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What are lag bolts?

In this guide, we’ll explore the differences between lag bolts and other types of bolts used for TV mounting, along with important considerations and facts you should know.

When it comes to mounting a TV securely on drywall or solid wood, choosing the right bolts is crucial for stability and safety. Among the various options available, lag bolts stand out as a popular choice due to their strength and versatility.ย 

What Are Lag Bolts?

Lag bolts, also known as lag screws, are heavy-duty fasteners designed for strong and secure connections. They have coarse threads and a hexagonal head, which allows them to be driven into wood or other materials with the help of a wrench or socket. Lag bolts are commonly used in applications where a sturdy hold is required, such as attaching heavy objects like TV mounts to wooden studs or solid wood surfaces.

Types of Bolts Used for TV Mounting

Machine Screws

Machine screws are typically used with nuts to fasten components together. They have finer threads compared to lag bolts and are often used in conjunction with wall anchors for mounting TV brackets on drywall.

Toggle Bolts

Toggle bolts are ideal for mounting heavy items on drywall where no stud is available. They feature spring-loaded wings that expand behind the wall, providing a secure anchor point.

Wood Screws

Wood screws have coarse threads and are designed specifically for use in wood. They are suitable for mounting TV mounts directly onto wooden studs or solid wood surfaces.


Various types of anchors, such as plastic anchors, sleeve anchors, or concrete anchors, are used when mounting TVs on concrete, brick, or other masonry surfaces. These anchors provide a secure base for attaching bolts or screws.

Differences Between Lag Bolts and Other Bolts

1. Thread Type

Lag bolts have coarse, deep threads that provide excellent grip in wood, whereas machine screws have finer threads suitable for nuts.

2. Head Type

Lag bolts typically have hexagonal heads for use with a wrench, while machine screws have flat or rounded heads for use with a screwdriver.

3. Usage

Lag bolts are primarily used for heavy-duty applications where strong holding power is needed, such as mounting TV mounts to wooden studs or solid wood. Machine screws are often used with wall anchors for lighter-duty applications on drywall.

Things to Know About Lag Bolts

1.Size and Length: Choose lag bolts that are long enough to penetrate through the drywall and securely anchor into the wooden studs behind. The size of the lag bolt should match the size of the pilot hole drilled into the wood.

2. Pre-Drilling: It’s important to pre-drill pilot holes before installing lag bolts to prevent splitting the wood and ensure proper alignment.

3. Weight Capacity: Lag bolts are capable of supporting heavy loads, but always check the weight capacity of your TV mount and ensure that the lag bolts used can safely support the weight.

4. Tightening: Use a socket wrench or impact driver to tighten lag bolts securely into the wood. Avoid over-tightening, which can strip the threads or damage the wood.

Important Facts About Lag Bolts

  • Lag bolts are made of strong materials like steel or stainless steel to withstand heavy loads and outdoor conditions.
  • Always use washers under the bolt heads to distribute the load and prevent damage to the wood surface.
  • Lag bolts are not suitable for use with wall anchors in drywall; they require a solid wood base for proper installation.

In conclusion, lag bolts are an excellent choice for securely mounting TV mounts on wooden studs or solid wood surfaces due to their strength and reliability. Understanding the differences between lag bolts and other types of bolts will help you make informed decisions when it comes to TV mounting projects. Always follow proper installation techniques and safety guidelines to ensure a secure and stable mounting solution for your TV.

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