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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 $$$

Hampstead, MD  |  410-239-7766

With over 100 years of employee experience in fasteners, we have placed all of our emphasis on maintaining reliability for service, quality, and value (at competitive prices, of course). We maintain an immense inventory of over 195 million fasteners in stock. And if you can't find what you need in our stock, we can manufacture it to your particular specifications and requirements, in any finish or material necessary. Call or email us today!

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World Fasteners, Inc. $$$

Brooklyn, NY  |  800-456-2658

Founded in 1979, Tanner Bolt & Nut is intent on supplying our customers with the best product, combined with quality service and competitive pricing. We promise that we will try to ensure that our customers have a satisfying and productive experience every time they call our sales office or visit one of our websites.

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Tanner Bolt & Nut Corp. $$$

Winston-Salem, NC  |  800-642-0921

From our inventory of over 130,000 different fasteners, we know precisely which ones are right for your application. We test them for material composition and measurement accuracy. With our Vendor Management Inventory service (VMI) our Service Technicians monitor your needs and keep you fully supplied at all times. Our ISO 9001 and AS9120B certifications helps us maintain system standards that ensure the fasteners we supply are the highest quality parts available.

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Southern Fasteners & Supply, Inc. $$$

Houston, TX  |  281-447-0081

At Eastwood Manufacturing, we have the experience to fill your fastener requirements. We manufacture not only standard parts, but unusual sizes and nonstandard configurations. Providing eye bolts, anchor bolts, hex bolts, sockets, screws, nuts, studs and more, Eastwood responds quickly and positively to all of your fastener needs. For high standards of accuracy and quality, call Eastwood today!

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Eastwood Manufacturing $$$
placeholder image Ford Fasteners, Inc. Ken Forging World Fasteners, Inc. Tanner Bolt & Nut Corp. Southern Fasteners & Supply, Inc. Eastwood Manufacturing

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