SIST EN ISO 8742:2026

Overview

SIST EN ISO 8742:2026, published by CEN, specifies the characteristics and requirements for grooved pins featuring one-third-length center oval grooves with closed ends. These fasteners are manufactured in steel and stainless steel, suitable for nominal diameters from 1 mm to 25 mm. The standard ensures that grooved pins are designed to allow for the relative rotation of assembled parts, precise positioning or guiding, and efficient installation due to their symmetrical shape. Medium pull-out resistance is achieved through the elastic fit behavior inherent to the pin’s design. General principles and assembly requirements are further detailed in ISO 13669.

Key Topics

• Product Scope: Covers grooved pins with one-third-length center grooves, catering to a diverse range of nominal diameters and material grades, including steel and multiple grades of stainless steel (A2, A4, C1, F1).
• Functional Performance: Designed for:
  • Facilitating relative rotation between assembled components
  • Positioning and guiding applications where precise alignment is critical
  • Ensuring moderate resistance to removal due to the elastic interference fit
• Design Attributes:
  • Symmetrical and closed-ended grooves allow for easy, bi-directional installation
  • Standardized options for rounded or chamfered ends based on application needs
• Dimensions and Tolerances: Strictly defined for consistency in performance and interchangeability across various industrial uses. The standard includes detailed tolerances for grooving and pin straightness.
• Surface Condition and Marking: Outlines acceptable finishing processes, including electroplated coatings, passivation, and labeling on packaging for clear identification and traceability.

Applications

Grooved pins specified under SIST EN ISO 8742:2026 are widely used in mechanical engineering, manufacturing, and assembly operations where reliable alignment and rotational movement are required. Typical applications include:

• Automotive assemblies: Used as locating and guiding pins in gearboxes, axles, and subassemblies.
• Machinery and equipment: For precise positioning of parts, hinges, levers, and articulated systems.
• Fixtures and jigs: Serve as robust reference points in manufacturing tooling.
• Appliances and consumer goods: Where parts require alignment but occasional disassembly or rotation is necessary.
• Electronics and electrical devices: In assemblies where non-permanent, yet secure, connections are preferred.

The standard’s medium pull-out resistance is ideal for situations where pins need to resist moderate axial forces but can be conveniently installed or replaced without specialized equipment.

Related Standards

The following international standards provide complementary or alternative specifications for grooved pins and associated fasteners:

• ISO 13669: General requirements and functional principles for grooved pins and their assembly.
• ISO 13670: Reverse-taper grooved pins - one quarter-length progressive grooves.
• ISO 8739, ISO 8740, ISO 8741, ISO 8743 - ISO 8747: Cover various designs of grooved pins, including full-length and half-length grooves, different head styles, and other geometries.
• ISO 3506-6: Mechanical properties of corrosion-resistant stainless steel fasteners.
• ISO 4042, ISO 10683, ISO 9717: Standards for coatings and surface treatments.
• ISO 3269: Acceptance inspection for fastener quality assurance.
• ISO 1891-4: Vocabulary and protocols for control, inspection, and identification of fasteners.
• ISO 16048: Passivation of stainless-steel fasteners.

Practical Value

SIST EN ISO 8742:2026 helps manufacturers, engineers, and quality professionals ensure the interchangeability, functional performance, and traceability of grooved pins within a global supply chain. Adhering to this standard simplifies procurement, enhances assembly reliability, and reduces the risk of misalignment or premature wear in critical applications. The use of harmonized dimensions and tolerances also supports cost-effective manufacturing and streamlined maintenance across industries.