As a low-carbon steel, stainless steel has a natural hardness that comes without traditional hardening.ĭrilling stainless takes a strong bit-the same M42 cobalt bits we recommend above. Stainless steel alloy includes chromium (at least 10%) and nickel to make it corrosion-resistant. Hardened steel is a medium of high-carbon steel that gets heat-treated, quenched, and finally tempered. The same bits you use on hardened steel work on stainless. We have great news for anyone looking for the best drill bits for stainless steel. With a bit less cobalt in the steel blend, it just heats up a bit more quickly. The Irwin 29-piece Cobalt M-42 Metal Index Drill Bit Set performs very similarly to the M42 set. Our best drill bits for hardened steel include the following: Best Drill Bits for Hardened Steel Drill America D/A29J-CO-PC 29-pc Cobalt SetĪlso good: Irwin 29-piece Cobalt M-35 Metal Index Drill Bit Set Using a drill press is often the best way to get quality results. However, whatever differences there are between the outer look or chemical composition, both hardened steel and stainless steel are quite difficult to drill into. Because of rust and stain resistance, good luster, and low maintenance, it has many commercial uses including cookware, cutlery, home appliances, construction fasteners, and surgical instruments. Stainless steels are steel alloys consisting of at least 10.5% chromium and there are different grades. The best drill bits for metal could be designed for these hardened steel applications or they might be optimized for speed in softer carbon steels. Much of the steel materials that we see used in mechanical engineering, energy generation, and transportation are basically hardened steel. Hardened steels are durable and can be wear-resistant, corrosion-resistant, and abrasion-resistant. The set’s rubber overmolded case protects against damage from accidental dropping, and you can remove cartridges to easily carry bits from the case to your worksite.When we talk about drilling in hardened steel, we mean medium or high carbon steels typically made using a heat-treatment and tempering process. A reduced shank above the 3/8-inch point lets you use larger drill bit in a 3/8-inch chuck, and you can select the right bit using a convenient tap and drill selection chart. The 135-degree split point tips start drilling on contact and cut with less force. The 29 bits are made using heavy duty web construction for strength and durability, and the cobalt steel extends the life of cutting edges. The Irwin 29-Piece Cobalt M-35 Metal Index Drill Bit Set includes drill bit sizes measuring from 1/16 to 1/2-inch in 1/64 inch increments. IRWIN Tools Cobalt Alloy Steel High-Speed Steel Drill Bit, 29-Piece Metal Index Set (3018002). Includes drill bit sizes 1/16- to 1/2-inch in 1/64-inch increments. Metal index case for easy bit access and identification. 135-degree split-point tip starts drilling immediately with less force and eliminates “walking” across the work surface. 8% Cobalt Alloy Steel alloy is heat and abrasion-resistant. Made from industrial grade High-speed steel for increased durability. Ideal for drilling in tough metal, including heavy-duty abrasive alloy metal drilling on hardened steel.
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