EN ISO 4027:2026 PDF

Overview

EN ISO 4027:2026 specifies the characteristics and requirements for hexagon socket set screws with truncated cone point, focusing on metric coarse pitch threads for both steel (M1.6 to M30) and stainless steel (M1.6 to M24) fasteners in product grade A. This standard, developed by CEN and aligned with ISO 4027:2026, establishes technical parameters, dimensional criteria, marking, and labelling requirements for these widely used fastening elements. The scope emphasizes that these set screws are not designed for applications involving tensile loading. Optional mechanical properties, material grades, and dimensions can be selected in reference to other established international standards as needed for specialized use.

Key Topics

• Product Range

  • Metric coarse threads: from M1.6 up to M30 for steel, and up to M24 for stainless steel fasteners.
  • Product grade A for quality assurance and interchangeability.

• Design & Construction

  • Hexagon socket to allow for secure tool engagement.
  • Truncated cone point for precise and reliable location in assembly.
  • Set screws are intended for securing parts together through friction rather than bearing tensile loads.

• Material and Hardness Classes

  • Selection from ISO 898-5 for steel set screws.
  • Selection from ISO 3506-3 for stainless steel grades and hardness classes.
  • Reference to ISO 888, ISO 965-1, or ISO 4753 for alternative dimensions.

• Marking and Labelling

  • No mandatory product marking unless agreed upon.
  • Package labelling must include standard reference, size and length, hardness class or grade, surface condition, manufacturer info, lot number, and quantity.

Applications

Hexagon socket set screws with truncated cone point are essential in a range of mechanical and industrial settings where compact, reliable, and easily adjustable fastening is required. Typical applications include:

• Securing Components on Shafts: Used in gears, pulleys, and collars on rotating shafts to prevent movement or slipping.
• Electrical and Electronic Assemblies: Beneficial in assembling bus bars, circuit elements, or terminal connections.
• Machine Tools and Fixtures: Provide precise clamping without surface marring, useful in jigs and fixtures for repeatable setups.
• General Mechanical Engineering: Ensure components stay in fixed positions during operation where accessible, discreet fastening is important.

Because these set screws are not intended for tensile load applications, they are most suitable where the principal force is lateral or where position retention is critical rather than structural strength.

Related Standards

EN ISO 4027:2026 references and can be used in conjunction with several international fastener standards, enhancing versatility and compliance in different use cases:

• ISO 898-5: Mechanical properties for steel set screws and similar fasteners.
• ISO 3506-3: Mechanical properties and grades for stainless steel set screws.
• ISO 888: Standard for fastener lengths and thread lengths.
• ISO 965-1: Tolerances for ISO metric screw threads.
• ISO 4753: Definitions related to ends of externally threaded parts.
• ISO 8991 / ISO 8992: Designation system and general requirements for fasteners.
• ISO 4042 / ISO 10683: Surface treatment and coating standards for fasteners.
• ISO 4759-1: Product tolerances for screws, bolts, and nuts.
• ISO 6157-1: Requirements for surface discontinuities.
• ISO 3269: Acceptance inspection for fasteners.

By adhering to EN ISO 4027:2026, manufacturers and users ensure compatibility, safety, and performance in global supply chains for mechanical fastening solutions. This standard supports efficient procurement, clear communication, and consistent quality, crucial for industrial assembly, maintenance, and repair operations.