C2100H Roller Link ASME/ANSI Double Pitch RllrChn, 2-1/2" Pitch,PK5 They are available to be installed in the field to repair damaged parts or lengthen existing strands as needed however two connecting links (sold separately) are required for field installation. These component parts possess solid bushings and rollers for improved strength and wear life. 4 American roller chain standard for conveyor series double pitch chains..