Twist drills with the dimensions specified in the thread standard should be used for the mounting thread.
Normally the core hole should not be countersunk. Deburring is permissible, but not larger than the nominal diameter of the mounting thread. If KOBSERT® is used with sealing ring or KOBSERT® HP, countersinking is always necessary.
Metric ISO thread in accordance with DIN 13, cut with standard taps (6 H).
Standard DIN thread plug gauges should be used to verify that thread is true-to-gauge.
Manual or motor-driven installation tools are available to install the thread insert. The thread insert is screwed into the workpiece until the safety flange is resting on the surface of the workpiece. The installation procedure – pressing the safety flange into the workpiece – is carried out by a relative axial movement between the spindle, which has been screwed in, and the frontend assembly of the installation tool. The spindle is then removed again.
To remove KOBSERT® thread inserts from a workpiece, proceed as follows:
- Use a twist drill (Ø = external thread diameter) to drill into the safety flange as far as the thread.
- Lever out the safety flange using a triangular scraper or screwdriver.
- Insert a tool for unscrewing – or a suitable triangular scraper if necessary – into the internal thread to permit a transmission of forces. Turn the bush to the left to remove it.
Screw in a thread insert of the same nominal size until the safety flange is in the same position as before – turn it back slightly if necessary – and press it flat into the surface with the installation tool in the usual manner.