ISO 8740:2025

Overview

ISO 8740:2025, Fasteners - Parallel grooved pins, with chamfer point - Full-length diamond grooves, is an international standard developed by ISO for specifying the characteristics of parallel grooved pins made from steel and stainless steel. This standard covers grooved pins with nominal diameters ranging from 1 mm to 25 mm and details their dimensions, materials, surface finishes, and labelling requirements. The pins are characterized by full-length diamond grooves and chamfer points, providing reliable locking and ease of installation, suitable for assembling two or more parts with high pull-out resistance.

Key Topics

• Pin Characteristics: Defines parallel grooved pins with chamfer points and full-length diamond grooves (open-ended) in both steel and stainless steel.
• Dimensional Range: Covers nominal diameters from 1 mm up to 25 mm, including specific provisions for non-preferred diameters.
• Material and Finish Options:
  • Steel (St)
  • Stainless steel grades A1, A2, A4, C1, F1
  • Potential for other materials (e.g., brass, aluminium) upon agreement
  • Surface treatments: as processed, clean/bright, electroplated coatings, phosphate conversion, and other finishes as specified
• Ease of Installation: The chamfer point allows for smooth insertion, reducing assembly effort and potential damage.
• High Pull-Out Resistance: Full-length diamond grooves create an elastic fit, locking parts together securely.
• Packaging and Labelling: Specifies detailed labelling including size, material, finish, manufacturer, lot number, and quantity for consistent quality and traceability.

Applications

ISO 8740:2025 parallel grooved pins are essential fastening components used across industries such as:

• Mechanical Engineering: Securing assemblies where two or more parts need robust joining with easy assembly and disassembly.
• Automotive Manufacturing: Locking elements in components requiring vibration resistance and durable connections.
• Electronics and Instrumentation: Where precise alignment and secure connections are critical.
• Construction and Metalworking: Reliable connections for structural and non-structural components.

Typical use cases include:

• Locating and locking two or more components together
• Providing shear strength and alignment in mechanical assemblies
• Applications demanding easy installation and high pull-out resistance due to the pin’s elastic fit

Related Standards

ISO 8740:2025 integrates with a broad framework of fastener standards relevant to grooved pins and their applications:

• General Requirements: ISO 13669 - Grooved pins - General requirements (covers functional principles, assembly, and inspection)
• Material Grades: ISO 3506-6 - Mechanical properties of corrosion-resistant stainless steel fasteners
• Surface Treatments:
  • ISO 4042 - Electroplated coating systems
  • ISO 9717 - Phosphate conversion coating
  • ISO 10683 - Zinc flake coating systems
  • ISO 16048 - Passivation for corrosion-resistant stainless steel
• Labelling and Inspection:
  • ISO 1891-4 - Vocabulary and quality inspection terms
  • ISO 3269 - Acceptance inspection requirements

Further related product standards in the ISO 8739 to ISO 8747 series address pins with various groove lengths and end features, making ISO 8740 part of a comprehensive approach to fastener standardization.

Keywords: ISO 8740:2025, parallel grooved pins, full-length diamond grooves, chamfer point, steel pins, stainless steel pins, fastener standards, high pull-out resistance, mechanical fasteners, grooved pin assembly, international standard, ISO fasteners, industrial fasteners, fastening solutions.