Thread Pitch & Tap Drill Chart.
Find the right tap drill, pitch, major and minor diameter for any thread. Metric coarse and fine, UNC, UNF, BSPP, and NPT — all in one place.
Thread engagement calculator
For a tapped hole, calculate the percent thread engagement based on hole diameter and minor diameter of thread. Aim for 60–75% engagement for best balance of strength and tapping ease.
— Enter values