Detailed Product Description (VACUUM PUMP)The company specially produces screws and molten-rubber cylinders for ... gram plastic injection machines, 15-300mm single screw extruders, 30-130mm tapered and parallel double screw extruders, rubber machinery, petroleum machinery, ... , nitriding, grinding, and polishing. The company can make the screw cylinder made of GH113 Nickel-based alloy which can also ...