Shop Heavy Hex Bolts Online at South Coast Fasteners

South Coast Fasteners, Inc. offers a selection of heavy hex bolts built for strength, stability, and durability in demanding structural applications. These bolts feature a larger head than standard hex bolts, providing more surface area for load distribution and wrenching power. They’re a go-to fastener in construction, infrastructure, manufacturing, and heavy equipment maintenance anywhere you need fasteners that can take the pressure without giving out.

Whether you're securing beams, assembling heavy machinery, or working on pressure piping systems, we stock the right grade, finish, and size to match your job specs. And if you're not sure what to use, we’re here to help you sort through it.

South Coast Fasteners Provides Bulk Fastener Savings That Add Up

Use the options below to order top-quality fasteners in the sizes and specifications you need. Questions about our fastener options? Contact our office in Anaheim, CA today, and our team will be happy to assist you. Whether you need repeat bulk orders or one-off small batch purchases, South Coast Fasteners has you covered for all your industrial fastener supplies.

Types of Heavy Hex Bolts

A307 Grade A Hex Bolt, Plain

A307 Grade A hex bolts are made from low carbon steel for general-purpose construction and assembly applications. The plain finish provides a clean, uncoated surface ideal for indoor or protected environments. Commonly used in structural framing, machinery, and non-critical fastening jobs.

A307 Grade A Hex Bolt, Zinc CR+3

These A307 Grade A bolts feature a CR+3 zinc coating that offers improved corrosion resistance with a smooth, bright finish. They deliver reliable performance in moderate environmental conditions. Ideal for fabrication, light construction, and maintenance work.

A307 Grade A Hex Bolt, Zinc Yellow CR+6

Finished with a yellow CR+6 zinc plating, these bolts combine corrosion resistance with high visibility and easy identification. The coating improves protection against rust and wear in industrial or outdoor use. Often used in mechanical, construction, and equipment repair applications.

A307 Grade A Hex Bolt, HDG

Hot-dip galvanized A307 Grade A bolts provide maximum corrosion protection with a thick, durable zinc coating. Designed for outdoor and structural applications, they resist rust and weathering in harsh environments. Commonly used in infrastructure, marine, and agricultural projects.

Grade B7 Heavy Hex Head Cap Screw, A193/SA 193, Plain

Manufactured to ASTM A193 Grade B7 standards, these heavy hex cap screws are made from heat-treated alloy steel for high tensile strength. The plain finish offers a clean surface suitable for controlled environments or post-coating applications. Ideal for pressure vessels, flanges, and high-temperature service.

A307 Grade B Heavy Hex Bolt, Plain

A307 Grade B heavy hex bolts are built for greater tensile strength than Grade A, suitable for higher load-bearing applications. The plain finish provides a smooth surface ready for custom coatings or indoor assembly. Common in construction, heavy machinery, and industrial maintenance.

A307 Grade B Heavy Hex Bolt, Zinc CR+3

These heavy hex bolts feature a CR+3 zinc finish for added corrosion resistance and smooth threading. Engineered for strength and durability, they meet A307 Grade B requirements. Commonly used in steel fabrication, equipment assembly, and field installations.

A307 Grade B Heavy Hex Bolt, HDG

Hot-dip galvanized A307 Grade B bolts provide rugged corrosion protection and high performance in outdoor or marine settings. The heavy hex head design allows for greater wrenching strength and load distribution. Ideal for bridges, poles, and structural assemblies exposed to the elements.

USA A307 Grade B Heavy Hex Cap Screws, Plain

Proudly made in the USA, these A307 Grade B heavy hex cap screws provide consistent strength and precision for industrial use. The plain finish offers versatility for finishing or coating as needed. Used in infrastructure, manufacturing, and equipment assembly.

USA Grade 5 Heavy Hex Bolt, Plain

USA-made Grade 5 heavy hex bolts are heat-treated for higher tensile strength and reliability under stress. The plain finish provides a clean surface ready for coating or controlled installation environments. Ideal for machinery, construction, and automotive applications.

USA ASTM A354 Grade BD Heavy Hex Bolt, Plain

Constructed to ASTM A354 Grade BD standards, these heavy hex bolts are alloy steel fasteners offering exceptional strength and durability. The plain finish allows for custom plating or coating to match project requirements. Commonly used in heavy equipment, bridges, and critical structural connections.

USA ASTM A354 Grade BD Hex Bolt, Plain

These U.S.-manufactured ASTM A354 Grade BD hex bolts deliver high strength and superior mechanical performance. Made from quenched and tempered alloy steel, they withstand extreme loads and stress. Perfect for demanding structural, industrial, and energy-sector applications.

Heavy Hex Bolts - Material Options

South Coast Fasteners stocks heavy hex bolts in trusted material grades that provide strength, durability, and reliability across both standard and high-pressure builds.

A307 Grade A

Made from low carbon steel, these general-purpose bolts are ideal for non-critical applications like bracing, light framing, or metal-to-wood connections. A solid pick for everyday builds that don’t require high tensile strength but still need dependable holding power.

A307 Grade B

A step up from Grade A, this version offers higher tensile strength and is typically used for cast iron flanges, pressure piping, and other plumbing or utility infrastructure jobs. Stronger than basic construction bolts, but still easy to work with on-site.

Grade A

A common option for carbon steel fasteners used in light structural, agricultural, or general industrial use. These bolts are cost-effective and versatile, working well for medium-duty installations where reliability and compatibility matter most.

A193 B7 Steel

A high-performance alloy steel that’s been heat-treated to handle high pressure, extreme temperatures, and corrosive environments. Common in refineries, chemical plants, and power generation, A193 B7 bolts are engineered for critical applications that demand serious strength and endurance.

Heavy Hex Bolts - Available Finishes

South Coast Fasteners offers multiple finish options to meet jobsite conditions, corrosion resistance needs, and code requirements.

Hot Dip Galvanized

Provides excellent protection against rust and corrosion, especially in outdoor or marine environments. This thick zinc coating bonds tightly to the bolt, making it ideal for structural steel, utility work, and anything exposed to the elements.

Plain

Raw, untreated steel that’s best suited for indoor, dry environments or when additional coatings or treatments will be applied on-site. Simple, economical, and ready for fabrication or finishing.

Yellow Zinc Cr+6

Adds a golden chromate layer over zinc for enhanced corrosion resistance and easy visual identification. Common in mechanical, automotive, or electrical installs where appearance and performance both matter.

Zinc Cr+3

A clean, bright finish that offers reliable corrosion protection and a smooth surface. This trivalent zinc coating is widely used across general hardware, industrial machinery, and light fabrication work.

Why Choose South Coast Fasteners?

At South Coast Fasteners, we know heavy hex bolts aren’t just another fastener, they hold up the structures and systems that keep your projects standing. That’s why we focus on stocking proven grades, offering reliable finishes, and backing it all with service that keeps things simple. Whether you’re planning a full structural install or need a few bolts to get through the week, we’ve got the parts and the people to make it easy.

Shop Heavy Hex Bolts Online at South Coast Fasteners

South Coast Fasteners makes it simple to get the heavy hex bolts you need in the materials, grades, and finishes your project calls for. Browse our inventory online, or reach out for help with selection, technical questions, or bulk pricing. We’re here to help you get it done right, without slowing you down.