METRICcoarse60° flank

M12 × 1.75 Thread Dimensions

M12 x 1.75 is a coarse pitch METRIC thread. Pitch is 1.75 mm, equivalent to 14.51 threads per inch. The recommended tap drill leaves roughly 75% thread engagement.

Nominal Ø12 mm
Pitch1.75 mm
Threads per inch14.51
Pitch Ø10.86 mm
Tap drill10.25 mm

Thread profile

millimetres unless stated
Thread profile — M12 x 1.75d 12d2 10.86d3 9.85mm60°P 1.75h3 1.07tap ⌀10.25
M12 × 1.75 — basic profile60° flank angle · Not to scale
Designation
M12 x 1.75
Thread system
METRIC
Series
coarse
Flank angle
60°
Major diameter
12 mm / 0.47"
Pitch
1.75 mm
Threads per inch
14.51
Pitch diameter
10.86 mm
Minor diameter (external)
9.85 mm
Minor diameter (internal)
10.11 mm
Thread depth
1.07 mm
Recommended tap drill
Ø 10.25 mm / 0.4"

How these values are derived

Basic ISO thread geometry uses the fundamental triangle height H = 0.866025 × P. External minor diameter d₃ = d − 1.226869 × P, internal minor diameter D₁ = d − 1.082532 × P. Tap drill is given as nominal diameter minus pitch, which approximates a 75% thread engagement — adjust for tough materials or deep holes.