Overview
EN ISO 7047:2011 (ISO 7047:2011) defines the characteristics of raised countersunk head screws (common head style) of product grade A. The standard covers screws with metric threads from M1.6 to M10 inclusive and specifies the two supported cross recess forms: type H and type Z. It is intended to ensure interchangeability, consistent quality and clear designation of small metric countersunk screws used across industry.
This edition supersedes earlier versions and aligns the European adoption (EN ISO 7047:2011) with the international text prepared by ISO/TC 2 "Fasteners". The document includes dimensional tables, head and recess geometry, designation examples and references to related normative documents for materials, coatings and inspection.
Key Topics
- Scope and product grade: Screws covered are product grade A, with threads M1.6–M10 and cross recess type H or Z.
- Dimensions and tolerances: Detailed head and screw dimensions are provided (see figure and Table 1 in the standard). Threading and limits follow ISO general-purpose metric thread rules.
- Materials and property classes: The standard references suitable material/property specifications (for example, steel property class 4.8 and stainless alternatives such as A2-50, A2-70 where applicable).
- Surface finishes and coatings: Electroplated coatings, passivation for stainless steels and non-electrolytically applied zinc flake coatings are covered by referenced standards to manage corrosion protection and appearance.
- Acceptance and surface integrity: Inspection, acceptability criteria and limits for surface discontinuities are defined by referenced ISO documents to ensure quality control.
- Designation: Example designation format is provided (e.g. "Countersunk raised head screw ISO 7047 - M5 × 20 - 4.8 - Z").
Applications
EN ISO 7047 screws are used where a low-profile countersunk head with a common cross recess is required and where consistent interchangeability and specification compliance matter. Typical applications include:
- Electronics and precision assemblies
- Consumer appliances and hardware
- Small mechanical assemblies in automotive and industrial equipment
- Fastening where flush or near-flush head profiles are required for aesthetic or functional reasons
Using EN ISO 7047 helps purchasers and manufacturers specify screws with predictable fit, mechanical properties and finishing options for reliable assembly and corrosion performance.
Related Standards
Key referenced standards (normative) in EN ISO 7047 include:
For procurement, design and quality teams, referencing EN ISO 7047:2011 ensures compatibility with international fastener practices and simplifies supplier communication on small countersunk screw requirements.
