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Lag Bolts

A reliable source for Lag Bolts information and leading Lag Bolts Companies & Manufacturers.

Lag screws, which are also sometimes referred to as lag bolts, are among the strongest fasteners. These screws are distinct from common sheet metal, self-drilling, and wood screws. Lag screws are enormous when compared to the majority of these more-common screws. Lag screws are at least one inch long and one-quarter inch thick. Although the threading on these screws may be coarse, it does not extend to their entire length. Lag screws need a hole to be drilled into an object before they can be used. A nut is also used with lag screws to increase their strength and security and to aid in holding items together. 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

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 $$$

Winston-Salem, NC  |  800-642-0921

With more than 130,000 commercial and industrial grade fasteners in inventory, our wide distribution network is positioned to get you the parts you need fast. Whether we’re keeping your bins full with a Vendor Managed Inventory Program or rushing emergency replacement parts with 24-hour on-call service, you’ll know that we’ve got you covered. Our HQ’s quality system is certified to AS9120 ...

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Southern Fasteners & Supply, LLC $$$

Philadelphia, PA  |  215-537-8700

As one of the most experienced industrial bolt manufacturers in the world, we put our experience to work in the development and production of your part: eye bolts, anchor bolts, hexagon bolts, stainless steel bolts and u bolts. We’re a proud member of the AISC, and our roots reach back to 1864. Our clients trust us to supply the best bolts, washers, nuts, rods, weld studs, turnbuckles, and...

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Haydon Bolts, Inc. $$$

Bolingbrook, IL  |  630-964-2600

G-Fast brings you precision components and fasteners that are designed for commercial and military applications. We specialize in precision machined components, special fasteners, cold-formed bolts, studs and shoulder screws, deep drawn parts, metal spinning, wire forming and a whole host of other services. We’ve been doing this since 1990 and would love to see you be our next customer!

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S.W. Anderson Company $$$

Kansas City, MO  |  800-369-2658

Established in 1961, BTM Manufacturing creates fastener and threaded components for OEMs across the country. We design high-quality U-bolts, J-bolts, spade bolts, studs, anchor bolts, eye bolts, and rods for multiple applications. We provide custom manufacturing services to ensure customers can find the right part for their project.

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BTM Manufacturing $$$
placeholder image Ken Forging Southern Fasteners & Supply, LLC Haydon Bolts, Inc. S.W. Anderson Company BTM Manufacturing

Lag screws are typically used in applications with heavy loads since they have a substantially higher load capacity than the typical sheet metal or wood screw. Although lag screws are often used to secure wood components just like wood screws, lag screws can also be used to secure metal, concrete, and even stone fixtures. These incredibly-strong fasteners are used to connect heavy lumber or other materials bearing a significant weight, build things like decks, link lumber around the house, and maintain your flat-screen TV's long-term attachment to the wall.

lag screw

How Lag Bolts are Installed

The first step in installing lag screws is to confirm that all of the materials utilized in an application are properly aligned. Then, clamps should be used to securely hold everything in place. Next, drill a pilot hole with a slightly smaller diameter than the lag screw that will be used to ensure everything is securely fastened. Finally, make sure to drill through the exact spot where the screw will eventually be placed to complete the hole.

Large hex heads on lag bolts tend to stick out from the material when they are fastened. Consider lag bolt heads that protrude on a level deck as an example of how this could be ugly or even dangerous in some circumstances. One can drill countersink holes as a workaround to conceal the bolt head within a material.

Using a big spade drill bit, create a countersink hole in the previously-drilled pilot holes. Make sure to measure the diameter of the lag bolt head and provide enough space for the socket wrench to fit and perform its function of securing the bolt with the material. One may use a motorized drill if a bit is available. If one wants to follow this route, move cautiously and slowly. If a user fastens a bolt too tightly, it may break off inside the material and create a severe headache.

clamping of materials

Types of Lag Bolts

Typically, lag screws come in three finishes: zinc, hot-dipped galvanized, and stainless steel. Screws made of zinc are frequently utilized in interior applications. Unfortunately, zinc lag bolts are less common and more difficult to find than the other varieties.

Lag bolts that have been hot-dipped galvanized are the most popular and least expensive option. In addition, lag bolts that have been hot-dipped galvanized, often known as galvanized, are excellent for use with pressure-treated wood and outdoor applications because they are corrosion-resistant.

The most expensive lag screws are made of stainless steel. They may be up to twice as expensive as standard galvanized lag screws. Stainless steel bolts are utilized when beams are in contact with water or in situations with high levels of salt. The most typical applications for stainless steel lags are found with dock and oceanside buildings.

stainless steel lag bolts

Advantages of Lag Bolts

  • Lag screws can withstand high pressure without cracking or suffering any harm. As a result, lag screws are frequently used by manufacturing and construction firms to link large objects.
  • Lag screws provide a greater level of performance since they are longer and thicker than other screws. They remain in place thanks to their strength and durability even when under the weight of heavy, massive objects.
  • Lag screws are long-lasting in addition to having outstanding strength and endurance. A typical lag screw has a core made of high-carbon steel and an external shell of galvanized zinc. The galvanized zinc covering shields the screw's steel core from rust and corrosion. Lag screws don't typically rust or corrode because moisture and oxygen can't easily pass through galvanized zinc. As a result, they provide a great level of stability and security to the things on which they are employed while lasting for decades.

Choosing the Right Lag Bolts Supplier

To make sure you have the most constructive outcome when purchasing Lag Bolts from a Lag Bolts Supplier, it is important to compare at least 5 Companies using our list of Lag Bolts manufacturers. Each Lag Bolts Supplier has a business profile page that highlights their areas of experience and capabilities and a contact form to directly communicate with the manufacturer for more information or request a quote. Review each Lag Bolts company website using our proprietary website previewer to get an idea of what each business specializes in, and then use our simple RFQ form to contact multiple Lag Bolts businesses with the same form.

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Bolts Power Pages

Types Of Bolts

Types Of Bolts

Bolts are mechanical devices used in assembling and fastening objects, typically used with a matching nut. They are designed to be installed in aligned unthreaded holes of multiple parts...



A fastener is a non-permanent or permanent mechanical tool that rigidly connects or affixes two surfaces or objects together. Non-permanent fasteners can easily be removed without damaging the joined materials...

Self-Drilling Screws

Self-Drilling Screws

A self-drilling screw is a type of tool that has the same design features as a drill bit or cutting tool. As the name implies, self-drilling screws do not require a pilot hole in order to perform as a fastener...

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