SIST EN ISO 10484:2004
(Main)Widening test on nuts (ISO 10484:1997)
Widening test on nuts (ISO 10484:1997)
This document supercedes EN 493:1992.
Aufweitversuch an Muttern (ISO 10484:1997)
Diese Internationale Norm legt das Prüfverfahren zur Beurteilung der Frage fest, ob Muttern mit Oberflächenfehlern, wie sie in ISO 6152-2 dargestellt sind, angenommen werden können. Sie gilt nicht für Muttern aus Automatenstahl.
Sie gilt für Muttern mit
- Festigkeitsklassen nach ISO 898-2 und ISO 898-6;
- Gewinde-Nenndurchmessern, d, von 5 mm bis 39 mm;
Produktklassen A und B.
Essai d'évasement des écrous (ISO 10484:1997)
Preskus širitve za matice (ISO 10484:1997)
General Information
- Status
- Published
- Publication Date
- 31-Oct-2004
- Technical Committee
- ISEL - Mechanical elements
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 01-Nov-2004
- Due Date
- 01-Nov-2004
- Completion Date
- 01-Nov-2004
Relations
- Effective Date
- 22-Dec-2008
- Effective Date
- 01-Jul-2014
Overview
The SIST EN ISO 10484:2004 standard, titled Widening Test on Nuts (ISO 10484:1997), establishes a uniform procedure for testing the structural integrity and surface acceptability of mechanical nuts. Developed by the International Organization for Standardization (ISO) and adopted as a European Standard by CEN, this document supersedes the previous EN 493:1992 standard. It applies specifically to nuts with property classes defined in ISO 898-2 and ISO 898-6, covering nominal thread diameters from 5 mm to 39 mm, and product grades A and B.
This standard is critical for manufacturers, quality control professionals, and engineers to ensure reliability and performance of nuts in various mechanical assemblies.
Key Topics
Test Scope: Applies to nuts excluding those made from free cutting steel, ensuring that nuts meet surface discontinuity criteria specified in ISO 6157-2.
Test Principle: The widening test involves removing threading to the nominal diameter, then pushing a tapered mandrel through the nut hole. The widening of the nut hole, expressed as a percentage of the hole diameter, is measured to determine acceptability.
Mandrel Specifications: The tapered mandrel must be polished, have a hardness of at least 45 HRC, and meet precise dimensional tolerances. Two mandrel sizes correspond to widening measurements of either 4% or 6%.
Test Procedure: Lubricate the mandrel with molybdenum disulphide (MoS₂) for smooth insertion, then insert it slowly (maximum 25 mm/min) under axial load until it reaches the cylindrical part of the hole.
Acceptance Criteria:
- Nuts with property classes 4 to 12 require a minimum 6% widening.
- Property classes 04 and 05 require a minimum 4% widening.
- Prevailing torque type nuts (per ISO 2320) have a reduced widening requirement, 20% less than hexagon nuts.
Failure Identification: Premature fracture or complete wall breakage before meeting widening percentages constitutes failure. Verification can include cutting the nut to confirm fracture location.
Applications
The SIST EN ISO 10484:2004 widening test standard is essential for:
Quality Control in Fastener Manufacturing
Ensuring nuts meet mechanical and surface quality standards to prevent failures in critical applications.Mechanical Engineering Design
Selecting nuts with verified mechanical properties suited for load-bearing, fastening, and vibration-resistant assemblies.Automotive and Aerospace Industries
Where safety-critical fasteners require rigorous testing to meet performance and durability standards.Standardized Product Certification
Enabling manufacturers to certify and label nuts compliant with European and international fastener quality requirements.
Related Standards
- ISO 898-2 – Mechanical properties of fasteners: Nuts with specified proof load values (Coarse thread).
- ISO 898-6 – Mechanical properties of fasteners: Nuts with specified proof load values (Fine pitch thread).
- ISO 6157-2 – Surface discontinuities: Requirements for nuts.
- ISO 2320 – Prevailing torque type steel hexagon nuts: Mechanical and performance requirements.
By implementing the SIST EN ISO 10484:2004 standard, organizations ensure that nuts used in engineering applications comply with internationally recognized safety and performance benchmarks. This standard supports product reliability and contributes to the overall integrity of mechanical fastening solutions.
Frequently Asked Questions
SIST EN ISO 10484:2004 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Widening test on nuts (ISO 10484:1997)". This standard covers: This document supercedes EN 493:1992.
This document supercedes EN 493:1992.
SIST EN ISO 10484:2004 is classified under the following ICS (International Classification for Standards) categories: 21.060.20 - Nuts. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN ISO 10484:2004 has the following relationships with other standards: It is inter standard links to SIST EN 493:2001, oSIST prEN ISO 10484:2014. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
SIST EN ISO 10484:2004 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
01-november-2004
1DGRPHãþD
SIST EN 493:2001
Preskus širitve za matice (ISO 10484:1997)
Widening test on nuts (ISO 10484:1997)
Aufweitversuch an Muttern (ISO 10484:1997)
Essai d'évasement des écrous (ISO 10484:1997)
Ta slovenski standard je istoveten z: EN ISO 10484:2004
ICS:
21.060.20 Matice Nuts
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
EN ISO 10484
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2004
ICS 21.060.20 Supersedes EN 493:1992
English version
Widening test on nuts (ISO 10484:1997)
Essai d'évasement des écrous (ISO 10484:1997) Aufweitversuch an Muttern (ISO 10484:1997)
This European Standard was approved by CEN on 1 July 2004.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the Central Secretariat or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2004 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 10484:2004: E
worldwide for CEN national Members.
Foreword
The text of ISO 10484:1997 has been prepared by Technical Committee ISO/TC 2 "Fasteners”
of the International Organization for Standardization (ISO) and has been taken over as EN ISO
10484:2004 by Technical Committee CEN/TC 185 "Threaded and non-threaded mechanical
fasteners and accessories", the secretariat of which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of
an identical text or by endorsement, at the latest by January 2005, and conflicting national
standards shall be withdrawn at the latest by January 2005.
This document supersedes EN 493:1992.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of
the following countries are bound to implement this European Standard: Austria, Belgium,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary,
Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
Endorsement notice
The text of ISO 10484:1997 has been approved by CEN as EN ISO 10484:2004 without any
modifications.
NOTE Normative references to International Standards are listed in annex ZA (normative).
Annex ZA
(normative)
Normative references to international publications
with their relevant European publications
This European Standard incorporates by dated or undated reference, provisions from other
publications. These normative references are cited at the appropriate places in the text and the
publications are listed hereafter. For dated references, subsequent amendments to or revisions of
any of these publications apply to this European Standard only when incorporated in it by
amendment or revision. For undated references the latest edition of the publication referred to
applies (including amendments).
NOTE Where an International Publication has been modified by common modifications, indicated
by (mod.), the relevant EN/HD applies.
Publication Year Title EN Year
ISO 898-2 1992 Mechanical properties of fasteners - EN 20898-2 1993
Part 2: Nuts with specified proof
load values - Coarse thread
ISO 2320 1997 Prevailing torque type steel hexagon EN ISO 2320 1997
nuts - Mechanical and performance
requirements
INTERNATIONAL ISO
STANDARD 10484
First edition
1997-11-01
Widening test on nuts
Essai d'évasement des écrous
A
Reference number
ISO 10484:1997(E)
ISO 10484:1997(E)
Foreword
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