Peerless Grade 80 chain meets the latest guidelines of the National Association of Chain Manufacturers (NACM) and ASTM A391/A391M. This is in line with the higher 4-to-1 design factor required by the International Standards Organization (ISO). For fast identification, Peerless Grade 80 chain is embossed USA and stamped P8. For quality control purposes, Peerless chain is date coded for easy traceability.