Sprockets could be classified into common sprockets, HK sprockets along with other sprockets.
one. Normal sprocket
Standard sprockets are ANSI sprockets which might be engaged with common series roller chains. See P125 for dimensions.
You’ll find two forms of tooth profiles: U-tooth and S-tooth.
two. HK sprocket
HK sprockets could be engaged with HK series roller chains, and individuals for single strand chains are identical to conventional sprockets. Even so, sprockets for a number of strand chains are various from standard sprockets 
in sprocket tooth profile.
three. Other sprockets
Other sprockets are designed according for the following calculation formulas to suit respective specialty chains.
The sprockets utilized to the following chains are the exact same since the common sprockets in tooth gap type, but distinct in tooth thickness (sprocket tooth profile).
four. Calculation of sprocket dimensions
The dimensions of typical sprockets and other basic sprockets are calculated as follows. At first, the diameters of sprockets are calculated from the following calculation formulas.
Next, sprocket tooth profile (the shape in the tooth dependant upon its thickness) is calculated from the following calculation formulas. (The values shown within the following pages had been calculated by these formulas and regarded as the conventional values.)
Calculation formulas for diameters and tooth gap forms Calculation formulas for diameters
Calculation of pitch diameter, tip diameter and caliper diameter
The fundamental dimensions of the sprocket appropriate for a chain pitch of 1 mm are respectively named pitch diameter component, tip diameter component and caliper diameter issue. The respective things for respective numbers of teeth are listed beneath. If these aspects are multiplied by chain pitch, the fundamental dimensions from the corresponding sprocket could be obtained.
Instance:
From the situation of 80 (25.forty mm pitch) with 35 teeth Pitch diameter (Dp) ＝ P×Pitch diameter issue
Calculation formulas for tooth gap forms
Because the most rational tooth gap types in which the strain angle alterations in response to the elongation of the smoothly rotated roller chain together with the lapse of service time, ANSI specify two kinds of tooth profiles: U-type and S-type. On the whole, S-type tooth profiles are adopted in accordance with ANSI, and our conventional sprockets also have S-tooth profiles.
