GN 817 indexing plungers offer the following advantages: Two retracting strokes l1 per plunger diameter Identical dimensions l2 for GN 817 and GN 817.1 series Defined thread length by an undercut at the end of he thread Type G with threaded spindle is for applications where a specific knob or special receptacle is required for operation. Maximum heat resistance of nylon plastic hand knob: 110?C (230?F).