Engineered for serious metalworking, the Montana Brand 1-3/8 in. Alloy Steel Drill Bit with a 3-Flat Shank is built to tackle demanding holes with precision and control. From shop projects to professional fabrication, this bit delivers consistent performance where it counts.
Key features
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Material: Premium alloy steel designed for durability under high torque and heat.
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Finish: Black oxide coating reduces corrosion and provides smoother chip flow for cleaner holes.
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Shank: 3-flat shank minimizes slippage in chucks and keeps the bit aligned under heavy loads.
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Size: Drill size 1-3/8", ideal for large-diameter through-holes in metal and sturdy materials.
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Packaging: Sold in a clamshell package for secure storage and easy handling; 1 piece per package.
What makes this bit unique
Unlike standard round-shank bits, the 3-flat shank design locks firmly in place even during aggressive drilling. The combination of alloy steel and black oxide finish gives you a longer-lasting edge that resists wear mid-job, so you spend less time sharpening and more time cutting. This bit is particularly well-suited for drilling through steel, cast iron, and aluminum when you need a large-diameter hole with clean edges.
Use cases and ideal users
- Machinists and fabricators creating fasteners, brackets, or frame components require reliable large-diameter holes with minimal bit wandering.
- DIY enthusiasts tackling garage projects like mounting hardware, custom brackets, or metal shelving.
- Automotive and aerospace hobbyists performing reinforcement holes or chassis work where precision matters.
Tips for best results
- Use a slow-to-medium drilling speed and steady feed rate; large-diameter bits generate more heat, so consider a cutting lubricant or light tapping fluid to extend life.
- Start with a pilot hole if you’re drilling thick materials to improve alignment and reduce chatter.
- Keep the bit cool; pause to cool if you notice excessive heat or discoloration on the bit.
- Pair with a drill press or sturdy handheld drill with a secure chuck to maximize precision and reduce bit deflection.
Why choose Montana Brand
Montana Brand focuses on practical, dependable tooling that professionals and serious DIYers can rely on. This 1-3/8 in. alloy steel drill bit with a 3-flat shank combines robust construction with a design that minimizes slippage, helping you complete tough metalworking tasks faster and with cleaner results. The clamshell packaging keeps your tool organized and ready for the next project.
