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. Specification 933 represents Full Threaded. Class 10.9 has a minimum tensile strength of 1040 MPa, or approximately equivalent to SAE Grade 8. 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.