NOTE These nuts are designed with an overall height hmin = mmin (as specified in ISO 898‑2 and ISO 4032 for style 1) plus the prevailing torque feature. hmax has been established in function of hmin; therefore, the tolerance (hmax – hmin) does not follow the ISO code system for tolerances (IT system).
BSI recommends this version of standard for organisations operating in or with the UK. The ISO edition is available here if required.