METRICfine60° flank

M10 × 1 fine Thread Dimensions

M10 x 1 (fine) is a fine pitch METRIC thread. Pitch is 1 mm, equivalent to 25.4 threads per inch. The recommended tap drill leaves roughly 75% thread engagement.

Nominal Ø10 mm
Pitch1 mm
Threads per inch25.4
Pitch Ø9.35 mm
Tap drill9 mm

Thread profile

millimetres unless stated
Thread profile — M10 x 1 (fine)d 10d2 9.35d3 8.77mm60°P 1h3 0.61tap ⌀9
M10 × 1 fine — basic profile60° flank angle · Not to scale
Designation
M10 x 1 (fine)
Thread system
METRIC
Series
fine
Flank angle
60°
Major diameter
10 mm / 0.39"
Pitch
1 mm
Threads per inch
25.4
Pitch diameter
9.35 mm
Minor diameter (external)
8.77 mm
Minor diameter (internal)
8.92 mm
Thread depth
0.61 mm
Recommended tap drill
Ø 9 mm / 0.35"

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.