The smallest chain complying to ANSI is 25 of six.35 mm pitch. Nonetheless, in response for the demands for smaller sized chains in recent years for higher technological innovation machinery such as workplace gear, health-related machines and industrial robots, we offer 15 of four.7625 mm (3/16 inch) pitch and in addition 15H1 being a high-power version of 15. These substantial precision chains are manufactured underneath severe high quality control specifically expected for small sizes, taking wear resistance also into account.
Choice of chain
Refer to your “Low-speed selection”. On the other hand, the chain operation speed could be set substantially high according to the kind of lubrication as shown in the table under.
Connecting back links and offset back links
R connecting links are applied for compact pitch chains. Having said that, because their power is decrease than that of the base chain, and because the clip is more likely 
to come off in substantial speed operation, using connecting hyperlinks just isn’t recommended. Use a loop chain without the need of attaching connecting links.
Offset links can be found for chains other than 15 and 15H1, but their use isn’t recommended for that very same explanation as stated for your R Connecting hyperlinks.
Working speed and form of lubrication
15: A high precision mini-pitch bushing chain that is certainly smaller than a compact drive chain for general applications, 25
25: Smallest bushing chain among ANSI conventional chains applying curl bushings.
35: A ANSI regular bushing chain suitable for modest precision machines that need higher power.
