DS DS/EN 22857
DS DSEN 22857 1990-MAR-27 Ground thread taps for SO metrc threads of tolerances 4H to 8H and 4G to 6G coarse and fne ptches - Manufacturng tolerances on the threaded porton
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The standard specifies 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.