This European standard specifies the test method which allows to determine with a single test the torque/clamp force properties and/or the prevailing torque properties (performance properties) for prevailing torque type steel nuts when tested at an ambient temperature range of + 10 °C to + 35 °C. It applies to prevailing torque all metal type nuts and prevailing torque non-metallic insert type nuts - with triangular ISO thread according to ISO 68; - with diameter/pitch combination according to ISO 261 and ISO 262; - with thread tolerance 6H according to ISO 965-2, except for the prevailing torque feature; - with coarse pitch thread M3 to M39 and mechanical properties according to ISO 898-2; - with fine pitch thread M8 Ã- 1 to M39 Ã- 3 and mechanical properties according to ISO 898-6; - within the temperature range of -50 °C to + 150 °C for all metal type nuts; - within the temperature range of -50 °C to + 120 °C for nuts with non-metallic insert.

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