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ISO 7720:2025

Fasteners — Prevailing torque hexagon nuts — High nuts (all metal) with slot(s)

Jun 10, 2025

General information

60.60     Jun 10, 2025

ISO

ISO/TC 2/SC 12

International Standard

21.060.20  

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Buying

Published

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Scope

This document specifies the characteristics of prevailing torque (all metal) hexagon high nuts with slot(s), 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 mmin as specified ISO 4032 and with an overall height h greater than in ISO 7042, in order to accommodate the prevailing torque feature with slot(s); this height h contributes to the nut resistance due to the number of engaged threads. hmin values have been calculated as a function of hmax together with a ratio hmax/D that progresses regularly with increasing diameter; therefore, the tolerance (hmax – hmin) does not follow the ISO code system for tolerances (IT system).
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.

Life cycle

PREVIOUSLY

WITHDRAWN
ISO 7720:2012

NOW

PUBLISHED
ISO 7720:2025
60.60 Standard published
Jun 10, 2025

National adoptions

dnaSRPS EN ISO 7720:2025  
ISS

Fasteners - Prevailing torque hexagon nuts - High nuts (all metal) with slot(s) (ISO 7720:2025)

50.99   FDIS or proof approved for publication

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