Overview
ISO 14583:2011 defines the characteristics and dimensional requirements for hexalobular socket pan head screws (commonly known as Torx® pan head screws) of product grade A with metric thread sizes M2 to M10. This International Standard (second edition, 2011) replaces the 2001 edition and sets the baseline for geometry, tolerances, material options and designation for these fasteners.
Key topics and requirements
- Scope and product grade: Covers hexalobular socket pan head screws, product grade A, thread sizes M2–M10.
- Dimensions and form: Head, shank and socket geometry are specified (see Figure 1 and Table 1 of ISO 14583). The standard provides nominal head and socket dimensions and reference masses for carbon steel screws.
- Threads and tolerances: Threads follow metric standards (ISO 261 and ISO 965-2) with tolerance class 6g. Thread lengths and nominal lengths reference ISO 888.
- Materials and mechanical properties: Permits steel, stainless steel (e.g., A2-70, A3-70), and non‑ferrous metals. Mechanical-property references include ISO 898-1 (carbon/alloy steel), ISO 3506-1 (stainless steel) and ISO 8839 (non‑ferrous). Example designation includes property class 4.8.
- Hexalobular socket acceptance: Socket form and gauges are referenced to ISO 10664.
- Coatings and finishes: Electroplating per ISO 4042 and zinc‑flake coatings per ISO 10683. Surface discontinuities and acceptability reference ISO 6157‑1 and ISO 3269 for acceptance inspection.
- Designation: Standardized example - “Hexalobular socket pan head screw ISO 14583 - M5 × 20 - 4.8”.
Applications and who uses this standard
ISO 14583:2011 is used by:
- Fastener manufacturers for design, production and quality control of hexalobular pan head screws.
- OEMs and component designers specifying assembly hardware for electronics, automotive subassemblies, industrial machinery and consumer products where compact pan heads and hexalobular drive features are required.
- Procurement and inspection teams to verify compliance, coatings and acceptance criteria.
- Test labs and certification bodies referencing material/property classes and inspection standards.
Practical benefits include ensuring interchangeability, consistent drive geometry (hexalobular socket), predictable mechanical behavior when combined with specified property classes, and compatibility with standard coatings and inspection regimes.
Related standards
Keywords: ISO 14583:2011, hexalobular socket pan head screws, M2 to M10, product grade A, hexalobular socket, fastener standards, ISO 10664.
