4-40 x 9/16 Phillips Round Machine Screw Fully Threaded Zinc 1/4-28 and the black oxide finish

and the black oxide finish provides additional protection against wear and tear

The nut has a serrated flange that bites into the metal sheet

these screws provide superior resistance to corrosion and rust

making these screws ideal for use in humid or outdoor environments

and the 5/8-18 thread size ensures a strong hold

4-40 x 9/16 Phillips Round Machine Screw Fully Threaded Zinc 1/4-28 and the black oxide finishThis 4 40 x 9 16 Phillips round machine screw is fully threaded and made of zinc. It has a diameter of 4 40 and a length of 9 16 inches. The Phillips drive type has a cross shaped recess that accepts a Phillips screwdriver. The round head is slightly rounded and sits flush with the surface of the material being fastened. The fully threaded design means that the screw has threads along its entire length, providing a secure hold. Zinc plating provides