Best Structural Bolts of 2025

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Structural bolts are heavy-duty fasteners specifically designed for use in structural applications. These bolts are commonly used to connect heavy steel components, such as beams, columns, and trusses, in construction projects. They are made from high-strength materials, such as carbon steel or alloy steel, which provide the necessary strength and durability to withstand heavy loads and ensure the structural integrity of the building. Structural bolts typically have a larger diameter and a higher tensile strength compared to standard bolts, making them suitable for demanding applications where safety is paramount.
At a Glance: Our Top Picks
Top 10 Structural Bolts
Ozco OWT Timber Bolts 56651
The Ozco Timber Bolts are designed to enhance your building projects with their impressive features. Each pack includes two robust bolts measuring 3/4-inch by 8-10-inch, perfect for various structural applications. You can easily pre-drill using a 3/4-inch auger bit, ensuring a precise fit. To secure the bolts, a 3/8-inch hex driver is required, allowing for straightforward tightening. Not only do these bolts provide strength and stability, but they also boast an attractive appearance, making them a great choice for visible structures.
Conquest Fasteners 3/4"-10 x 3" A325 Bolts
The Conquest Fasteners A325 Bolts are designed for high-strength structural applications. With a diameter of 3/4 inch and a length of 3 inches, these fully threaded heavy hex bolts provide a secure connection, ideal for steel-to-steel connections. The plain finish ensures durability and resistance to corrosion, meeting ASTM A325 standards. With 25 bolts included in each pack, you have plenty of fasteners for your projects, making it a convenient choice for builders and contractors looking for reliable structural solutions.
Conquest Fasteners A325 Heavy Hex Bolts
The Conquest Fasteners Hex Bolts are designed with a diameter of 3/4 inch and a length of 2-1/2 inches, making them ideal for various structural applications. With 10 threads per inch, these bolts provide a secure fit for your projects. The hot dip galvanized finish ensures they resist corrosion, enhancing their durability in challenging environments. As heavy hex structural bolts, they are engineered to create strong connections in steel-to-steel applications, perfect for securing steel beams. You can trust these bolts to deliver reliable performance for your construction needs.
Hillman Combo Sidewalk Bolt, Stainless Steel
The Hillman Sidewalk Bolt is a sturdy and reliable product made of strong and durable stainless steel material. It offers best-in-class corrosion protection, making it perfect for marine area applications. With 100 pieces included in each package, you can easily protect your home. The combo drive feature allows you to use either a #3 Phillips bit or a slotted bit for installation, providing convenience and flexibility. The Hillman Sidewalk Bolt is designed to withstand rust and corrosion, ensuring its long-lasting durability. It is an essential hardware item for any homeowner or DIY enthusiast looking for a reliable and efficient solution for securing various structures.
Hillman Group Sidewalk Bolt 100 Pack
The Hillman Sidewalk Bolt Pack features sturdy and reliable bolts made from durable stainless steel, ensuring they can withstand tough conditions. Their rust-resistant properties make them ideal for use in marine environments, so you can trust them to last. With 100 bolts included, you’ll have plenty to protect your home and tackle various projects. Installation is easy with the combo drive design, allowing you to use either a Phillips or slotted bit. This versatility makes your work more efficient and hassle-free.
GRK 3/8" x 8" Structural Screws
The GRK Structural Screws are an excellent alternative to traditional lag screws for fastening structural wood. Their design makes installation a breeze, allowing you to complete projects efficiently. These screws are code approved for wood-to-wood applications, ensuring they meet safety standards for both interior and exterior use. The integrated washer head enhances clamping force, providing a secure fit that boosts the strength of your connections. By choosing these screws, you can enjoy peace of mind knowing your structural projects are reliable and durable.
GRK 132231 HandyPak Structural Screws
The GRK Structural Screws are made from high-quality PHEINOX stainless steel, ensuring durability with a limited lifetime warranty. This means you can trust them for long-term projects without worrying about rust or wear. The screws feature a self-tapping W-cut thread design, making installation easier, as you won't need pre-drilling for most applications. Additionally, they use a GRK Bit T-30, providing a secure fit while enhancing driving efficiency. For larger sizes, the CEE thread design offers even more grip and stability, making these screws a reliable alternative to traditional lag screws.
Xadnitu 100 Pieces Hurricane Bolts
The Xadnitu Hurricane Bolts are designed for various applications, making them ideal for both woodworking and machinery assembly. You will appreciate how easy they are to install; all you need is a #3 Philips bit or a combination driver. Crafted from durable iron with nickel plating, these bolts resist corrosion and wear, ensuring they last even in tough conditions. Their cross-shaped slot design allows for secure fastening, giving you peace of mind that your materials are protected. Whether you're securing panels or assembling equipment, these bolts offer the strength and reliability you need.
The Hillman Group 44163 3/8-16 x 1-Inch Body Bolt
The Hillman Group 44163 3/8-16 x 1-Inch Body Bolt is a versatile and reliable structural bolt that is perfect for various applications. With a package length of 8.89 centimeters, package height of 3.302 centimeters, package width of 6.35 centimeters, and a package weight of 0.5 pounds, this bolt is convenient to handle and transport. The high-quality construction ensures durability and strength, making it suitable for heavy-duty tasks. Whether you're working on a construction project or need to secure structural components, this body bolt is the ideal choice. It provides a secure and tight fit, ensuring stability and safety. The Hillman Group 44163 3/8-16 x 1-Inch Body Bolt is a reliable and convenient option that will meet your structural needs.
Hillman M6 Connecting Bolt 20-Pack
The Hillman M6 Bolts are designed for easy installation, making your projects hassle-free. Their long lifespan means you won't have to worry about frequent replacements, which saves you time and effort. These bolts are perfect for both industrial and commercial applications, ensuring versatility in various settings. Plus, their corrosion-resistant feature protects them from wear and tear, providing durability in different environments. With a compact package size, these bolts are easy to store and handle, adding to your convenience.
During our structural bolt research, we found 24 structural bolt products and shortlisted 10 quality products. We collected and analyzed 6,128 customer reviews through our big data system to write the structural bolts list. We found that most customers choose structural bolts with an average price of $23.75.
The structural bolts are available for purchase. We have researched hundreds of brands and picked the top brands of structural bolts, including Ozco Building Products, Conquest Fasteners, Hillman, GRK, Xadnitu. The seller of top 1 product has received honest feedback from 216 consumers with an average rating of 4.7.

Brian Howie is a content writer and senior industrial designer. After graduation from Westminster College, he has been engaged in product design and manufacturing for 18 years. Brian Howie has always found great pleasure in designing industrial products and sharing his ideas and experience online.