Specification：31 x 4MM
Customers can customize the specifications
Material：410 stainless steel
Materials can be iron or stainless steel
The surface treatment in addition to dacromet can also do nickel or zinc plating(coloured zinc and white zinc)
The surface treatment color may have the bronze color, the light bronze color, the teal gray color and so on, may make to order by the customer
All screws are salt mist tested. The proportion of salt water is 5% and the requirement of salt fog is 1000-3000 hours. After the test, all the screws are free from rust.
Stainless steel material
Hex head washer screw is a metal screw made of 100% 410 stainless steel, which belongs to one of the highest degree of corrosion resistant steel. It has a longer service life than other screws made of other materials on the market.
Hex head washer screws are not only suitable for indoor and outdoor use, but also important parts of self squaring gate stop hardware. Stainless steel drilling screws are superior to ordinary steel and have good rust resistance in water.
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