Sprockets is usually classified into normal sprockets, HK sprockets and other sprockets.
1. Standard sprocket
Regular sprockets are ANSI sprockets which might be engaged with regular series roller chains. See P125 for 
dimensions.
You’ll find two kinds of tooth profiles: U-tooth and S-tooth.
two. HK sprocket
HK sprockets might be engaged with HK series roller chains, and those for single strand chains are identical to normal sprockets. Having said that, sprockets for many strand chains are unique from conventional sprockets in sprocket tooth profile.
3. Other sprockets
Other sprockets are made in accordance on the following calculation formulas to suit respective specialty chains.
The sprockets made use of for your following chains are the very same since the normal sprockets in tooth gap kind, but distinctive in tooth thickness (sprocket tooth profile).
4. Calculation of sprocket dimensions
The dimensions of conventional sprockets and also other basic sprockets are calculated as follows. To start with, the diameters of sprockets are calculated from your following calculation formulas.
Following, sprocket tooth profile (the shape from the tooth according to its thickness) is calculated from the following calculation formulas. (The values shown within the following pages had been calculated by these formulas and thought to be the typical values.)
Calculation formulas for diameters and tooth gap kinds Calculation formulas for diameters
Calculation of pitch diameter, tip diameter and caliper diameter
The basic dimensions of a sprocket suitable for any chain pitch of one mm are respectively named pitch diameter component, tip diameter element and caliper diameter issue. The respective things for respective numbers of teeth are listed under. If these aspects are multiplied by chain pitch, the essential dimensions from the corresponding sprocket may be obtained.
Illustration:
During the case of 80 (25.forty mm pitch) with 35 teeth Pitch diameter (Dp) ＝ P×Pitch diameter factor
Calculation formulas for tooth gap kinds
As the most rational tooth gap types through which the stress angle alterations in response for the elongation of the smoothly rotated roller chain with all the lapse of service time, ANSI specify two forms of tooth profiles: U-type and S-type. Usually, S-type tooth profiles are adopted in accordance with ANSI, and our standard sprockets also have S-tooth profiles.
