ThePipingMart Blog Fasteners What is Cot Screw? Types and Uses

What is Cot Screw? Types and Uses

Cot Screw

Cot screws are a type of fastener used to secure two pieces of material together. They are incredibly versatile and can be used in a variety of applications, from joining wood pieces to creating furniture and more. In this blog post, we’ll explore what cot screws are, the different varieties available, and their uses so you can choose the right one for your project.

What is Cot Screw?

Cot screws, also known as coach screws or lag screws, have an enlarged head and a threaded shaft designed to connect two pieces of material. Unlike traditional screws with a tapered shank with threads along their length, cot screws have a square or hexagonal head, which allows them to be driven into place using tools such as an Allen key or socket wrench. The threads on cot screws are much longer than those on other types of screws and extend all the way down the shaft until it reaches the tip. This allows them to provide greater holding power when securing two pieces of material together.

Cot Screw Types

Cot screws come in various sizes and materials, including stainless steel, brass, and zinc-plated steel. They also come in different thread sizes ranging from #8 (2-1/2”) up to #14 (3/4”). Additionally, they can be found in both coarse and fine thread varieties depending on the application they will be used for. For example, coarse threads are better suited for soft woods such as pine, while fine threads work better with harder woods like maple or oak.

Cot Screw Uses

Cot screws are most commonly used in woodworking projects where they can be used to securely join two pieces of wood together. They can also be used for metalworking projects where they provide a stronger connection than other types of fasteners due to their long threads that extend all the way down the shaft until it reaches the tip. Additionally, cot screws can be used for outdoor projects such as decks or fences, where their stronghold prevents any movement between boards over time due to weathering or wear and tear. Finally, cot screws can also be used in automotive applications where they provide superior strength when connecting engine parts or attaching accessories like spoilers or mud flaps to vehicles.


Whether you’re a professional craftsman working on complex projects or an amateur DIYer looking for reliable fasteners for your home improvement tasks, cot screws are an excellent choice for your project needs. Their versatility makes them ideal for any kind of job—from joining wooden boards together securely to attaching metal parts tightly—while their strong grip ensures that your project stays secure no matter what kind of wear-and-tear it may experience over time due to weathering or heavy usage. With so many sizes and materials available, you’re sure to find the perfect cot screw for any job!

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