ISO 14586:2011

Overview

ISO 14586:2011 is an international standard published by the International Organization for Standardization (ISO) that specifies the dimensions, design, and mechanical properties of hexalobular socket countersunk head tapping screws. These screws have thread sizes ranging from ST2,9 to ST6,3 and are widely used in industrial and manufacturing applications where secure fastening with high torque capabilities is needed. This edition is a minor revision of the first 2001 edition, providing updated specifications and clarifications for enhanced standardization.

The standard ensures consistent quality and interoperability of these specialized tapping screws globally, supporting manufacturers, engineers, and quality inspectors in selecting and verifying screw products that meet international benchmarks.

Key Topics

• Screw Characteristics
  ISO 14586:2011 defines the critical features of hexalobular socket countersunk head tapping screws, including thread sizes, head dimensions, and socket specifications. These screws feature a hexalobular (six-lobe) internal driving socket enhancing torque transmission and reducing the risk of cam-out.

• Dimensions and Types
  The standard provides exact dimensions for screws from ST2,9 through ST6,3, detailing parameters such as pitch, head height, diameter, and socket size. Three head types (C, F, and R) are described, accommodating different design and assembly requirements.

• Material and Mechanical Properties
  These screws are manufactured primarily from heat-treated steel, as specified under ISO 2702, to ensure mechanical strength and durability. Product Grade A tolerances per ISO 4759-1 apply, guaranteeing consistent performance.

• Surface Finishes and Coatings
  Acceptable finishes include electroplating following ISO 4042 and non-electrolytical zinc flake coatings under ISO 10683. Additional surface treatments can be agreed upon between suppliers and purchasers for enhanced corrosion resistance or application-specific needs.

• Quality Assurance and Inspection
  ISO 14586 references acceptance inspection requirements from ISO 3269, ensuring screws meet dimensional and mechanical specifications before delivery.

• Designation Format
  The standard prescribes a clear designation format for these screws to aid identification and procurement, for example:
  Tapping screw ISO 14586 - ST3,5 × 16 - R.

Applications

Hexalobular socket countersunk head tapping screws covered by ISO 14586:2011 are commonly used in:

• Electronics Assembly – Ideal for fastening printed circuit boards and enclosures where a flush surface is critical.
• Automotive Industry – Used in dashboard assemblies and instrument panels requiring precise torque control.
• Machinery and Equipment Manufacturing – Provide strong, vibration-resistant fastening for metallic components.
• Furniture Production – Employed in assembling metal furniture parts where countersunk heads ensure smooth finishes.
• Consumer Electronics – Securing compact components where space and screw head profile matter.

The hexalobular socket design improves torque transfer and reduces wear on screwdriver tools, making these screws suitable for automated assembly processes and repeated maintenance cycles.

Related Standards

ISO 14586:2011 references several key international standards to ensure comprehensive standardization of tapping screws:

• ISO 1478 – Defines thread forms for tapping screws.
• ISO 2702 – Specifies mechanical properties for heat-treated steel tapping screws.
• ISO 4759-1 – Covers tolerances and product grades for bolts, screws, studs, and nuts.
• ISO 7721 – Details head configuration and gauging methods for countersunk head screws.
• ISO 10664 – Describes hexalobular internal driving features for bolts and screws.
• ISO 4042 – Requirements for electroplated coatings on fasteners.
• ISO 10683 – Standards for non-electrolytical zinc flake coatings.
• ISO 3269 – Acceptance inspection procedures for fasteners.

For special requirements outside ISO 14586’s scope, specifications from these standards can be applied flexibly to accommodate unique industrial needs.

ISO 14586:2011 offers a reliable, internationally recognized framework for the production, use, and inspection of hexalobular socket countersunk head tapping screws-a critical fastener type enhancing assembly integrity across multiple industries. Adhering to this standard assists manufacturers and engineers in ensuring product quality, compatibility, and performance excellence.