NEN EN ISO 10666 : 1999

Defines the properties of heat treated screws with a tapping screw thread in accordance with ISO 1478, designed with a drilling point which automatically drills the core hole for the screw during assembly. These screws automatically form the mating screw thread, either in a cutting or in a non-cutting operation and with the aid of threaded portion of the screw adjoining the drilling point. Ensures the screws are able to drill their core hole and form their mating screw thread without becoming fractured or distorted in the process, providing no overstressing has occurred.