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metric-gland-hole-gauge-m12-m63

hole gauge plate, 332.7 × 79.4 × 3 mm, eight holes at the Lapp T21 (EN 60423) hole diameters 12.3, 16.3, 20.3, 25.3, 32.3, 40.4, 50.4, 63.4 mm (M12, M16, M20, M25, M32, M40, M50, M63), smallest first, 8 mm between hole edges; plate thickness and spacing are Xem choices

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

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From the full sheet

Metric cable glands M12–M63: thread, panel hole (EN 60423), cable range, height, key size + hole gauge: every size, notes, mating features and sources. What mounting hole does an M12, M16, M20, M25 or M32 cable gland need, and what cable does it take?