Bosch HSS Cobalt Metal Twist Drill Bit 4mm - 1 Pc

Key specs include cobalt alloy construction for heat resistance, a 4mm diameter, a precision-ground tip for clean holes, and compatibility with standard drills that accept common drill bit shanks.

Cobalt enhances hardness and heat resistance, reducing wear and maintaining sharpness during extended drilling into tough metals. This means longer tool life and more consistent hole quality under demanding conditions.

It's well-suited for hard metals such as stainless steel, cast iron, hardened steel, and other tough alloys. It provides efficient, accurate drilling in these materials compared to standard high-speed steel bits.

Use moderate drilling speed, apply steady pressure, and consider a light lubrication or cutting oil to reduce heat. Let the bit do the work without forcing it, and back out occasionally to clear chips for clean holes.

Keep feeds steady, avoid overheating, and use lubrication when drilling metals. Store the bit in a dry place and re-sharpen as needed to maintain cutting performance.

Yes. It’s designed to work with most standard drills that accommodate common drill-bit shanks, making it easy to swap in and out of your existing setup.

Compared with other 4mm drill bits on Fepy, the Bosch HSS cobalt bit typically offers superior heat resistance and edge retention for metalworking. For examples of close alternatives available on Fepy, you can review these items (note: urls are for reference): - Bosch HSS Cobalt Drill Bit 4mm: https://fepy.com/product/bosch-hss-cobalt-drill-bit-4mm - DeWalt HSS Cobalt Drill Bit 4mm: https://fepy.com/product/dewalt-hss-cobalt-drill-bit-4mm - Makita HSS Cobalt Drill Bit 4mm: https://fepy.com/product/makita-hss-cobalt-drill-bit-4mm

Use it for metal fabrication, automotive repairs, construction projects involving hard metals, and DIY tasks where stainless steel or other tough metals need holes with high precision.

Unplug the drill or remove the battery, open the chuck, insert the bit shank fully, and tighten the chuck firmly. Test on a scrap piece to confirm it’s secured and cutting properly before continuing on your main workpiece.

While cobalt HSS bits may have a higher upfront cost than standard HSS bits, they typically offer longer life and better performance on hard metals, which can reduce replacement frequency and downtime on demanding projects.

Yes. Always wear eye protection and gloves, secure the workpiece with clamps, avoid loose clothing, and keep hands clear of the rotating bit. Use appropriate lubrication and ensure the drill is held steady to prevent wandering or kickback.