Lag Bolts vs. Lag Screws

Attribute	Lag Bolts	Lag Screws
Head Type	Hexagonal	Hexagonal or Round
Thread Type	Coarse	Coarse or Fine
Length	Usually longer	Usually shorter
Application	Heavy-duty construction	General purpose fastening

Introduction

When it comes to fastening heavy materials together, lag bolts and lag screws are two popular options. Both are commonly used in construction and woodworking projects, but they have some key differences that make each one better suited for certain applications. In this article, we will compare the attributes of lag bolts and lag screws to help you determine which one is the best choice for your project.

Size and Shape

Lag bolts, also known as lag screws, are large, heavy-duty fasteners that are typically used to secure heavy materials such as wood or metal. They have a hexagonal head that can be tightened with a wrench or socket, and a threaded shaft that extends from the head. Lag screws, on the other hand, are similar in size and shape to traditional screws, with a pointed tip and a threaded shaft that extends the length of the screw.

Strength and Durability

One of the key differences between lag bolts and lag screws is their strength and durability. Lag bolts are generally stronger and more durable than lag screws, making them ideal for applications where a high level of strength is required. Lag screws, on the other hand, are better suited for lighter-duty applications where strength is not as critical.

Installation

Installing lag bolts and lag screws requires different tools and techniques. Lag bolts are typically installed using a wrench or socket, while lag screws can be installed using a screwdriver or drill. Lag bolts are often used in applications where a high level of torque is required to tighten the fastener securely, while lag screws can be easily installed with a power tool.

Applications

Lag bolts are commonly used in construction projects, such as building decks, fences, and other structures that require a high level of strength and durability. They are also used in woodworking projects where heavy materials need to be securely fastened together. Lag screws, on the other hand, are often used in furniture assembly, cabinetry, and other applications where a smaller, lighter fastener is needed.

Weather Resistance

Another important factor to consider when choosing between lag bolts and lag screws is their weather resistance. Lag bolts are typically made of stainless steel or galvanized steel, which makes them resistant to rust and corrosion. Lag screws, on the other hand, are often made of carbon steel, which can rust over time if exposed to moisture. This makes lag bolts a better choice for outdoor applications where the fasteners will be exposed to the elements.

Cost

Cost is also a consideration when choosing between lag bolts and lag screws. Lag bolts are generally more expensive than lag screws, due to their larger size and higher strength. However, the added cost may be worth it for applications where a high level of strength is required. Lag screws are a more cost-effective option for lighter-duty applications where strength is not as critical.

Conclusion

In conclusion, lag bolts and lag screws each have their own unique attributes that make them better suited for different applications. Lag bolts are stronger and more durable, making them ideal for heavy-duty construction projects. Lag screws, on the other hand, are better suited for lighter-duty applications where strength is not as critical. Consider the size, shape, strength, durability, installation requirements, applications, weather resistance, and cost when choosing between lag bolts and lag screws for your next project.