METRICcoarse60° flank
M27 × 3 Thread Dimensions
M27 x 3 is a coarse pitch METRIC thread. Pitch is 3 mm, equivalent to 8.47 threads per inch. The recommended tap drill leaves roughly 75% thread engagement.
Nominal Ø27 mm
Pitch3 mm
Threads per inch8.47
Pitch Ø25.05 mm
Tap drill24 mm
Thread profile
millimetres unless stated- Designation
- M27 x 3
- Thread system
- METRIC
- Series
- coarse
- Flank angle
- 60°
- Major diameter
- 27 mm / 1.06"
- Pitch
- 3 mm
- Threads per inch
- 8.47
- Pitch diameter
- 25.05 mm
- Minor diameter (external)
- 23.32 mm
- Minor diameter (internal)
- 23.75 mm
- Thread depth
- 1.84 mm
- Recommended tap drill
- Ø 24 mm / 0.94"
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.