EVS-EN ISO 2320:2015

This International Standard specifies the functional 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 and/or the torque/clamp force properties.
It 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 261 and ISO 262;
c) with coarse pitch thread M5 to M39 or with fine pitch thread M8×1 to M39×3;
d) with mechanical properties according to ISO 898-2;
NOTE 1 All metal type nuts conforming to the requirements of this International Standard have been used in
applications ranging from -50 C to +150 C.
NOTE 2 Non-metallic insert type nuts conforming to the requirements of this International Standard have been used in
applications ranging from -50 C to +120 C.
WARNING Temperatures outside the ambient temperature range can influence the functional properties
(torque/clamp force and prevailing torque properties), see Annex A.