This document specifies the characteristics of parallel grooved pins with half-length diamond grooves (with closed ends), in steel and stainless steel, and with nominal diameters 1 mm to 25 mm. These grooved pins are designed to fulfil the main following functions: positioning or guiding, and relative rotation of the assembled parts, with a more significant insertion force due to its shape and a high level of pull-out resistance due to the elastic fit behavior of the pin. The general requirements (including functional principles for grooved pins and assembly) are specified in ISO 13669.