Overview - EN 28738:1992 (Plain washers for clevis pins, Product grade A)
EN 28738:1992 adopts ISO 8738:1986 and specifies requirements for plain washers for clevis pins - product grade A. The standard defines the characteristics of washers manufactured in accordance with the related ISO documents (notably ISO 2340 and ISO 2341), covers nominal sizes from 3 mm up to and including 100 mm, and includes references to international standards. It also provides an example for product designation to support clear identification in procurement and documentation.
Key topics and technical requirements
- Scope and applicability: Washers designed specifically for use with clevis pins; intended to standardize form and designation for Product Grade A items.
- Reference standards: Requirements are specified with direct reference to ISO 2340 and ISO 2341, and the adoption is consistent with ISO 8738:1986.
- Nominal sizes covered: All sizes from 3 mm to 100 mm are included within the standard’s scope.
- Product designation: The standard supplies an example for how washers should be designated to ensure unambiguous ordering and record-keeping.
- Conformity and documentation: Guidance on how products conforming to the standard should be described and identified in technical documentation and procurement.
- Classification: Establishes the product grade A level and its relationship to the relevant ISO definitions.
(Note: EN 28738:1992 references ISO documents for detailed dimensional and material characteristics. For exact dimensions, tolerances, and material specifications consult ISO 2340, ISO 2341 and ISO 8738:1986.)
Applications - who uses this standard
- Manufacturers of washers and fastener components to ensure consistent product grade and interchangeability.
- Design engineers specifying clevis-pin assemblies in machinery, agricultural equipment, automotive linkages, lifting and rigging systems, and general mechanical applications.
- Purchasing and procurement teams using standardized designation to avoid ambiguity in orders.
- Quality assurance and test laboratories that verify compliance with international references and product grade requirements.
- Standards bodies and technical committees aligning national specifications with European and ISO norms.
Related standards
This standard simplifies specification and procurement of plain washers for clevis pins, ensuring compatibility, traceability, and consistent quality across applications where clevis-pin connections are used.