Gewinde-Steigungswinkel berechnen

Lead angle and helix angle formula

The lead angle is the angle between the thread helix and a plane perpendicular to the thread axis. It affects cutting geometry, insert shim selection (anvil), and thread milling strategy.

• Lead angle λ = arctan(pitch / (π × pitch diameter))
• Helix angle = 90° − lead angle (complementary)
• Small lead angle = fine thread; large lead angle = coarse or multi-start thread

How to use this Thread Lead Angle Calculator

Enter the thread pitch (or lead for multi-start threads) and the pitch diameter. The calculator gives the lead angle and helix angle in degrees. Use the results to select the correct anvil seat for thread turning inserts.