Overview
EN ISO 4026:2026 specifies the characteristics of hexagon socket set screws with flat point, widely used in mechanical engineering and assembly applications. This European and international standard, approved by CEN and ISO, defines requirements for set screws with metric coarse pitch threads ranging from M1.6 to M30 for steel and M1.6 to M24 for stainless steel, all of product grade A. These set screws are designed for clamping or positioning components and are not intended for use under tensile load. The standard outlines dimensional, mechanical, and labeling requirements, ensuring compatibility and interchangeability across industries.
Key Topics
- Scope of Application: Covers hexagon socket set screws with flat point, with detailed specifications for size range and applicable materials (steel and stainless steel).
- Product Grade A: Ensures high-quality fasteners for precision engineering.
- Thread Sizes: Metric coarse pitch threads from M1.6 to M30 (steel) and M1.6 to M24 (stainless steel).
- Material and Hardness Classes: References ISO 898-5 for carbon and alloy steel and ISO 3506-3 for stainless steel. Different hardness classes and grades are selectable based on application requirements.
- Dimensional Requirements: Specifies screw lengths, thread dimensions, hexagon socket dimensions, and flat point geometry according to referenced ISO standards.
- Surface Condition and Coatings: Requirements for as-processed, clean and bright, passivated, or coated finishes depending on material and agreement between purchaser and supplier.
- Tolerances and Inspection: Specifies tolerances as per ISO 4759-1 and acceptance inspection in accordance with ISO 3269.
- Marking and Labelling: Packaging must be labeled with key attributes such as reference standard, thread size, length, hardness class or grade, surface condition, manufacturer/distributor, and lot number.
Applications
Hexagon socket set screws with flat point are essential in numerous assembly and positioning tasks where components must be held together or securely located. Typical applications include:
- Mechanical assemblies: Securing collars, gears, and pulleys onto shafts.
- Precision engineering: Used in devices or fixtures requiring non-protruding screw heads.
- Industrial machinery: Commonly installed in equipment where minimal surface interruption is critical.
- Automotive and aerospace: Positioning parts without applying tensile load.
- Electronics and instrumentation: When securing sensitive or small-scale components.
The availability of various sizes and materials allows these screws to be used across different sectors, optimizing design flexibility while maintaining standardization and quality.
Related Standards
To ensure complete compliance and optimal selection of set screws, EN ISO 4026:2026 is used in conjunction with several related standards, including:
- ISO 898-5: Mechanical properties of set screws and similar threaded fasteners made of carbon steel and alloy steel.
- ISO 3506-3: Mechanical properties and grade selection for stainless steel set screws.
- ISO 4759-1: Tolerances for fasteners, detailing permissible manufacturing deviations.
- ISO 4042 & ISO 10683: Guidelines for surface coatings, including electroplated and zinc flake systems.
- ISO 888: Guidance on nominal lengths.
- ISO 965-1: Thread tolerances and basic data.
- ISO 8991 & ISO 8992: General requirements and standardized designation systems for fasteners.
- ISO 3269: Acceptance inspection requirements.
EN ISO 4026:2026 replaces previous versions (such as EN ISO 4026:2003), ensuring up-to-date criteria for designers, manufacturers, and users of hexagon socket set screws with flat point. Adopting this standard supports quality assurance, international interchangeability, and compatibility in fastener selection.
