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Lag Bolts

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Lag bolts are generally large, heavy duty and often industrial bolts, though smaller variations are available for use in furniture and cabinetry industries. Popular in construction, masonry, locomotive, mining and civil engineering industries lag bolts are used as fasteners at integral joints of such structures as bridges, railway trestles, decking and even barn construction. Read More…

Lag Bolts A lag bolt is a mechanical fastener with a threaded body that is driven through two adjacent surfaces for the purpose of adjoining them securely. Also known as a lag screw, this piece of hardware is most often used to link wooden elements with other wooden parts or concrete foundations.
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Leading Manufacturers

Hackensack, NJ  |  800-272-3673

Our company has a reputation for superior products, customer service, and dependability. All our fastener products are built to last, and we know that our customers appreciate our dedication to using the best materials and manufacturing techniques. If you would like to learn more about us, contact us by phone or email, or stop by our website today!

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Ford Fasteners, Inc. $$$

Jefferson, OH  |  888-536-3674

Our company has manufacturing experiences dating back to 1970 and over the years we have grown into an international supplier of bolts.

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Ken Forging $$$

Houston, TX  |  713-868-2351

Delta Fastener Corp. supplies headed fasteners from only quality manufacturers. Our huge, readily available selection includes industrial bolts, nuts, washers, screws, etc. in a wide range of metal types and grades. Check out our online catalog or give us a call today for industrial bolts and more!

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Delta Fastener Corp. $$$

Indianapolis, IN  |  800-428-4686

We design and manufacture the most reliable bolts on the market today. Take a look at our website for fasteners, screws, pins, locknuts, metric fasteners, bolts, clamps, anchors, rivets, threaded rods and more. With our numerous distribution centers, you are bound to find one near you.

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Wurth Industry $$$

Cerritos, CA  |  714-676-8200

Tengco is your source for fasteners. We have over 30 years of experience in providing nuts, bolts, washers, forgings and more for use in a wide range of applications. We work closely with our manufacturers to ensure that all customer specifications are met and our test labs perform extensive testing for tensile, proof load and hardness. For standard or specialized fasteners, think Tengco.

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Tengco $$$

Huntington Beach, CA  |  800-394-6396

Since 1980, we have specialized in designing corrosion- and weather-resistant strong bolts which include industrial bolts, shoulder bolts, metric bolts, aircraft bolts, stainless steel bolts and carriage bolts. We offer commercial parts serving markets with high-quality, cost-effective industrial bolts.

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Ocean State Stainless, Inc. $$$
placeholder image Ford Fasteners, Inc. Ken Forging Delta Fastener Corp. Wurth Industry Tengco Ocean State Stainless, Inc.

Wooden components such as posts and beams are commonly connected with these devices as they offer an extremely secure connection without causing significant damage to the woodwork. To ensure a continually high degree of clamping force when tightened, lag bolts are made of strong materials that are not likely to stretch, expand or crack over time. The specific material depends on the intended use and environmental pressures to be inflicted upon the bolt. Zinc-plated steel and hot dipped galvanized steel are popular choices as they are low cost and still offer some resistance to rust. Stainless steel and silicone bronze, however, offer heightened protection against the elements as they are highly resistant to corrosion from moisture and chemicals that may be present in some industrial settings.

The manufacturing process used to create lag bolts is similar to that of other bolt types. A steel or bronze wire rod is first heated consistently for an extended period of time and all rust particles are removed. If needed, the metal is coated for added protection. Cold forging is then used to shape the rod at room temperature and the rod is forced through dyes at a high pressure to be shaped into long perfectly round rods. Once cut down to the desired length, a second dye shapes the head of the lag bolt which may be either square or hexagonal.

Cold forging using high pressure rollers is then used to press in the thread pattern. The finished course-pitched lag bolt is then ready for use in a variety of applications. A pilot hole is made in the first piece of wood or other material and the bolt is inserted. A wrench, spanner or pliers are then used to drive the screw into the second bit of material. The threading bites into the wood to hold the two components together.

During installation, caution must be used so as not to damage the head of the screw. The head provides compression while preventing the bolt from being driven completely through both materials. In some instances a washer is also used to protect softer lumbar, ensuring that the head will not sink into the wood. It is important to consider the materials to be fastened as well as the strength and corrosion resistance required of the bolt materials. Other considerations include the bolt length and diameter.

Lag Bolt Informational Video