The smallest chain complying to ANSI is 25 of six.35 mm pitch. Having said that, in response to the demands for smaller chains lately for substantial technologies machinery such as office equipment, healthcare machines and industrial robots, we deliver 15 of 4.7625 mm (3/16 inch) pitch and in addition 15H1 as 
being a high-power model of 15. These high precision chains are produced underneath significant high quality management particularly required for little sizes, taking wear resistance also into account.
Choice of chain
Refer on the “Low-speed selection”. However, the chain operation speed may be set significantly substantial determined by the kind of lubrication as shown in the table below.
Connecting backlinks and offset backlinks
R connecting hyperlinks are used for compact pitch chains. Having said that, considering the fact that their strength is decrease than that of your base chain, and since the clip is prone to come off in substantial velocity operation, the use of connecting back links is not proposed. Use a loop chain without having attaching connecting back links.
Offset hyperlinks are available for chains other than 15 and 15H1, but their use is not really suggested for the similar reason as stated for your R Connecting links.
Operating velocity and style of lubrication
15: A higher precision mini-pitch bushing chain which is smaller sized than a compact drive chain for common applications, 25
25: Smallest bushing chain amid ANSI regular chains working with curl bushings.
35: A ANSI standard bushing chain suitable for small precision machines that require substantial strength.
