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Stainless steel is robust, hard-wearing and corrosion resistant – which is why it’s such a popular material for manufacturers. You’ll find stainless steel used in almost every sector, including construction, automotive, transportation and consumer goods. The properties that make stainless steel so attractive also make it challenging to work with. Drilling through stainless steel requires the right machinery, the right tools and the right approach. In this guide, we describe how to drill stainless steel and stay safe.

Steel has low thermal conductivity, which means heat doesn’t dissipate quickly. This can lead to heat building up on the cutting edge, which can cause damage and deterioration. The strength of the material makes it resistant to chipping, which can lead to a build-up of material around the edges of holes, lessening their strength. Stainless steel is also highly ductile, which means it stretches more than other metals, making it harder for the bit to remove chips.

When drilling through stainless steel, avoiding the build-up of heat is essential, so ensure to lubricate and cool the drill bit regularly. As well as improving the cutting performance, this will increase the usable lifespan of the drill bit.

Stainless steel is an iron alloy that contains at least 10.5% chromium. The addition of chromium provides a protective layer of oxide on the surface of the metal, which prevents rust from forming and provides attractive heat resistant properties.

At R.D. Barrett we stock a huge selection of drill bits for cutting through all materials, including stainless steel. You can view a selection of our tools online, or give us a call. We’re able to source drill bits and machine tools from a huge variety of manufacturers for all applications.

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R.D. Barrett was established in 1975 by Ron Derek Barrett, an ex employee of both DS & G Lathes and Ford Motor Company. We hold one of the UK largest stock of engineering tooling.

Work hardening can cause stress to machinery and drill bits, shortening their life and increasing the chance of breakage.

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Stainless steel isn’t the hardest metal around, but it is challenging to work with. The biggest issue is the risk of work hardening. If the cutting speed of the drill is too high and the feed is too slow, the heat generated can harden the material – making cutting more difficult.

To drill through stainless steel, you need an HSS (High-Speed Steel) drill bit. HSS drill bits have sharp edges that can cut into the tough metal. To cut into hardened stainless steel, you will require a drill bit with a large point angle of at least 130 degrees.

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When it comes to drilling through stainless steel, speed and feed are critical considerations. As we’ve mentioned before, if your drill’s RPM is too high, the material will heat up and harden. When it comes to cutting steel, less is often more – with slower drilling speeds producing better results. It is, however, crucial that you maintain the surface footage per minute (SFM).

The process of drilling can generate significant amounts of heat both on the drill bit and the material. Be careful when handling the drill bit or workpiece, particularly if you aren’t wearing gloves.

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Drilling through stainless steel can be dangerous, so it’s critical to follow all safety procedures and processes. The biggest risk is hot chips of metal that can be thrown into the air. Wearing the correct personal protective equipment (PPE) will ensure you’re as protected as possible.

HSS drill bits are a different shape and made from different materials to those used to cut through wood or stone. There is a variety of HSS sharp drill bits with various designations. Here’s an explanation of what they mean:

When working with stainless steel, it’s advisable to drill in stages. This stop-start approach reduces the build-up of heat and allows both the tool and the material to cool down. Depending on the required hole diameter, you may drill in stages, using progressively larger drill bits until you achieve the desired result.

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Feed rates can be high when drilling stainless steel. Not only will this increase the effectiveness of the tool, but it will also more effectively evacuate chips. It’s important to ensure that the feed rate is maintained and that you regularly check that heat isn’t building up in the material or the tool. If it is, then be sure to give it time to cool down.

We recommend that you choose either a cobalt drill bit or carbide drill bit for stainless steel hole making. These high-quality and hard-wearing drill bits are able to stand up to the pressure of stainless steel, cutting through it with ease.

Stainless steel contains carbon, silicon and manganese within it. Some steels will also have elements of nickel and molybdenum added to increase corrosion resistance.

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Drilling into stainless steel requires precision tools for the perfect finish. At R.D. Barrett, we hold the UK’s largest selection of machine tools. If we don’t have it in stock, we can obtain it for you – at the best possible price. You can view a selection of machine tools on our website, or get in touch with us today. We’re always on hand to provide straightforward advice and guidance to help you select the right tool for the job.