Blackening Of Full Threaded Stud

　Color: The color of full threaded stud blackening treatment is black bright color or matte black. The surface is not bruised and the color is uniform.

　　Film thickness: 1.5-2.5 microns, does not affect the precision of the product, higher or lower than 1.5-2.5 has a greater impact on the product size and is a defective product.

　　corrosion resistance effect. Take 2 pieces to do the neutral salt spray test. It is better for the salt spray test to pass the 600-800 neutral salt spray test if it can’t reach 600 hours, it’s bad.

　　Full threaded stud should keep the surface clean, tidy, free of black and gray, and the film layer is firm.