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Conversion
to inches
Knurling based on
CP (TPI) and DP
„ „ CP (TPI) = Circular Pitch (Teeth Per Inch)
This standard specifies the number of teeth over a distance of 1 inch
(1~25.4 mm). To calculate the pitch, divide 1 inch by the number of
teeth. The profile angle is defined as 70° or 90°, depending on the
number of teeth per inch.
Conversion example:
Specification CP (TPI) = 20
Pitch (mm) =
1 inch (~25.4 mm) : 20 (number of teeth) = 1.27 mm
a = flank angle
„ „ DP = Diametral Pitch
As opposed to CP (TPI) this standard specifies the number of teeth on
the circumference of a circle with a diameter of 1 inch (1"~25.4 mm).
To calculate the pitch, divide the circumference of a 1 inch circle by the
number of teeth.
The profile angle is defined as 80°.
Conversion example:
Specification DP = 64
Pitch (mm) =
1 inch (~25.4) x π (3.14...) : 64 (number of teeth) = 1.25 mm
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