Such practice became so common and the chains of such universal use that in 1948 the Roller Chain Technical Committee of the Asso¬ciation of Roller and Silent Chain Manufacturers developed these Standards which were submitted for adoption as an American Standard.nThis American Standard is for a Limited Series of Double-Pitch Power Transmission Roller Chains, Supplements the Base Chain Series which conforms to American Standard ASA B29.1-1950, and differs therefrom only in pitch. This pitch has been doubled.nSupplementary Information on Speed and Power Transmission Ratings indicates their especial usefulness for drives having slow to moderate speeds, moderate loads and long centers.
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