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M20 hex nut

M20 hex nut: 30 AF × 18.0

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

STEP STL free, CC BY 4.0 (credit "Xem Studio")

Dimensions

thread	M20
af_mm	30
corners_mm	34.64
height_mm	18.0

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From the full sheet

Hex nuts, M10 to M24 (ISO 4032 / DIN 934): every size, notes, mating features and sources. What size is an M16 nut?

Other sizes

M10 hex nut
M12 hex nut
M14 hex nut
M16 hex nut
M24 hex nut