This Standard Roller Conveyor Chain is based on the minimum tensile strength, the pitch, the type of pin and roller and the features of the plates. The minimum tensile strength, according to preferred numbers, ranges. The pins of these chains are usually solid, but the standard allows them to be produced with hollow pins so that accessories as crossbars fixed to them when two chains are working in parallel. The pitch needs to be chosen on the basis of the operating conditions, the type of product to be conveyed, the frequency of accessories, the space available, etc.