ISO 7042:2025, Fasteners — Prevailing torque hexagon nuts — High nuts (all metal)

This document specifies the characteristics of prevailing torque (all metal) hexagon high nuts, in steel and stainless steel, with metric coarse pitch thread M5 to M39, and with product grades A and B.

NOTE These nuts are designed with an overall heigth h min = m min (as specified in ISO 898-2 and ISO 4033 for style 2) plus the prevailing torque feature. h max has been established in function of h min; therefore, the tolerance (h max – h min) does not follow the ISO code system for tolerances (IT system). The wrenching height m w,min corresponds to the values specified for style 1.

If in certain cases other specifications are requested, property classes and stainless steel grades can be selected from ISO 898-2 or ISO 3506-2.