Machine parts made of ceramics used in the field of mechanical engineering, namely, welding pins and welding sleeves used for resistance welding to locate metal parts, for electrical insulation to avoid sticking of sputtering and stud welding, positioning and locating pins for centering two metal parts to assemble these parts, [ nozzles used for air texturing, interlacing, tangling and spin finish migration in the area of filaments of chemical fibres, broaches, mold inserts, ] stamping dies, ...