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This International Standard specifies the characteristics of round head grooved pins which have three equally spaced grooves impressed longitudinally on their exterior surface, with nominal diameter, d₁, from 1,4 mm to 20 mm inclusive.

The displaced material to each side of the grooves forming an expanded diameter, d₂, which is larger than the nominal diameter d₁ will cause a non-positive locking fit when these grooved pins are forced into a drilled hole equal to the nominal diameter d₁ (see clause 4).