Industrial Bolts banner

Lag Bolts

A reliable source for Industrial Bolt information and leading Industrial Bolt Companies & Manufacturers.

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.
Request for Quote

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!

Request A Quote

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.

Request A Quote

Ken Forging $$$

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.

Request A Quote

Southern Fasteners & Supply, Inc. $$$

Orange, CA  |  714-639-2040

With over 20 years experience in distributing specialty fasteners to the aerospace, commercial, military, construction, electronic and marine industries, you can count on Integrity Fasteners for all your fastener needs. We supply screws, metric fasteners, industrial fasteners and more.

Request A Quote

Integrity Fasteners, Inc. $$$

San Diego, CA  |  619-231-5966

We are a master distributor of virtually every type of bolt, screw, washer, and nut you can think of. We are your complete source, even doing custom manufacturing when unique specifications are required. This diversity provides our customers with a strategic advantage; certified quality, superior service, and fast delivery.

Request A Quote

Hayes Bolt & Supply $$$
placeholder image Ford Fasteners, Inc. Ken Forging Southern Fasteners & Supply, Inc. Integrity Fasteners, Inc. Hayes Bolt & Supply

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