ISO 13669:2025

Overview

ISO 13669:2025 - Fasteners - Grooved pins - General requirements defines the general characteristics, functional behavior and basic requirements for grooved pins made of steel and stainless steel with nominal diameters 1 mm to 25 mm. The standard covers geometry (ends, groove shapes), dimensional tolerances, expanded diameter requirements, assembly principles, mechanical properties (shear, hardness), inspection, marking and labelling. ISO 13669 is intended to ensure reliable elastic-fit locking, positioning/guiding and controlled relative rotation of assembled parts.

Key topics and technical requirements

• Scope: Grooved pins with three longitudinal grooves at 120° intervals producing an expanded diameter that provides elastic interference fit.
• Shapes and ends: Standard symbols and options for pin ends (rounded RN, chamfered CH, pilot PRN/PCH), groove ends (open/closed) and groove shapes (diamond D, oval O, progressive P).
• Expanded diameter (d2): Minimum expanded-over-hole clearances specified for steel pins (examples):
  • d = 1 mm: (d2 − dh) ≥ 0.04 mm
  • 1 mm < d ≤ 3.5 mm: ≥ 0.05 mm
  • 3.5 mm < d ≤ 18 mm: ≥ 0.10 mm
  • 18 mm < d ≤ 25 mm: ≥ 0.15 mm
  • Values for stainless steel and full rounding rules are defined in the standard.
• Hole dimensions and assembly: Tableed hole diameters for dh (nominal 1–25 mm) and guidance to use chamfered holes; coated pins require increased hole diameter to accommodate coating thickness.
• Functional factors: Insertion and pull-out forces depend on hole tolerance, groove shape (diamond gives higher resistance than oval/progressive), compressed groove length, and mating-part material/hardness.
• Mechanical/inspection: Requirements and methods for shear resistance, hardness testing (Vickers referenced), straightness control, and inspection levels (manufacturer, supplier, purchaser).
• Marking and labelling: Minimum requirements for pin marking and package labelling to support traceability.

Practical applications and users

• Who uses the standard: Fastener manufacturers, design and mechanical engineers, quality/inspection teams, procurement/specification writers and OEMs that assemble components using grooved pins.
• Typical applications: Locating and locking components, guiding or positioning assemblies, enabling controlled rotation between parts where a resilient interference fit is required.
• Practical advice from the standard: Consult experienced pin manufacturers for non-steel materials, non-cylindrical or molded holes, automatic assembly, misalignment conditions, or special coatings.

Related standards

• Normative and referenced documents include ISO 1891-4, ISO 6507-1, ISO 8749, ISO 16228, and product standards such as ISO 8739–ISO 8747, ISO 13670, ISO 13672. These cover vocabulary, hardness testing, shear tests, inspection documents and product-specific tolerances.

Keywords: ISO 13669, grooved pins, fasteners, expanded diameter, elastic fit, steel pins, stainless steel pins, groove shapes, assembly, insertion force, pull‑out force.