Product Details Material Steel Type Hex Cap Screw Product Weight 0.0499 lbs. Notes 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 8 has a greater tensile strength than Grade 5. Designed for use in high-strength and high-stress 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: 150,000 psi for 1/4 - 1-1/2". Diameter 5/16" Diameter-Thread Size 5/16"-18 Finish Yellow Zinc Grade 8 REACH Y Specification SAE J429 System of Measurement Imperial (Inch) Thread Coarse Thread Size 18 Wrench Size 1/2" Length 2" Thread Type Partial Thread MFG in the USA Y.