. at a cost far below expensive gage blocks. Many shops, still working to thousandth tolerances have begun to order these HT24 sets as replacements for thousandth sizes in order to meet the growing need to inspect finer tolerances.