Grade 8 Hex Cap Screws

South Coast Fasteners, Inc. supplies Grade 8 Hex Cap Screws built for maximum strength in tough, high-load environments. Made from alloy steel and heat-treated for extra toughness, these screws are designed to perform when failure simply isn’t an option.

You’ll find them in heavy machinery, structural assemblies, automotive systems, and industrial equipment where strength and reliability are critical. With a hex head for secure installation and consistent torque, Grade 8 screws deliver the durability and performance your toughest jobs require.

Get Superior-Quality Fasteners at Competitive Prices

Use the options below to find the fasteners you need in the quantities required for your application. Questions? Contact us today, and our team will gladly assist you in finding the best fastening solutions for your requirements. With South Coast Fasteners, you can count on helpful support, competitive pricing, and top-quality products for all your fastener requirements.

Material Options

South Coast Fasteners stocks Grade 8 hex cap screws in both inch and metric standards to support high-load, high-stress fastening applications across automotive, structural, and heavy equipment industries. Each material option is selected for its ability to maintain integrity under torque, tension, and vibration in the most demanding conditions.

Grade 8

This American standard hex cap screw is made from medium carbon alloy steel that has been heat treated to achieve high tensile and yield strength. Grade 8 fasteners are widely used in automotive suspension systems, heavy-duty machinery, and structural frameworks where safety and load capacity are critical. They are easily identifiable by their six radial lines and are engineered to hold up under repeated load cycles without deformation.

Grade 10.9 (ISO 4017)

Metric coarse-thread hex cap screws that meet ISO 4017 specifications. Grade 10.9 is equivalent in strength to Grade 8 but built to international standards for machinery, equipment, and construction systems. These fasteners are commonly used where metric compatibility is required and durability under torque is non-negotiable. Their wide threading allows for faster installation while still offering excellent mechanical grip.

Grade 10.9 (ISO 8676)

This is the fine-thread alternative to ISO 4017. Grade 10.9 ISO 8676 hex cap screws offer the same strength and performance but with tighter thread engagement. Ideal for precision fastening applications where vibration resistance, space constraints, or exact tensioning is important, including engine components, structural reinforcements, and critical assemblies with minimal clearance.

Available Finishes

South Coast Fasteners offers Grade 8 hex cap screws in a selection of finishes tailored for corrosion protection, surface hardness, and application-specific appearance.

Green Zinc Bake

This vibrant green zinc finish is baked on to enhance corrosion resistance while offering a clean, easily identifiable look. Often specified in military, agricultural, or OEM assemblies for quick visual identification and moderate weather resistance.

Plain

Uncoated steel with no added plating or surface treatment. Ideal for dry environments, internal assemblies, or cases where the fastener will be painted or coated post-installation. Offers full metal-to-metal contact and minimal dimensional interference.

Yellow Zinc Bake Cr+6

A hexavalent chromium finish that provides a bright, yellow-gold appearance along with superior corrosion resistance. Baked post-plating to relieve hydrogen embrittlement, this finish is commonly used in automotive, construction, and high-strength industrial applications where both durability and visual inspection are important.

Why Choose South Coast Fasteners?

At South Coast Fasteners, we know that when it comes to critical builds, you can’t settle for anything less than strong and reliable. That’s why we stock dependable, spec-compliant Grade 8 Hex Cap Screws with fast availability, solid quality, and hands-on industry experience to back them up.

Order Grade 8 Hex Cap Screws Online Today

Finding and ordering Grade 8 Hex Cap Screws for your toughest jobs is simple with South Coast Fasteners. Browse our full inventory online and order confidently. Need help with specs, finishes, or bulk orders? We’re here to provide the strength and service you need when it matters most.