... 2.Products with Customers' Design 3.Strong Machining & Heat Treatment Helical Gear :We are a reliable supplier that can make forging parts ... , Coupling, BOP Body, Tube Plate, Roller Forging, Ring Forging, Gear Blank, Gear Wheel. 2. Materials: Carbon steel, Alloy steel 3. Supplying range ... . Certification: ISO9001: 2000, CCS 10. OEM and Customized service offered Helical Gear