Metal drilling bit

The right tool for metal depends on the metal you’re drilling and the diameter of the hole you want. For steel and tough metals, choose High-Speed Steel (HSS) bits for good durability across a wide range of metals. For cleaner holes and more demanding tasks, opt for TCT-tipped bits when available for the chosen model. In the associated selection, you’ll find Bosch HSS sets covering 1 to 10 mm, Irwin 3.5 mm options, circular bits in 25 mm and 50 mm, and a 100 mm TCT hole saw for bigger projects.

Tip material and geometry determine durability and performance. HSS bits work well for most common metals and offer good versatility—such as Bosch HSS and Irwin sets covering diameters from 1 to 10 mm. For cleaner holes and more demanding applications, carbide-tipped bits or TCT hole saws increase wear resistance and reduce the risk of breakage. Circular bits designed for metal allow for larger diameters, such as 25 mm and 50 mm.

Two types of users benefit most from these tools. Casual DIY users will prefer versatility and sets that cover multiple diameters—for example, a 19-piece Bosch HSS set from 1 to 10 mm, or an Irwin 3.5 mm 10-piece set for metal and wood. Professionals or tradespeople typically need larger diameters and higher tolerances, using circular bits of 25 mm and 50 mm or a 100 mm TCT hole saw for clean, well-fitting holes in metal.

To keep bits lasting longer, use simple, appropriate practices. Store them in their case or in a dry place to prevent rust. Drill at the right speed and use a cutting fluid when needed to limit heat. Start with a pilot hole for larger diameters and don’t apply excessive pressure, which can cause breakage. After use, clean away chips and store properly to preserve sharpness and performance.

To choose correctly, match each reference to your task. For small holes in common metals, an HSS set from Bosch or Irwin covering 1–10 mm is ideal. For larger holes and specific applications, choose circular bits in 25 mm and 50 mm from APT. For deeper or more precise holes in difficult metals, the 100 mm TCT hole saw is suitable. By combining these options, you can cover anything from home DIY to more technical projects.

Use these drill bits according to safety and operating instructions. Drill at an appropriate speed and start with a pilot hole when the diameter is large. Use cutting lubricant and ease off pressure when the cutting begins to reduce heat and wear. Make sure the drilling tool is securely mounted and that the bit is compatible with the metal and the type of drill. After use, clean chips and store them in a dry place to extend their lifespan.