Historical
DIN EN ISO 7040:2013
Prevailing torque type hexagon regular nuts (with non-metallic insert) - Property classes 5, 8 and 10 (ISO 7040:2012); German version EN ISO 7040:2012
This document specifies the characteristics of prevailing torque type hexagon regular nuts (with non-metallic insert) with threads from M3 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 and 10.
Deutsches Institut für Normung [din]