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ISO 7040:2025

Fasteners - Prevailing torque hexagon nuts - Regular nuts (with non-metallic insert)
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This document specifies the characteristics of prevailing torque hexagon regular nuts (with non metallic insert), in steel and stainless steel, with metric coarse pitch thread M3 to M39, and with product grades A and B.

NOTE            These nuts are designed with an overall height equal to mmin (as specified in ISO 898-2 and ISO 4032 for style 1) plus the prevailing torque feature. The height of the prevailing torque feature (hmax – mmin) for the non-metallic insert is identical for regular, high and thin nuts for a given diameter.

Nuts with sizes D < M5 and design principles in accordance with style 1 are specified in Annex A.

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.

SDO ISO: International Organization for Standardization
Document Number ISO 7040
Publication Date Jan. 1, 2025
Language en - English
Page Count
Revision Level
Supercedes
Committee ISO/TC 2/SC 12
Publish Date Document Id Type View
Jan. 1, 2025 ISO 7040:2025 Revision
Dec. 15, 2012 ISO 7040:2012 Revision