EN 14399-6:2015
(Main)High-strength structural bolting assemblies for preloading - Part 6: Plain chamfered washers
General Information
- Abstract
This European Standard specifies, together with EN 14399 1 and EN 14399 2, hardened and tempered chamfered plain washers with chamfer intended for bolting assemblies with large series hexagon high-strength structural bolts and nuts with thread sizes from M12 to M36 inclusive.
Washers according to this standard are not intended to be used in direct contact with oversized or slotted holes.
NOTE Attention is drawn to the importance of ensuring that the washers are correctly used if satisfactory results are to be obtained. For recommendations concerning proper application, reference to EN 1090–2 is made.
- Status
- Published
- Publication Date
- 17-Feb-2015
- Withdrawal Date
- 29-Nov-2016
- Technical Committee
- CEN/TC 185 - Threaded and nonthreaded mechanical fasteners and accessories
- Drafting Committee
- CEN/TC 185/WG 6 - Structural bolting
- Current Stage
- 9093 - Decision to confirm - Review Enquiry
- Start Date
- 16-Apr-2023
- Completion Date
- 17-Sep-2026
- Directive
- Not Harmonized97/23/EC - Pressure equipment
Overview
EN 14399-6:2015 is a European Standard developed by CEN focusing on high-strength structural bolting assemblies for preloading, specifically covering plain chamfered washers. This standard applies to hardened and tempered plain washers with chamfers designed for use alongside large series hexagon high-strength structural bolts and nuts, with thread sizes ranging from M12 to M36 inclusive. It forms part 6 of the EN 14399 series, which collectively addresses different components and requirements for bolting assemblies in structural applications.
The standard plays a critical role in ensuring the reliability, safety, and performance of bolted joints in steel construction by specifying precise dimensions, materials, mechanical properties, and marking requirements for chamfered washers. It is intended for use in conjunction with EN 14399-1 and EN 14399-2 to ensure compatibility and preloading efficiency.
Key Topics
Scope and Application:
Defines requirements for hardened, tempered plain chamfered washers compatible with high-strength bolts and nuts in structural bolting preloading assemblies. Washers are not designed for direct contact with oversized or slotted holes.Dimensions and Tolerances:
Includes detailed dimensional specifications such as washer diameter, thickness, chamfer size, and tolerances for thread sizes M12 through M36. Washers must be manufactured within these tight tolerances to guarantee functionality and uniform load distribution.Material and Mechanical Properties:
Washers must be made from steel with a hardness range of 300 HV to 370 HV. The material must withstand high compressive stresses without deformation to maintain bolted joint integrity during preloading.Marking and Designation:
Markings on the washers include the manufacturer’s identification and the letter "H" denoting hardened washers. For assemblies in systems HR or HV, the washer may be marked accordingly to ensure correct system identification, preventing mixing of incompatible parts.Coatings and Surface Treatments:
Washers can be uncoated (“as processed”) or coated using hot dip galvanizing per EN ISO 10684. Other coatings are negotiable but must not impair mechanical or functional characteristics. Cadmium coatings are prohibited due to health and safety concerns.Compatibility with Bolting Systems:
The standard is integrated with other parts of EN 14399, which cover nuts, bolts, washers, and additional components in related bolting assembly systems such as HR, HV, and HRC. Proper component matching is emphasized to achieve required preload and structural strength.Reference Documents:
EN 14399-6 references other critical standards including EN 14399-1, EN 14399-2, EN ISO 3269 (acceptance inspection), EN ISO 4759-3 (plain washer tolerances), and EN ISO 10684 (coatings).
Applications
EN 14399-6 chamfered plain washers are widely used in:
- Steel Construction: Ensuring structural bolted connections in buildings, bridges, and industrial facilities meet preloading requirements for safety and durability.
- Preloaded Bolted Assemblies: Used as key components in assemblies that require specific preload levels for stability and fatigue resistance.
- Large Series Hexagon Bolting: Specifically designed for use with continuously produced hexagon bolts and nuts with nominal thread diameters between M12 and M36.
- Structural Connections without Oversized or Slotted Holes: Ensures washers perform optimally in standard hole conditions, preventing uneven load distribution or damage.
The standardized use of these washers improves joint reliability, aids in proper load transfer, and helps prevent loosening or failure in critical structural applications.
Related Standards
EN 14399-6 is part of the comprehensive EN 14399 series, including but not limited to:
- EN 14399-1: General requirements for high-strength structural bolting assemblies.
- EN 14399-2: Suitability for preloading tests and performance.
- EN 14399-3 & 7: System HR bolt and nut assemblies and countersunk head variants.
- EN 14399-4 & 8: System HV bolt and nut assemblies and fit bolts.
- EN 14399-5: Plain washers without chamfer.
- EN 14399-9: Direct tension indicators for bolts and nuts.
- EN 14399-10: Assemblies with calibrated preload.
Other complementary standards include:
- EN 1090-2: Execution of steel structures - technical requirements relevant for proper application of washers.
- ISO 272: Fasteners - Hexagon products - widths across flats, important for bolt and nut sizing.
Keywords: EN 14399-6:2015, high-strength bolting assemblies, plain chamfered washers, structural bolts, preloading washers, steel construction fasteners, European standard washers, hardened washers, bolt and nut assemblies, bolted joint reliability.
Relations
- Effective Date
- 25-Feb-2015
- Effective Date
- 25-Feb-2015
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
Frequently Asked Questions
EN 14399-6:2015 is a standard published by the European Committee for Standardization (CEN). Its full title is "High-strength structural bolting assemblies for preloading - Part 6: Plain chamfered washers". This standard covers: This European Standard specifies, together with EN 14399 1 and EN 14399 2, hardened and tempered chamfered plain washers with chamfer intended for bolting assemblies with large series hexagon high-strength structural bolts and nuts with thread sizes from M12 to M36 inclusive. Washers according to this standard are not intended to be used in direct contact with oversized or slotted holes. NOTE Attention is drawn to the importance of ensuring that the washers are correctly used if satisfactory results are to be obtained. For recommendations concerning proper application, reference to EN 1090–2 is made.
This European Standard specifies, together with EN 14399 1 and EN 14399 2, hardened and tempered chamfered plain washers with chamfer intended for bolting assemblies with large series hexagon high-strength structural bolts and nuts with thread sizes from M12 to M36 inclusive. Washers according to this standard are not intended to be used in direct contact with oversized or slotted holes. NOTE Attention is drawn to the importance of ensuring that the washers are correctly used if satisfactory results are to be obtained. For recommendations concerning proper application, reference to EN 1090–2 is made.
EN 14399-6:2015 is classified under the following ICS (International Classification for Standards) categories: 21.060.30 - Washers, locking elements. The ICS classification helps identify the subject area and facilitates finding related standards.
EN 14399-6:2015 has the following relationships with other standards: It is inter standard links to EN 14399-6:2005/AC:2006, EN 14399-6:2005, EN ISO 10684:2004, EN 14399-1:2015, EN ISO 3269:2019, EN ISO 4759-3:2016, EN 14399-10:2018, EN 14399-10:2009, EN 17293:2020, EN 14399-9:2018, EN 14399-4:2015, EN 14399-8:2007, EN 14399-7:2007, EN 14399-1:2005, EN 14399-7:2018. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN 14399-6:2015 is associated with the following European legislation: EU Directives/Regulations: 97/23/EC. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
EN 14399-6:2015 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)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.SRGORåNHHochfeste vorspannbare Garnituren für Schraubverbindungen im Metallbau - Teil 6: Flache Scheiben mit FaseBoulonnerie de construction métallique à haute résistance apte à la précontrainte - Partie 6: Rondelles plates chanfreinéesHigh-strength structural bolting assemblies for preloading - Part 6: Plain chamfered washers21.060.30Podložke, varovalni elementiWashers, locking elementsICS:Ta slovenski standard je istoveten z:EN 14399-6:2015SIST EN 14399-6:2015en,fr,de01-maj-2015SIST EN 14399-6:2015SLOVENSKI
STANDARDSIST EN 14399-6:2005/AC:2006SIST EN 14399-6:20051DGRPHãþD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 14399-6
February 2015 ICS 21.060.30 Supersedes EN 14399-6:2005English Version
High-strength structural bolting assemblies for preloading - Part 6: Plain chamfered washers
Boulonnerie de construction métallique à haute résistance apte à la précontrainte - Partie 6 : Rondelles plates chanfreinées
Hochfeste vorspannbare Garnituren für Schraubverbindungen im Metallbau - Teil 6: Flache Scheiben mit Fase This European Standard was approved by CEN on 18 October 2014.
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 CEN-CENELEC Management Centre 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 CEN-CENELEC Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.
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