Hex Head Cap Screws are designed for easy assembly into a tapped hole. Hex Cap Screws meet SAE specifications with a specially designed washer face under the head and a chamfered point. Grade 9 has a greater tensile strength than Grade 8. Designed for use in high-stress and high-strength applications. Yellow Zinc fasteners have been plated with a clear zinc coating and are then coated again with a yellow dichromate. Yellow Zinc offers a modest amount of corrosion resistance, slightly higher than clear Zinc. Minimum Tensile Strength: Typically 180,000 psi.