Cobalt Drill Bits (M35 or M42) – The gold standard. They cut stainless like butter (okay, hard butter). Use in magnetic-base drills to form burr-free holes by only cutting the outside edge of a hole Drill cone-shaped openings to mate with lathe centers or start pilot holes for screws Cut and repair internal and external threads and drill holes in many different sizes Drill and thread holes with the. In this guide, I'm going to walk you through exactly what I learned—what are the best drill bits for stainless steel, how to use them right, and which ones to avoid like the plague. Whether you're a weekend DIYer or just need to drill one clean hole, I've got you covered. 01 Manufacturer: Subject to compliance with these specifications, Eaton's B-Line series cable tray systems shall be as manufactured by Eaton. Drilling holes in steel requires sturdy bits with sharp cutting edges. You need to make an informed decision about the drill bit's size, length, flute design, and metal finish, as they determine. Drill bit size charts are everywhere—but most engineers use them too late. They don't help you understand what that size will cost you. It focuses on something more critical: 👉 How drill size decisions impact CNC cost, tolerances. Stainless steel is a challenging material to drill through due to its high strength and resistance to wear. One of the most common types of.