Overview
ISO 8742:2026, titled Fasteners - Grooved pins - One-third-length center grooves, specifies the characteristics and requirements for grooved pins with one-third-length centre oval grooves (with closed ends). Applicable to both steel and stainless steel pins with nominal diameters from 1 mm to 25 mm, this international standard focuses on grooved pins designed for straightforward installation and moderate pull-out resistance. The symmetrical design and controlled groove length provide flexibility for a variety of mechanical applications, ensuring proper alignment and relative rotational movement between assembled parts.
The general requirements and assembly principles for these types of grooved pins are detailed in the reference standard ISO 13669. ISO 8742:2026 is an essential resource for manufacturers, engineers, and procurement professionals working with fastener components in various industries.
Key Topics
- Specification Scope: Defines pin dimensions, tolerances, and materials, focusing on pins with one-third-length closed-centre grooves.
- Materials: Covers both steel (St) and stainless steel variants (A1, A2, A4, C1, F1), with options for other materials upon agreement.
- Dimensional Requirements: Includes explicit tolerances for length, expanded diameter, groove location, and end configuration (rounded or chamfered ends).
- Installation and Fit: Emphasizes easy assembly due to the symmetrical shape, and medium pull-out resistance attributed to the elastic fit of the grooves.
- Surface Conditions: Specifies options such as as-processed, clean and bright, electroplated coatings, zinc flake coating, phosphate conversion, or customized finishes.
- Labelling and Identification: Details mandatory package labelling elements for product traceability and correct identification.
- Quality and Acceptance: Refers to inspection criteria and acceptance requirements for batch and product quality control.
Applications
ISO 8742:2026 applies to a broad range of mechanical assembly contexts where reliable fastening and precise alignment are required. Practical applications include:
- Mechanical Engineering: Positioning and guiding of parts that may require moderate rotational movement or alignment adjustment.
- Automotive and Transportation: Use in assemblies that benefit from easy installation and moderate retention strength.
- Electronics and Appliance Manufacturing: Fastening components where removable or adjustable pins are necessary.
- General Machinery: As positioning, pivot, or guide pins in fixtures, sub-assemblies, or joining mechanical parts.
The one-third-length center grooves distinguish these pins from other types by allowing controlled expansion during insertion, supporting both positioning and rotational functions while mitigating risks of excessive pull-out or over-compression.
Related Standards
ISO 8742:2026 references a number of other key international standards in the fastener industry for terminology, material selection, testing, and surface treatment. Notable related standards include:
- ISO 13669: General requirements for grooved pins, covering functional and dimensional principles.
- ISO 3506-6: Mechanical properties and material grades for corrosion-resistant stainless steel fasteners.
- ISO 4042: Electroplated coating systems for fasteners.
- ISO 10683: Non-electrolytically applied zinc flake coatings.
- ISO 9717: Phosphate conversion coating of metals.
- ISO 1891-4, ISO 3269: Terminology, inspection, and acceptance requirements for fasteners.
- Other related product standards: ISO 8739, ISO 8740, ISO 8741, ISO 8743, ISO 8744, ISO 8745, ISO 8746, ISO 8747 (covering various grooved pin types).
When selecting or specifying grooved pins, it is important to consider these related standards to ensure compatibility, performance, and regulatory compliance in your application.
For more information and related documentation, visit the ISO website or consult ISO member bodies worldwide.
