DS DS/EN ISO 7042
DS DSEN SO 7042 1998-FEB-12 Prevalng torque type all-metal hexagon nuts - Property classes 5 8 10 and 12
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This International Standard specifies the characteristics of prevailing torque type all-metal hexagon nuts, style 2, with treads from M5 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, 10 and 12.