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What are spoon bits made of?

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Image of tool steel - the material used to make spoon bits Spoon bits are made from tool steel, a variety of steel that contains a high carbon content to increase its strength and hardness.
Spoon bit blank during the forging process While the forging process heat treats the steel in a spoon bit, the bits do not undergo the same hardening process as some other tools, and remain in a softer state.
Image showing a spoon bit fixed inside a lathe chuck The fact that spoon bits are softer than other bits means that they can be gripped more easily in the chuck jaws of a lathe, as the teeth of the jaws can squash into the bit more easily and hold it firmly in place.
DIYer sharpening a spoon bit on a curved grinding wheel It also means that the bits are easier to sharpen.
A spoon bit boring into a wooden pipe Despite being softer than other types of bit, spoon bits are still more than hard enough to cut through wood.
Image to show that spoon bits are produced without any form of coating as it would quickly be worn away due to sharpening As they need to be sharpened relatively often, spoon bits are usually made without coatings. Sharpening the bit would remove any coating from the edge of the tool and compromise any corrosion resistance that the coating would offer, so it makes sense not to waste money on it!