Type B - without rest position, without locknut
Type BK - without rest position, with locknut
Type C - with rest position, without locknut
Type CK - with rest position, with locknut
GN817.2 Indexing Plunger, Long Plastic Knob, Steel
These indexing plungers correspond to GN817, they only differ by having a longer knob.
Type C/CK are used for such applications where the plunger has to stay in its retracted position. To achieve this, the knob is rotated by 90 degrees after being retracted. A notch keeps the plunger in this position.
Steel ST - blackened
Plunger - tempered
Knob - Plastic (Polyamid PA), black, matt, not removable
Also available in stainless steel.