Technopolymer plastic (Polyamide PA), black, shiny finish
Transparent sight cap with magnifying effect
Positioning symbols on self adhesive foil printed in silver-grey / black
design plastic revolving handles.
EN 518 tapered knobs do not require a thread at the shaft. During mounting, easy blows with a soft hammer are sufficient to drive the knob into place. The shaft end should be slightly rounded or chamfered (30°). The knobs sit absolute vibration-tight.
The transparent sight glass allows symbols to be placed underneath.
Once the knob is mounted on the shaft, the symbol is placed into the recess of the separately supplied sight glass and driven home with a soft hammer.
The symbol is fully protected from dirt and liquid by the tight connection between the sight glass and the knob.
Maximum heat resistance of plastic knob: 90°C (194°F).
For positioning symbols for these knobs, see EN 517.1.