DIAMOND® dIamond double-pitch series chain do u b l e-pitch power transmission roller chain These chains, produced to ASME/ANSI B29.3 standards, have figure-eight style link plates. Their dimensions are similar to Standard Series chains with the exception of the pitch, which is twice that of the Standard Series chains. The increase in pitch means that only half the number of component parts are required per foot which can significantly lower the cost. Typical uses for these types of chains include light load drives commonly found in agricultural machinery. *Maximum values are shown. ASME/ANSI 60 and larger chains ae available as cottered or riveted type design.