Name: bolt nut, rivert stainless steel pipe fitting, Machinery Parts. Material: stainless steel, carbon steel, brass, copper, steel and so on can be available. Applications range: Petroleum, chemical, power, gas, metallurgy, shipbuilding. construction, etc. Surface treatment: Trivalent Zinc Plating ( Cr3 / Chrome Free ), Silver & Yellow Salt Spray Test: > 72 Hours ( If customer have higher requirement, we can also do with 200 Hours ) Note: All CNC machining fittings can be produced accroding to your drawings or requirments!China Hardware Fitting factory website:http://www.shuangyuanchor.com/hardware-fitting/