Draft Document – Round steel link chains – Round steel link chains, pitch 5d, for chain conveyors – Part 1: Grade 3, quenched and tempered
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 07/01/2014

Draft Document – Round steel link chains – Chains strands from round steel link chains, nominal pitch: 5×d, for the operation in bucket elevators – Part 1: From case hardened quality steel, Grade 2
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 06/01/2017