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This standard covers types, sizes, tolerances, marking and nomenclature for hobs of one-piece construction used for generating involute gears, involute splines, parallel side splines, involute serrations and roller chain sprockets. The purpose of this standard is to provide information on standard types, sizes, tolerances, marking and nomenclature of hobs to encourage uniformity in specifications. The inclusion of dimensional data in this Standard is not intended to imply that all of the products described are stock production sizes. Consumers are requested to consult with manufacturers concerning availability of products.