The best drill bit for stainless steel is the Amoolo Cobalt Drill Bit Set. These drill bits are Industry grade 6542 high speed steel, and they are harder than 4241 HSS used in other similar drill bits. These drill bits also contain 5% cobalt, which helps increase their resistance to wear and makes them more durable. They are perfect for cutting hard metal such as stainless steel, steel and cast iron.
This is a 13 piece drill bit set that has the most commonly-used sizes. Those sizes are:
They come in a plastic storage bag.
Buyers rate these highly, and they seem to sell pretty well online. What really helps is that each bit has a fully ground spiral groove, and this design helps clear particles quickly. That in turn reduces friction and heat and helps the bit cool faster. That in turn helps prolong their life.
They also have a 135 degree split point and a straight shank that helps prevent walking and makes drilling precise and faster. The main reason we like these is that they are well priced, cover a nice range of sizes, and overall get good buyer reviews and ratings.
How to Drill Stainless Steel in Video?
They key to drilling stainless steel is to keep the drill bit as cool as possible, and also to keep it lubricated. Ordinary fresh water is all you need to achieve that, so no need to buy any type of expensive lubricant.
Stainless steel contains chromium and that is a very hard metal. When you try to drill that, you almost instantly create a friction that can quickly build up the heat. (We mean REALLY hot). Spraying water helps keep the stainless steel cooler and your drill bit cooler.
Another tip is to slow down the drilling speed. With wood, plastic or lighter metals speed is not really an issue, as these are softer materials. Stainless steel is much harder so pick a slower drilling speed as that also helps reduce the friction.
Best High End Drill Bits for Stainless Steel
- If you have more available cash, then it would be worthwhile going with the DEWALT Cobalt Drill Bit Set with Pilot Point
- These are designed for all hard materials including stainless steel
- It is a 14 bit set with sizes 1/16" bit, 5/64" bit, 3/32" bit, 7/64" bit, 1/8" bit, 9/64" bit, 5/32" bit, 3/16" bit, 7/32" bit, 1/4" bit, 5/16" bit, 3/8" bit (There are two 1/16, and two 1/8)
- These bits have a pilot point and split tip design that starts on contact and eliminates bit walking
- Most commonly used for drilling into stainless steel, angle iron, I-Beams, and other similar metals.
Best Budget Drill Bits for Stainless Steel
- For anyone on a budget, this set of Hymnorq M35 cobalt steel drill bits appear to be a popular choice online
- They are heat resistant and the manufacturer states that these are up to 12 times longer life span when compared with an average HSS drill bit
- This is a 13 piece set with sizes 1.5mm, 2mm, 2.5mm, 3mm, 3.2mm, 3.5mm, 4mm, 4.5mm, 4.8mm, 5mm, 5.5mm, 6mm, 6.5mm
- They are designed for cutting through hard metals such as stainless steel and cast iron