Overview
ISO 13809:2026 establishes international requirements for fasteners known as hexalobular socket set screws. This standard covers characteristics specific to set screws with metric coarse pitch threads, with sizes ranging from M3 to M30 for steel and M3 to M24 for stainless steel, all corresponding to product grade A. Hexalobular socket set screws, also commonly called Torx® set screws, are widely used in mechanical and assembly applications for their superior drive capabilities and reduced risk of cam-out.
Notably, ISO 13809:2026 applies to set screws not intended for use under tensile loads. The standard provides guidance on the selection of hardness classes, stainless steel grades, and dimensional options by referencing additional ISO standards as needed.
Key Topics
Applications
Hexalobular socket set screws offer enhanced torque transfer and are valued for high assembly efficiency. They are commonly used in:
- Mechanical assemblies: Securing components on shafts, pulleys, or collars
- Electronics & instrumentation: Fixing knobs, sensors, or adjustment screws that require non-slip engagement
- Automotive, aerospace, and industrial equipment: Where precise clamping without protrusion is crucial, especially where repeated assembly/disassembly may occur
- Stainless steel variants provide corrosion resistance for marine, chemical, and medical equipment applications
The standardized sizes and thread forms support global supply interoperability, quality control, and compliance for manufacturers and end-users.
Related Standards
ISO 13809:2026 references and aligns with several major international standards to ensure harmonized requirements for dimensions, performance, and materials, including:
- ISO 898-5: Mechanical properties of steel set screws
- ISO 3506-3: Mechanical properties of stainless steel set screws
- ISO 888: Nominal lengths and thread lengths for fasteners
- ISO 965-1: Tolerances for ISO metric threads
- ISO 10664: Hexalobular internal driving features for bolts and screws
- ISO 4042 / ISO 10683: Surface coatings and finishes for fasteners
- ISO 4753: Configurations of screw ends
- ISO 8991 / ISO 8992: Designation and general requirements
For those specifying or sourcing hexalobular socket set screws, referencing ISO 13809:2026 helps ensure robust product selection, quality assurance, and compliance with globally recognized standards in fastener technology.