Threading screws defined in the DIN 7500 standard published by the German Standardization Institute (DIN) are of two types:
It has machine threads in a three-lobe configuration designed to efficiently thread through pre-drilled pilot holes in metal. When threading the substrate, the trilobular shape of the tooth hardens the substrate and creates a smooth grain flow in the metal. This reduces the drive torque required for insertion and minimizes loosening from vibration. It also eliminates chip formation during insertion.
In fact, the DIN 7500 standard consists of two parts:
In the mentioned standard, the requirements for thread forming screws are listed under the following headings:
Similarly, the ISO 7085 standard published by the International Standards Organization (ISO) describes the requirements for hardened and tempered metric threading screws (ISO 7085 Mechanical and performance requirements for hardened and tempered metric threading screws). Thread rolling screws to this standard manufacture female threads that fit ISO general purpose metric threads in the range from 2mm to 12mm nominal thread diameter for use in general engineering applications. However, the ISO 898-1 standard cannot be applied to screws produced according to this standard.
Metric tapping screws are screws with coarse machine threads that round (shape) the mating threads while hardening the mating material. The result is superior torque that can resist vibration loosening, but the drive torque required for installation is low.
Our organization, among the numerous test, measurement, analysis and evaluation studies it has given for businesses in various sectors, with its trained and expert staff and advanced technological equipment, hardened and tempered metric threading for thread forming screws within the scope of DIN 7500 standard and within the scope of ISO 7085 standard. It also provides testing services for the mechanical and performance requirements of screws.
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