GENERAL TERMS FOR THREADING

You will encounter these terms again and again in connection with taps. With the help of the sketches, you will get an understandable overview here.

General terms

General terms

γ_P/P1 = Chip angle

γ_2P = Chip angle spiral point

γ_r = Back angle

N = Number of flutes

d₃= Core-diameter

Z_b= Land width

N_b= Width of flutes

Explanation of signs

Spiral entry and eccentric radial thread relief

Spiral entry and eccentric radial thread relief

h_a = Chamfer radial thread relief

h_r = Chamfer radial thread relief per land

I₇ = Anschnittlänge

γF_a = Schälanschnittwinkel

Explanation of signs

Types of flutes

about 10° left spiral flutes

about 15° right spiral flutes

about 15° right spiral flutes with interrupted threads

about 35° and 45° right spiral flutes

Spiral entry with oil grooves

Types of flutes

P_f = Twist pitch

Y_F = Twist angle

Explanation of signs

Centrering Types

Internal Cdentering

Full Center Point

Half Center Point

Explanation of signs