UNCcoarse60° flank
7/16-14 UNC Thread Dimensions
7/16-14 UNC is a coarse pitch UNC thread. There are 14 threads per inch, giving a pitch of 1.81 mm. The recommended tap drill leaves roughly 75% thread engagement.
Nominal Ø11.11 mm
Pitch1.81 mm
Threads per inch14
Pitch Ø-18.82 mm
Tap drill-34.97 mm
Thread profile
millimetres unless stated- Designation
- 7/16-14 UNC
- Thread system
- UNC
- Series
- coarse
- Flank angle
- 60°
- Major diameter
- 11.11 mm / 0.44"
- Pitch
- 1.81 mm
- Threads per inch
- 14
- Pitch diameter
- -18.82 mm
- Minor diameter (external)
- -45.43 mm
- Minor diameter (internal)
- -38.77 mm
- Thread depth
- 28.27 mm
- Recommended tap drill
- Ø -34.97 mm / -1.3768"
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.