DIN EN ISO 2320:2009-03

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