METRICcoarse60° flank
M16 × 2 Thread Dimensions
M16 x 2 is a coarse pitch METRIC thread. Pitch is 2 mm, equivalent to 12.7 threads per inch. The recommended tap drill leaves roughly 75% thread engagement.
Nominal Ø16 mm
Pitch2 mm
Threads per inch12.7
Pitch Ø14.7 mm
Tap drill14 mm
Thread profile
millimetres unless stated- Designation
- M16 x 2
- Thread system
- METRIC
- Series
- coarse
- Flank angle
- 60°
- Major diameter
- 16 mm / 0.63"
- Pitch
- 2 mm
- Threads per inch
- 12.7
- Pitch diameter
- 14.7 mm
- Minor diameter (external)
- 13.55 mm
- Minor diameter (internal)
- 13.83 mm
- Thread depth
- 1.23 mm
- Recommended tap drill
- Ø 14 mm / 0.55"
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.