Overview
ISO 7047:2011 defines the dimensional and product requirements for raised countersunk head screws (common head style) with a type H or type Z cross recess, classified as Product grade A. Published as the third edition in 2011, the standard covers metric threaded screws with nominal thread sizes M1,6 to M10 inclusive and includes dimensional tables, permissible tolerances and references to related fastener standards.
Key topics and requirements
- Scope: Characteristics for raised countersunk head screws, threads M1,6–M10, cross-recess types H or Z; product grade A.
- Dimensions and tolerances: Detailed dimensions (head geometry, shank, nominal lengths, thread engagement and recess penetration) are given in the standard’s Figure 1 and Table 1. Tolerance class for threads is 6g.
- Mechanical and material requirements: Mechanical properties and property classes are specified by cross-reference to ISO standards (e.g., ISO 898-1 for carbon/alloy steels; ISO 3506-1 for stainless steels). Typical property classes referenced include 4.8, A2‑50, A2‑70.
- Cross recess specification: Recess form and dimensions are referenced to ISO 4757 (cross recesses for screws) including penetration depths for types H and Z.
- Finish, coatings and surface integrity: Electroplating requirements - ISO 4042; non-electrolytically applied zinc flake - ISO 10683; passivation for stainless steel - ISO 16048; surface discontinuity limits - ISO 6157-1.
- Acceptance and inspection: Acceptance inspection criteria are referenced in ISO 3269.
- Designation example: Countersunk raised head screw ISO 7047 - M5 × 20 - 4.8 - Z
Applications
ISO 7047 is used wherever consistent specification of small to medium metric countersunk raised-head screws is required:
- Engineering and product design for mechanical assemblies requiring flush or near-flush heads
- Fastener manufacturers and component suppliers producing to international tolerances
- Quality assurance and inspection teams verifying dimensional and surface requirements
- Procurement and specification writers in automotive, electronics, appliance and general machinery sectors
Who should use this standard
- Mechanical designers and specifiers requiring reliable thread/head geometry and recess compatibility
- Manufacturers and CNC/fastener shops producing or sourcing screws to international norms
- Test labs and QA inspectors performing acceptance checks
- Purchasing teams specifying finish, coating and mechanical property requirements
Related standards (selected)
Keywords: ISO 7047, raised countersunk head screws, cross recess H, cross recess Z, product grade A, metric screws, fastener standard, M1.6–M10.