Thread-rolling screws are screws that form their mating thread themselves in a pre-drilled or cast core hole without cutting by means of special thread geometry. Thread-rolling screws therefore act as a positive-locking retainer.
These screws are used in through-holes and very often in cast core holes (aluminium or die-cast zinc).
DIN 7500 is the oldest and most widely used design and defines the thread and the technical delivery conditions. However, screws such as Taptite, Duo-Taptite and Taptite 2000 are also currently very common on the market.
|The requirements for the evaluation of the mechanical and functional properties of a thread-rolling screw include:|
Edge hardness (E.H.)
|DIN 7500 + DIN 267-30 for the FKL 10.9 (ISO 20898-1)|
|Core hardness||DIN 7500 + DIN 267-30 for the FKL 10.9 (ISO 20898-1)|
|Minimum fracture torque||DIN 7500 + DIN 267-30 for the FKL 10.9 (ISO 20898-1)|
|Rolling torque||DIN 7500 + DIN 267-30 for the FKL 10.9 (ISO 20898-1)|