Gear according to size or size classification, gear type is divided into standard and non-standard two kinds;

According to the measurement units at home and abroad, gear type is divided into metric and two kinds of english.

Metric gear type

The metric / modulus (M/m), the gear modulus = pitch diameter / outer diameter of the gear tooth number = / (+2 number).

The main types of metric gears are: M0.4, M0.5, M0.6, M0.75, M0.9, M1, M1.5, M2, M2.25, M2.5, M3, M3.5, M4, M4.5, M5, M5.5, M7, M8, M9, M10, M12, M6, M14, M15, M16, M18,, M20, M2.75, M22, M1.75, M24, M0.8, M25, M1.25, M0.7, M26, M28, M30

Inch gear type

DP gear is imperial gear by Europe and the United States (pitch gear), refers to every inch of the number of teeth on the dividing circle diameter, the greater the smaller gear. Diametral pitch DP=z/D (Z - tooth number, D - pitch diameter, inch), in diameter pitch DP units (1/in). Its conversion to metric is m=25.4/DP, that is to say, it is the same as our common modulus.

The main types of British gear are: DP1, DP1.25, DP1.5, DP1.75, DP2.25, DP2.5, DP2.75, DP3, DP4, DP4.5, DP5, DP6, DP7, DP8,, DP9, DP10, DP2, DP12, DP14, DP16