DS EN 22857:1990
DS EN 22857:1990 Ground Thread Taps For Iso Metric Threads Of Tolerances 4H To 8H And 4G To 6G Coarse And Fine Pitches - Manufacturing Tolerances On The Threaded Portion Defines the manufacturing tolerances on the threaded portion of taps for producing the ISO metric threads of tolerance classes 4H to 8H and 4G to 6G.