DS DS/EN ISO 7040
DS DSEN SO 7040 1998-FEB-12 Prevalng torque type hexagon nuts wth non-metallc nsert style 1 - Property classes 5 8 and 10
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This International Standard specifies the characteristics of prevailing torque type hexagon nuts, (with non-metallic insert), style 1 - with threads from M3 up to and including M36, in product grade A for threads up to and including M16 and product grade B for threads above M16, and with property classes 5, 8 and 10.