DOUBLE PITCH CHAIN SERIES HOLLOW PIN CHAIN For food handling conveyors, Hollow Pin Chains are available in ANSI standard short pitch series (40HP - 80HP), double pitch series with standard rollers (C2040HP - C2080HP), and large rollers (C2042HP - C2082HP). Attachments or cross-rods can be inserted at any desired spacing, which provided great design versatility. Changes can be made without removing the chain from the conveyor.