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Panel-hole gauge plate for circular-connector receptacles

Panel-hole gauge plate for circular-connector receptacles: six through holes Ø8.2 (M8 × 0.5), 12.2 (M12 × 1), 15.3 (PG9), 16.1 (M16 × 1.5), 20.1 (M20 × 1.5), 20.5 (PG13.5), smallest first, hole diameters as in the Pepperl+Fuchs mounting table; plate 136.4 × 34.5 × 3 mm with 3 mm corners is an example

Exact dimensions. True size, no tolerance added. Threads are plain cylinders at the major diameter.

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From the full sheet

M12 and M8 circular sensor connectors: thread, coding A / B / D / X, pin counts and panel-mount hole sizes (+ hole gauge): every size, notes, mating features and sources. What are the M12 and M8 sensor connector codings, pin counts and standards, and what hole size does an M12 (M16 or PG9) panel-mount receptacle need?