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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

γP/P1 = Chip angle

γ2P = Chip angle spiral point

γr = Back angle

N = Number of flutes

d3 = Core-diameter

Zb = Land width

Nb = Width of flutes

Spiral entry and eccentric radial thread relief

Spiral entry and eccentric radial thread relief

ha = Chamfer radial thread relief 

hr = Chamfer radial thread relief per land

I7 = Anschnittlänge

γFa = Schälanschnittwinkel

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

Pf = Twist pitch

YF = Twist angle

Centrering Types

Internal Cdentering

Full Center Point

Half Center Point