scope:

This International Standard specifies the mechanical and perfo rmance properties for prevailing torque type steel nuts when t ested at an ambient temperature range of +10 °C to +35 °C. It includes a single test to determine the prevailing torque prop erties (performance properties) and/or the torque/clamp force properties. This International Standard applies to prevailing torque all metal type nuts and prevailing torque non-metallic insert type nuts: a) with triangular ISO thread according to ISO 68-1; b) with diameter/pitch combination according to ISO 2 61 and ISO 262; c) with coarse pitch thread M3 to M39 and mech anical properties according to ISO 898-2; d) with fine pitch t hread M8 1 to M39 3 and mechanical properties according to ISO 898-6; e) within the temperature range of;50 °C to +150 °C for prevailing torque all metal type nuts; f) within the tempe rature range of;50 °C to +120 °C for prevailing torque non-m etallic insert type nuts.