EN ISO 8744:2025 PDF

Overview

EN ISO 8744:2025 - Fasteners: Taper grooved pins with full-length progressive grooves specifies the characteristics of taper grooved pins (closed end at the insertion side) made in steel and stainless steel, with nominal diameters from 1 mm to 25 mm. These taper grooved pins are intended to lock together two or more parts with easy installation and high pull-out resistance thanks to the pin’s elastic-fit behaviour. EN ISO 8744:2025 was prepared by ISO/TC 2 in collaboration with CEN/TC 185 and supersedes EN ISO 8744:1997.

Key topics and technical requirements

• Scope and geometry
  • Taper grooved pins with full-length progressive grooves; three grooves that remain closed at the rounded/chamfered insertion end and open at the opposite end.
  • Pin end options: rounded (RN) by default; chamfered (CH) by request.
• Dimensions and tolerances
  • Nominal diameters: 1 mm to 25 mm; detailed lengths and expanded diameter data are provided in Tables 1 and 2.
  • Expanded diameter (d) and pin straightness (t) control requirements reference ISO 13669.
  • Tolerances for rounded ends and chamfered ends added in this edition.
• Materials and grades
  • Steel (symbol St) and stainless steels, including added grades A2, A4, C1, F1.
  • Other materials (hardened steels, brass, aluminium) allowed by agreement with manufacturer.
• Mechanical and inspection requirements
  • Mechanical, physical and inspection requirements are linked to ISO 13669 and other referenced standards; coatings and surface treatments follow ISO 4042, ISO 10683, ISO 9717 where applicable.
• Labelling and designation
  • Packaging and labelling specifications are added (Clause 8) to support traceability and procurement.

Applications

• Primary function: locking and locating components in assemblies where a secure press-fit and resistance to pull-out are required.
• Typical application areas include mechanical assemblies, general machinery, tooling, and any engineering context requiring simple installation combined with high retention.
• The tapered, grooved design is suited where elastic deformation of the pin improves joint reliability.

Who uses this standard

• Fastener manufacturers and product designers specifying taper grooved pins
• Procurement and quality assurance teams verifying conformance to EN ISO 8744:2025
• Mechanical, design and assembly engineers requiring dimensional, material and inspection guidance
• Test and inspection laboratories applying acceptance criteria

Related standards

• ISO 13669 - Grooved pins - General requirements (functional principles, hole dimensions, control of expanded diameter and straightness)
• ISO 3506-6, ISO 4042, ISO 10683, ISO 9717, ISO 1891‑4, ISO 3269
• Other product standards in the ISO 8739–8747 series

EN ISO 8744:2025 provides the dimensional, material and inspection framework engineers and manufacturers need for consistent, reliable use of taper grooved pins across industries.