50-2Ss 304 Ss Cl Sc Type ASME/ANSI RllrChn Double Strand 5/8" Pit,PK5 Each connecting link is individually packaged in a sealed plastic bag. Connecting links are used to connect the ends of the roller chain strand into an endless loop. They offer excellent resistance against many forms of chemical attack and operate in temperatures ranging from -250 to +750 degrees F..