Grade 80 Tie Down Chain Grade 80 tie down chain, also know as grade 80 alloy, is a higher-strength, heat-treated alloy steel chain primarily used in tiedown applications. The chain is generally equipped with a specific type of clevis grab hook. Grade 80 tie down chain is not approved for overhead lifting. The chain is embossed with 8, 80, or 800. The Grade 80 tie down chain meets requirements of ASTM and NACM. In addition to standard specifications for the chain, we are able to customize specific specifications according to your requirements.