100-1R Connector Link Precision ANSI Roller Chain - 1 1/4" Pitch - 100 connecting links are also commonly referred to as #100 master links and are made for ANSI 100 roller chain, it is engineered to connect two ends of chain together or for making quick miscellaneous repairs. Premier Series connecting links are manufactured utilizing top-grade steel alloys, are supplied with heat-treated and shot-peened parts, and are the highest strength ANSI links we offer. A common issue with a chain is that the connecting link is considered the "weakest link", specialty advanced engineering on this link has made it as strong as possible to prevent this issue.