ISO 10513:2025 pdf download,Fasteners – Prevailing torque hexagon nuts – High nuts (all metal), with fine pitch thread.
ISO 10513:2025 specifies characteristics for prevailing torque hexagon “high” nuts made of all metal, designed to resist loosening by providing a prevailing-torque feature when assembled with a mating threaded part. The standard focuses on nuts with metric fine-pitch threads in the diameter range of 8 mm to 39 mm, and it covers both steel and stainless steel variants. It defines the key dimensional characteristics for the high nut style, including overall height and the wrenching height, and explains how the prevailing-torque feature affects height limits and tolerances so that the height tolerance behavior does not follow the usual ISO IT tolerance code system in the same way. It also states product grades (A and B) and indicates that, if additional requirements are needed, users can select corresponding material property classes and stainless steel grades from referenced ISO fastener property standards