These can be very useful when fitting cabinet hinges, for example, as the hardware is often metric. Metric Forstner bit sets are also available. Although larger Forstner bits are available, they’re usually sold individually as they’re bigger than most people need. Sometimes, the smallest bit in a set will be ½-inch. Bit Size & Number of BitsĪ standard twist drill is fine for drilling holes of small diameters, so Forstner bits are not usually found below ¼-inch. HCS bits won’t cut aluminum and other soft metals, or tile and masonry. These bits are still hard enough to drill into wood and wood-based materials. HCS is slightly softer than HSS, though the term “softer” has to be taken into context. One or two manufacturers use High Carbon Steel (HCS). However, professionals or individuals who use these tools frequently may want to invest in a carbide Forstner drill bit set. Many DIY users will be fine to use HSS bits on their own. With a carbide tip, the bit will be capable of cutting materials like aluminum or tile. These tips are then bonded onto the body of the bit, resulting in an edge that stays sharper for much longer. The solution is to add tungsten carbide tips (often referred to as carbide, for short). However, with frequent use, HSS bits tend to lose their edge quickly. They’re durable, resistant to corrosion, and can drill through wood and steel. HSS drill bits are typically titanium-made drill bits and have a titanium oxide coating. The majority of Forstner drill bits are made of High Speed Steel (HSS). The Precision Shear design, which was introduced by Freud has a serrated edge with a steep interior angle that produces a very sharp edge, and rapid, chisel-like cutting action. These are designed for more aggressive cutting and are particularly good for end grain. Saw-tooth Forstner bits have a series of teeth that resemble a coarse saw blade. A central spur, which is just a fraction of an inch longer than the teeth, allows for precise positioning. A longer edge increases cutting speed and a bar across the center pushes the waste out of the way as the bit rotates. The width of this tooth varies-on some, it’s slender, while on others it might be as wide as ¼ the drill bit circumference. These teeth are located directly opposite each other and are designed to cleanly slice through wood fibers as they rotate. The standard Forstner bit has two individual teeth on the perimeter. When selecting the best Forstner bit set, pay attention to its size to ensure it’ll cover the range of tasks you need it for. While these dissimilarities may be seemingly minor, they can make a big difference to efficiency. However, there are differences in the materials used, and the design of the cutting edges. Photo: What to Consider When Choosing the Best Forstner Bit SetĪt first glance, all Forstner bits appear very similar.
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