Overview
EN ISO 898-3:2018/A1:2021 is a CEN-endorsed amendment to ISO 898-3 that updates the international requirements for flat washers made from carbon steel and alloy steel with specified property classes. Published as an EU/EN document in 2021 (ISO amendment issued 2020), this amendment harmonizes CEN national standards with the ISO text and makes targeted technical revisions without altering the original standard’s intent.
Key topics and technical changes
- Title update: The amendment adds the introductory element “Fasteners” to the document title so it reads: Fasteners - Mechanical properties of fasteners made of carbon steel and alloy steel - Part 3: Flat washers with specified property classes.
- Technical formula revision: Clause 8.1.2.2 includes a replacement of Formula (1). The revised formula expresses a relationship involving washer thickness (t) and Vickers hardness (HV_eff) to determine a characteristic load parameter (F). This indicates the standard uses hardness and geometry parameters in washer performance calculations.
- Editorial updates: A bibliographic footnote was removed in the amendment; the EN text is identical to ISO 898-3:2018/Amd 1:2020 as approved by CEN.
- Standards stewardship: The amendment was prepared by ISO/TC 2 (Fasteners) in collaboration with CEN/TC 185 and approved by CEN on 11 January 2021.
Applications and who uses it
This amendment (and the parent part 3) is used by:
- Fastener and washer manufacturers for product specification, testing and compliance
- Mechanical design and structural engineers specifying washers in bolted assemblies
- Quality assurance and materials testing laboratories that verify mechanical properties (e.g., hardness-based checks)
- Procurement and standards teams seeking harmonized EN/ISO requirements across European markets
- National standards bodies enforcing CEN adoption and withdrawal of conflicting national standards
Practical applications include ensuring washer compatibility with specified fastener property classes, verifying load-bearing behavior for bolted joints, and harmonizing part documentation for international trade.
Related standards
- ISO 898 series - other parts covering mechanical properties of fasteners (consult ISO for the full list)
- National EN adoptions and other CEN/CENELEC regulations that implement ISO amendments in Europe
Keywords: EN ISO 898-3:2018/A1:2021, ISO 898-3, flat washers, fasteners, mechanical properties, Vickers hardness, property classes, CEN amendment.
