ISO 13670:2025, Fasteners — Reverse-taper grooved pins — One quarter-length progressive grooves on both sides

This document specifies the characteristics of reverse-taper grooved pins with one quarter-length progressive grooves on both sides (with closed ends), in steel and stainless steel, and with nominal diameters 2 mm to 25 mm.

These grooved pins are designed to fulfil the main following functions:

— relative rotation of the assembled parts,
— locking of two (or more) parts

with an easy installation (due to its symmetrical shape) and a medium level of pull-out resistance (due to the elastic fit behaviour of the pin).

The general requirements (including functional principles for grooved pins and assembly) are specified in ISO 13669.