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Turning Machining Part Alloy Steel Wheel Hub Stud Black Oxide Wheel Bolt for Car Spare Part. Alloy steel wheel stud, turned and thread rolled. Splined knurl presses into the hub. Threaded end accepts the wheel nut. Grade ten point nine clamping strength. Black oxide finish resists road corrosion. Every unit is 100 percent inspected with factory inspection report. Quality Control: Includes 100% inspection with visual and functional testing for all parts. DFM Support: Engineering team provides Design for Manufacturability recommendations.