STANDARD

Current

ÖNORM EN ISO 7720

Issue date: 2025 09 15

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

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.

General information on ÖNORM EN ISO 7720

Format
Paper | 13 Pages
Language
German | English | Download GER/ENG
Publisher
Austrian Standards International

Frequently Asked Questions about ÖNORM EN ISO 7720

When you purchase a standard from the Austrian Standards webshop (e.g. ÖNORM, ISO), a single-user licence is included as standard. This entitles a single person to use the standard. A multi-user licence is required if several employees need access. It enables company-wide, legally compliant use and sharing of standards.

Find out more about the benefits of multi-user licences

Standardization thrives on expertise and participation. Anyone interested can play an active role in its further development – for example, by joining the relevant committee or a working group. In this way, you can help shape the content and contribute to advancing the state of the art.

Find out more about getting involved in standardization

If you have an extensive portfolio of standards, we recommend using a professional standards management tool. With effects 2.0, you can manage your standards centrally and efficiently. You can optimise your procurement processes and benefit from an integrated information and subscription service. This ensures you are always up to date and never miss any relevant developments.

Find out more about the benefits of effects 2.0

Normative References

Here you will find an extract of the normative references. Please refer to the document itself for the full list.

Dokumentnummer Titel Ausgabedatum Art Link
Dokumentnummer
ISO 10683:2018
Titel
Fasteners — Non-electrolytically applied zinc flake coating systems
Ausgabedatum
2018 08 13
Art
Standard
Dokumentnummer
ISO 1891-4:2018
Titel
Fasteners — Vocabulary — Part 4: Control, inspection, delivery, acceptance and quality
Ausgabedatum
2018 05 23
Art
Standard
Dokumentnummer
ISO 225:2010
Titel
Fasteners — Bolts, screws, studs and nuts — Symbols and descriptions of dimensions
Ausgabedatum
2010 09 24
Art
Standard
Dokumentnummer
ISO 2320:2015
Titel
Fasteners — Prevailing torque steel nuts — Functional properties
Ausgabedatum
2015 11 30
Art
Standard
Dokumentnummer
ISO 3269:2019
Titel
Fasteners — Acceptance inspection
Ausgabedatum
2019 07 25
Art
Standard
Dokumentnummer
ISO 3506-2:2020
Titel
Fasteners — Mechanical properties of corrosion-resistant stainless steel fasteners — Part 2: Nuts with specified grades and property classes
Ausgabedatum
2020 04 06
Art
Standard
Dokumentnummer
ISO 4042:2018
Titel
Fasteners — Electroplated coating systems
Ausgabedatum
2018 08 13
Art
Standard
Dokumentnummer
ISO 4759-1:2000
Titel
Tolerances for fasteners — Part 1: Bolts, screws, studs and nuts — Product grades A, B and C
Ausgabedatum
2000 11 09
Art
Standard
Dokumentnummer
ISO 6157-2:1995
Titel
Fasteners — Surface discontinuities — Part 2: Nuts
Ausgabedatum
1995 07 20
Art
Standard
Dokumentnummer
ISO 898-2:2012
Titel
Mechanical properties of fasteners made of carbon steel and alloy steel — Part 2: Nuts with specified property classes — Coarse thread and fine pitch thread
Ausgabedatum
2012 03 16
Art
Standard
Dokumentnummer
ISO 8991:1986
Titel
Designation system for fasteners
Ausgabedatum
1986 11 27
Art
Standard
Dokumentnummer
ISO 8992:2005
Titel
Fasteners — General requirements for bolts, screws, studs and nuts
Ausgabedatum
2005 04 15
Art
Standard
Dokumentnummer
ISO 965-1:2013
Titel
ISO general purpose metric screw threads — Tolerances — Part 1: Principles and basic data
Ausgabedatum
2013 09 13
Art
Standard

Recently Viewed

ÖNORM EN 12312-17

Aircraft ground support equipment - Specific requirements - Part 17: Air conditioning equipment

ÖNORM EN ISO 11638

Resilient floor coverings - Heterogeneous poly(vinyl chloride) flooring on foam - Specification (ISO 11638:2020, including corrected version 2021-09)

ÖNORM EN ISO 25649-7

Floating leisure articles for use on and in the water - Part 7: Additional specific safety requirements and test methods for Class E devices (ISO 25649-7:2024)
€104.46
excl. USt.
€114.91
incl. 10% USt.
Standard
ÖNORM EN ISO 7720 - Fasteners - Prevailing torque hexagon nuts - High nuts (all metal) with slot(s) (ISO 7720:2025)

Customize and purchase single-user license

€104.46
excl. USt.
€114.91
incl. 10% USt.
Free delivery

Subscribe to standards

Your shopping cart is empty

Regarding the newly released ISO 9001, we recommend:

Standard
ÖNORM EN ISO 9001 - Quality management systems - Requirements (ISO 9001:2026)
View details
Seminar [Live-Online]
€749.00
excl. USt.
€898.80
incl. 20% USt.
View details
Seminar [Hybrid]
€675.00
excl. USt.
€810.00
incl. 20% USt.
View details
€49.00
excl. USt.
€58.80
incl. 20% USt.
View details
€2,419.00
excl. USt.
€2,902.80
incl. 20% USt.
View details