Combination tap and drill bits are a useful tool that helps to streamline your drilling and tapping processes. They make light work of many threading applications because they mix together drilling and tapping and put it into one tool, giving you the ultimate versatility. Using these bits speeds up your project progress and makes it much easier to work with a wide range of materials, such as sheet metal and thinner plate stock! They’re perfect for quick tasks that would usually require a separate tap and drill kit, which makes them much longer, reducing the amount of time you spend on the simplest of tasks.
Here at Rennie Tool Company, we offer premium drill and tap drill bits to suit your project needs and make every application so much easier. We provide the highest quality bits that are designed to give you accuracy, speed and durability. Whether you need to use them for maintenance work, fabrication or even DIY projects, you can easily find the exact tap bits you need.
What is a Tap Drill Bit?
A tap drill bit is a specialised tool that aids you in creating a hole and a thread in one go. This means that you can drill and tap by using only one tool, rather than needing a separate tap and drill kit. These combination tap and drill bits are best used with cordless drills, drill drivers, pillar drills,tapping machines and lathes, providing fast and efficient drilling and thread cutting in a range of materials. However, when it comes to making a high-quality thread, it’s less about the drill bit and more about the correct size. It’s essential to get the right tap and drill bit sizes to produce flawless results and avoid oversized or undersized holes, which can cause problems like weakened threads.
Why Choose Our Drill and Tap Drill Bits?
Choosing our drill and tap drill bits can provide you with numerous benefits that aid your project and help to make every application easier and quicker. With our quality drill and tap bits, you can:
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Save Time: As these combine drilling and tapping into a single tool, you can reduce downtime and improve productivity. This saves you time during your project and lets you spend less time switching between tools.
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Get Precise Results: Every drill bit is made to give you the ultimate precision in any application. You can rely on our collection to always give you accurate and consistent results, as well as a smooth drilling and threading experience.
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Have Multiple Sizes: Our range of tap drill bits offers multiple sizes to suit various projects. Whether you’re taking on large construction tasks or a smaller repair, we have the right tool for the job.
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Gain a Quality and Durable Tool: Every bit in this collection is made from quality high-speed steel (HSS) to give you excellent durability and longevity. Enjoy an Easy-to-Use Design: These bits boast a hexagonal shank design to give you a secure grip in your drill chuck. This helps to prevent any slippage to improve control during use. They also have self-centring points to minimise walking and offer pinpoint accuracy.
Our Collection of Tap and Drill Bit Sizes
We have a large collection of tap and drill bit sizes to choose from, so that you can get the right bit for your job. Each drill bit in our range offers exceptional high-performance and unparalleled accuracy for you to achieve high-quality results. They’re made from quality materials to offer strong durability for you to rely on time and time again, withstanding a wide variety of materials and regular use. Whichever size you need for your project, you can trust our collection to always give you clean and efficient thread cutting across all sorts of materials. All of our tap and drill bit sizes provide a steady 1/4” hex shank and can be used across various machines, including lathes, tapping machines and CNC milling machines.
Drill Bit Size for M3 Tap – Metric Coarse
For an M3 x 0.5 metric coarse thread, the recommended tap drill size is 2.5mm. Our combination M3 x 0.5 tap and drill bit allows you to drill and tap in one operation, making it ideal for smaller, more detailed projects that require accuracy and efficiency.
Designed for precision work, these bits are commonly used in electronics, light fabrication, model making, and precision engineering applications. The integrated design helps produce accurate threads while reducing tool changes and setup time.
We also offer an M3.5 x 0.6 version to suit a wider range of threading applications.
Drill Bit Size for M4 Tap – Metric Coarse
For an M4 x 0.7 metric coarse thread, the recommended tap drill size is 3.3mm. Our combination M4 x 0.7 tap and drill bit is designed to produce clean, accurate threads while allowing drilling and tapping in a single operation.
Ideal for general engineering, bracket fabrication, maintenance work, and everyday workshop assembly tasks, these bits provide reliable performance and improved efficiency by reducing tool changes. The precision-ground design helps create accurate threads with a clean finish across a range of suitable materials.
Drill Bit Size for M5 Tap – Metric Coarse
For an M5 x 0.8 metric coarse thread, the recommended tap drill size is 4.2mm. Our combination M5 x 0.8 tap and drill bit is designed to drill and tap in one operation, producing strong, accurate threads with improved efficiency.
Manufactured from high-speed steel with a titanium coating, these bits offer durability and reliable performance across a range of materials. They are ideal for mechanical repairs, automotive applications, maintenance work, and structural fitting tasks where consistent thread quality is essential.
Drill Bit Size for M6 Tap – Metric Coarse
For an M6 x 1.0 metric coarse thread, the recommended tap drill size is 5.0mm. Our combination M6 x 1.0 tap and drill bit is designed to produce consistent, accurate threads while allowing drilling and tapping in a single operation.
This size is a popular choice for machinery assembly, medium-duty fastening applications, fabrication work, and general engineering projects. Manufactured for reliable performance across a range of materials, these bits are suitable for use on stainless steel, mild steel, aluminium, and hard plastics.
Drill Bit Size for M8 Tap – Metric Coarse
For an M8 x 1.25 metric coarse thread, the recommended tap drill size is 6.8mm. Our combination M8 x 1.25 tap and drill bit is designed for drilling and tapping in one operation, helping to improve efficiency while producing strong, accurate threads.
Ideal for larger fastening applications, these bits are commonly used in structural work, heavy-duty assemblies, fabrication, and engineering projects where reliable thread strength is essential. Manufactured from durable materials for long-lasting performance, they are suitable for use on steel, aluminium, stainless steel, and various plastics.
Drill Bit Size for M10 Tap – Metric Coarse
For an M10 x 1.5 metric coarse thread, the recommended tap drill size is 8.5mm. Our combination M10 x 1.5 tap and drill bit is designed for drilling and tapping in a single operation, delivering strong, accurate threads for demanding applications.
Suitable for heavy-duty fabrication, industrial installations, machinery maintenance, and engineering work, these bits are built to handle tougher materials and larger fastening tasks. Manufactured for durability and reliable performance, they are ideal for use on steel, stainless steel, aluminium, and other commonly machined materials.
On top of these options, we also offer a 6-piece pack in our collection to suit your project needs. These include one of each size from M3 all the way to M10, so that you can easily switch between sizes for each application. This saves you time and money on buying individual pieces and trying to find them when you need them most!
Find the Best Tap Drill Bit for Your Project
Find the best tap drill bit for your project in our collection and completely transform every drilling and tapping task. These bits save you time and effort while producing exceptional quality results and impressive longevity for a tool you can regularly rely on. Contact us on 0161 4779577 to discuss your needs with our experts and to order now!
