You searched for "thread insert"
Elesa
Elesa 166172 Black Glass Fibre Reinforced Polyamide Clamping Knob, M6 x 16, Threaded Stud
Part: 166172
Black reinforced plastic clamping knob with M6 thread for machinery and equipment adjustment.
Elesa
Elesa 166173 Black Glass Fibre Reinforced Polyamide Clamping Knob, M6 x 20, Threaded Stud
Part: 166173
Black reinforced plastic clamping knob for machinery adjustment and control applications.
Elesa
Elesa 166174 Black Glass Fibre Reinforced Polyamide Clamping Knob, M6 x 30, Threaded Stud
Part: 166174
Black reinforced plastic clamping knob M6 for lightweight machinery applications.