TYPES OF CHAMFER FORMS
The types of chamfer are defined in standards DIN 2175 and DIN 2197 for forming taps and cutting taps, respectively.
Form A Form B
Form C
Form D
Form E
Form F
Chamfer form and length
Flute type
TYPES OF CENTRES
The tap manufacturer, according to the diameter and the application, defines the types of centres. Types of centre and chamfer are generally combined together as in the following table, but for specific applications exceptions are possible.
Form A
Form B
Form C
Form D
Form E
M2 ≤ Ø ≤ M8
M2 ≤ Ø ≤ M8
M2 ≤ Ø ≤ M8
M2 ≤ Ø ≤ M8
-
Male centre
M2 ≤ Ø ≤ M6
M4 ≤ Ø ≤ M6
M2 ≤ Ø ≤ M6
M5 ≤ Ø ≤ M6
-
Nr.2-56 ≤ Ø ≤ 1/4"-18 Nr.2-56 ≤ Ø ≤ 1/4"-18 Nr.2-56 ≤ Ø ≤ 1/4"-18 Nr.2-56 ≤ Ø ≤ 1/4"-18
-
Nr.2-64 ≤ Ø ≤ 1/4"-28 Nr.2-64 ≤ Ø ≤ 1/4"-28 Nr.2-64 ≤ Ø ≤ 1/4"-28
-
-
-
-
-
-
-
M8 < Ø ≤ M10
M8 < Ø ≤ M10
M8 < Ø ≤ M10
M8 < Ø ≤ M10
-
Half centre
M6 < Ø ≤ M10
M6 < Ø ≤ M10
M6 < Ø ≤ M10
M6 < Ø ≤ M10
-
5/16"-18 ≤ Ø ≤ 3/8"-16 5/16"-18 ≤ Ø ≤ 3/8"-16 5/16"-18 ≤ Ø ≤ 3/8"-16
-
-
5/16"-24 ≤ Ø ≤ 3/8"-24 5/16"-24 ≤ Ø ≤ 3/8"-24 5/16"-24 ≤ Ø ≤ 3/8"-24
-
-
Ø = 1/8"-28
Ø = 1/8"-28
Ø = 1/8"-28
-
-
Ø > M10
Ø > M10
Ø > M10
Ø > M10
ALL SIZES
Female centre
Ø > M10
Ø > M10
Ø > M10
Ø > M10
ALL SIZES
Ø ≥ 7/16"-14
Ø ≥ 7/16"-14
Ø ≥ 7/16"-14
Ø ≥ 5/16"-18
-
Ø ≥ 7/16"-20
Ø ≥ 7/16"-20
Ø ≥ 7/16"-20
-
-
Ø ≥ 1/4"-19
Ø ≥ 1/4"-19
Ø ≥ 1/4"-19
-
-
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