Overview
EN ISO 14582:2013 (ISO 14582:2013) specifies hexalobular (Torx-style) socket countersunk head screws with a high head (full loadability). The standard covers metric thread diameters from M3 up to and including M10, for product grade A fasteners in property classes 4.8, 8.8 and 10.9. It defines head geometry, gauging, thread and length conventions, marking and designation rules, and references applicable tolerance, mechanical and coating standards.
Key topics and technical requirements
- Scope and purpose: Standardizes hexalobular internal drive countersunk screws with increased head height to achieve full loadability in line with ISO 898-1 mechanical properties.
- Dimensions and head gauging: Detailed dimensional tables and figures define head geometry, socket sizes and a flushness gauge for control of head seating and countersink fit.
- Thread and tolerances:
- Thread range: M3–M10
- Tolerance class: 6g
- Thread standards: ISO 261 and ISO 965-2 referenced for thread profiles and limits.
- Mechanical properties: Acceptable property classes 4.8, 8.8, 10.9 with mechanical requirements per ISO 898-1.
- Product grade and acceptability: Product grade A and acceptance inspection per ISO 3269; surface discontinuity limits per ISO 6157-1.
- Marking and designation: Screws M5 and above may be marked per ISO 898-1; example designation format provided (e.g., Countersunk head screw ISO 14582 - M10 × 40 – 10.9).
- Finishes and coatings: References for electroplating, zinc flake and hot-dip galvanizing: ISO 4042, ISO 10683, ISO 10684.
- Interchangeability note: Because of increased head height, these screws are not fully interchangeable with common ISO countersunk screws; assemblies may require a slightly deeper countersink than ISO 15065.
Applications and who uses this standard
EN ISO 14582:2013 is used by:
- Fastener manufacturers for product design, production tolerances and quality control.
- Design and mechanical engineers specifying secure, flush fastenings with internal hexalobular drives where higher load capacity is needed.
- Procurement and quality assurance teams for supplier acceptance, marking and inspection procedures.
- Typical applications include automotive, machinery, electronics and precision assemblies where a flush countersunk appearance plus enhanced mechanical performance is required.
Related standards
Key normative references and related standards:
For engineers and procurement specialists searching for “EN ISO 14582:2013”, “hexalobular socket countersunk head screws high head”, or “ISO 14582 fasteners”, this standard provides the authoritative dimensional, mechanical and inspection requirements for high-head hexalobular countersunk screws.