Threaded body: Steel, black oxide finish
Plunger pin: Steel, hardened and ground
Knob:Matte black technopolymer plastic (Polyamide PA), not removable
Lock nut: Steel, black oxide finish, DIN 439 / ISO
GN 817 indexing plungers offer the following advantages:
--Two retracting strokes l1 per plunger diameter
--When plunger is retracted the mechanism is partly shrouded
--Defined thread length by an undercut at the end of the thread
Used in applications where the plunger must not protrude continually.
To achieve this, the knob is rotated by 90° after being retracted.
The head of the plunger body is provided with a suitable notch
in opposite positions so as to prevent the plunger from accidentally
slipping back into its forward position due to error or vibration.
This indexing plunger has the unique feature of the pull knob
partially enclosing the top of the plunger body, allowing
less debris to enter into the mechanism.
Maximum heat resistance of nylon plastic hand knob: 110°C