Overview
ISO 4029:2003 is the international standard that specifies the characteristics of hexagon socket set screws with cup point (cup-point, headless screws) for threads from M1.6 up to and including M24 and for product grade A. Published as the third edition in 2003, the standard covers dimensional data, designation, material and mechanical-property requirements, tolerances and basic acceptance criteria for these set screws used in general engineering and assembly.
Key topics and requirements
- Scope and product type: Defines hexagon socket set screws with a cup-shaped point (cup point) and headless design.
- Thread range: Covers metric threads from M1.6 to M24.
- Product grade: Specifies requirements for product grade A; tolerances follow ISO 4759-1.
- Dimensions and gauging: Provides dimensional tables and socket/point geometry details (see ISO 23429 for combined gauging of hexagon sockets).
- Materials and mechanical properties: References mechanical-property standards for:
- Thread tolerances and forms: Uses general-purpose metric thread definitions and tolerances per ISO 261, ISO 965-2 and ISO 965-3.
- Surface finish and coatings: Electroplating and coating requirements are covered by ISO 4042 (electroplated) and ISO 10683 (zinc flake coatings).
- Surface discontinuities and inspection: Limits and acceptability of surface defects per ISO 6157-1; acceptance inspection according to ISO 3269.
- Designation example: “Hexagon socket set screw ISO 4029 - M6×12 - 45H” (shows thread, length and property class).
Applications and users
- Used where a compact, flush, adjustable fastening is required - e.g., securing collars, gears, pulleys, or assemblies in machinery, instrumentation and electronics.
- Typical users:
- Fastener manufacturers and quality engineers
- Design and mechanical engineers specifying components
- Procurement and inspection teams ensuring conformity to international fastener standards
- Aerospace, automotive, industrial equipment and precision-assembly sectors
Related standards
Keywords: ISO 4029, hexagon socket set screws, cup point, set screws standard, M1.6–M24, product grade A, fastener dimensions, thread tolerances, mechanical properties.
