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Home / News / Comparison between Spade Bits and Auger Bits

Comparison between Spade Bits and Auger Bits

Auger bits generally drill cleaner holes with smoother sides and less chipping. They are commonly used for general wood drilling in construction, carpentry in gardening, and many other fields. Spade drills have rougher sides and are therefore used for areas that will be covered. For example, these bits are often used when installing electrical conduit or water pipes through a wall, as the holes will be covered with a better finish.
Design is a significant difference between these two bits. An auger bit is a helical drill with a threaded tip on the front and two chisels on each tip. These chisels are responsible for planning the wood. Spade bits are flat. They need a comfortable design, shaped like a shovel or paddle, with two sharp lips on each end and a pointed unthreaded guide tip.
Auger bits require downward pressure when drilling, making them more comfortable. The tip of the thread pulls the drill down and creates an automatic drive mechanism that works immediately, even if it's just the drill's load pushing down. Spade bits may have sharp tips, but they don't have threads, so they don't drive themselves. So you want to dig fast with more downward force. Using only the load of the drill bit, drilling can take a short time.
Due to the helical design, auger bits are suitable for precision drilling. This shows that they will dig a hole of equal width when cutting straight or at an angle. The threaded tip firmly bites into the wood to stop movement, allowing for a highly precise cut. Spade bits are available for custom drilled shapes and sizes. The tool can easily adjust the angle at the beginning or while drilling, which allows you to make tapered holes or holes that are smaller/larger in width than a flat blade.
Auger bits in drilling are fast and very deep. The depth of the drill is determined by the thread tip, and it can automatically drive the tool to very deep depths with little effort. Ideally, these drills can be as deep as 600mm while creating an elegant hole. In a practical sense, the only limiting factor is the length of the tool. However, since the drill bit has a large area of ​​contact with the wood (front and sides) when making deep holes, it is recommended to try at a slower speed to avoid overheating. As for spade bits, drilling very deep is not recommended as you will need to apply a lot of downward pressure. On the plus side, they generate less heat even at fast speeds in depth.
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