Commonly used Grade 5 hex cap screws are heavier duty than Grade 2 steel options and are made from medium carbon steel and heat-treated. Grade 5 steel has 120,000 psi tensile strength and meets ASME B18.2.1 dimensional standards and SAE J429 material quality standards. These screws may be used in medium-duty applications. They come in a black oxide finish or may be zinc plated or chrome plated. Zinc plating helps provide durability in wet environments. Chrome plating increases the hardness, durability, and corrosion resistance of screws.

*Grainger’s product supplier has certified that products marked “Made in USA” below comply with "Made in USA" requirements in accordance with FTC rules and guidance

High-tensile Grade 8 hex cap screws are stronger than grades 2 or 5 steel. These screws hold fast in high-stress areas. Grade 8 steel has 150,000 psi tensile strength and meets ASME B18.2.1 dimensional standards and SAE J429 material quality standards. They come in a zinc yellow, or black oxide finish, or may be armor-plated for corrosion resistance. Black oxide screws work well in dry environments and armor-plated screws resist salt water and acids.

*Grainger’s product supplier has certified that products marked “Made in USA” below comply with "Made in USA" requirements in accordance with FTC rules and guidance

Grade 9 steel construction allows these hex head cap screws to have higher tensile strength and higher yield strength than Grade 8 steel. The Grade 9 screws maintain the highest clamp force available in a standard screw assembly and are used in the harshest environments including chemical applications. They come in a zinc yellow finish for corrosion resistance in wet environments.

These screws are sold in a plain bronze finish and are used in marine environments, areas of high corrosion and high heat, and in electrical installations.

These screws are sold in a plain finish and are frequently used to fasten marine equipment or for underwater construction needs. They resist foul weather and high-UV environments.

Left hand threaded fasteners are tightened by turning them counter clockwise instead of clockwise. Made from 18-8 stainless steel, these screws are magnetic and chemical resistant. These screws are designed to secure heavy-duty objects within or against other objects in harsh environments.

These Mil. Spec. hex head cap screws meet or exceed U.S. military specifications and standards to ensure high performance and reliability in extreme conditions. They are often used for defense-specific applications, aerospace, and other highly demanding situations.