Overview
ISO 4027:2003 is an International Standard that specifies the characteristics of hexagon socket set screws with cone point for metric threads from M1,6 up to and including M24, manufactured to product grade A. The standard defines dimensional requirements, tolerance references, material and mechanical-property linkages, gauging notes, surface and finish references, and a recommended designation format for procurement and acceptance.
Key topics and technical requirements
- Scope and sizing: Covers hexagon socket set screws with cone point for nominal threads M1,6–M24 and product grade A.
- Dimensions and sockets: Dimensional values (see Figure 1 / Table 1 in the standard) set socket geometry, point angle (120° or 90° depending on length), nominal lengths and related limits.
- Threading and tolerances: Thread form and limits referenced to ISO 261, ISO 965‑2 and ISO 965‑3 (general-purpose metric threads and tolerances).
- Material and mechanical properties:
- Carbon and alloy steels: refer to ISO 898‑5 for set screws not under tensile stress.
- Stainless steel: refer to ISO 3506‑3.
- Non‑ferrous metals: refer to ISO 8839.
- Product tolerances and acceptability: Product grade and dimensional tolerances referenced to ISO 4759‑1; acceptance inspection per ISO 3269.
- Surface, finish and coatings:
- Gauging: Combined gauging of hexagon sockets per ISO 23429.
- Designation example: Hexagon socket set screw ISO 4027 - M6×12 - 45H (illustrates format: standard – thread×length – property class).
Applications and users
ISO 4027 is intended for anyone specifying, producing, inspecting or procuring metric hexagon socket set screws with cone point. Typical users include:
- Fastener manufacturers and tooling suppliers (production and tolerancing)
- Design and mechanical engineers specifying set screws for assemblies
- Quality inspectors and laboratory personnel performing acceptance checks
- Purchasing and procurement teams using the standard designation in contracts and BOMs
- OEMs in machinery, instrumentation and general industrial assembly where cone‑point set screws locate or secure components without through‑tension
Related standards
ISO 4027 references and works with multiple ISO documents for a complete specification chain:
Using ISO 4027:2003 ensures consistent dimensions, interchangeability and clear procurement/design communication when specifying metric cone‑point hexagon socket set screws.
