... Oceania, Middle East, Africa3. Manufacturing method: forged or welded, lathe, hobbing, high frequency quenching,4. ... height, diameter8. Processing: forging hobbing, quenching. CNC machine9. Manufacture strictly in according to ISO, DIN ... cast iron, stainless steel, copper etcManufacturing methodweleded or forgedHeat treatmentHigh frequency quenchingSurface treatmentOxide black, galvanization, ...