COMOWARE Countersink Drill Bits Set- 7Pcs Counter Sink Bit for Wood High Speed Steel, Woodworking Carpentry Reamer With 1 Free Hex Key Wrench. out of 5 stars 2, $$ $$  Go back to filtering menu. There's a problem loading this menu right now. Learn more about Amazon Prime. A countersink (symbol: ⌵) is a conical hole cut into a manufactured object, or the cutter used to cut such a hole. A common use is to allow the head of a countersunk bolt, screw or rivet, when placed in the hole, to sit flush with or below the surface of the surrounding material (by comparison, a counterbore makes a flat-bottomed hole that might be used with a socket-head capscrew). A countersink may also be used to remove the burr left from a drilling or tapping operation thereby improving the finish. Countersink bits come in a variety of stiles and sizes depending on the project, the screws you're using, and personal preferences. For utility shop furniture or other quick-and-dirty projects — especially temporary items — we often don’t care much about the screws. They can be visible or not, proud of the surface or not; sometimes, it just doesn’t matter. But for most of our work, if a screw is going to be visible we want it to look good, seated smooth and flush with the surrounding surface whenever possible. Sure, you could forcibly drive a flathead screw flush, but that almost always t   Types of Countersink Drill Bits. Fluted bits have one or more cutting edges, cross-hole countersinks have an angled hole in the tip which acts as the cutting edge. Create an account. However, these are premium-quality, professional tools, so one of these sets is worth the investment if your work demands it. In this example, a piece of tape is used to visually mark the intended depth of sset hole. We only make money if you purchase a product through our links, and all opinions about countersink bit set go products are our own. Co-authored by:.

Slowly drill into the pilot hole with the cutter to make your countersink. Finally, use your drill to secure the screw into the hole until the top is flush with the wood. To learn how to hide your screw with wood putty, keep reading! Did this summary help you? Yes No. We've been helping billions of people around the world continue to learn, adapt, grow, and thrive for over a decade. Every dollar contributed enables us to keep providing high-quality how-to help to people like you.

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Things You'll Need. Related Articles. Article Summary. Part 1 of All rights reserved. This image may not be used by other entities without the express written consent of wikiHow, Inc. Open the jaws of the calipers wide enough so you can put the screw between them. Tighten the jaws around the main shaft of the screw, but not on the threading, which is the raised area that rotates around the screw. Otherwise, the hole you drill will be too big and the screw will slip out.

Look through a set of drill bits and use your calipers to measure their diameters. There are many tables and guides online that specify how big pilot holes need to be depending on what size screw you have. Clamp the wood down to secure it.

Open the jaws of your C-clamp and secure them around the piece of wood you're drilling into. If it does, put another C-clamp on the opposite side. Put a dot on the piece of wood with a pen or pencil where you want to make your hole.

Then take the pointed end of your screw and push it lightly into the surface to make a small dent. Hold the drill so the bit is perpendicular to the wood. Apply light pressure to push the bit deeper into the wood until it reaches the same depth as your screw.

Part 2 of Use a cutter that matches the numbered size of your screw, which is usually 6, 8, or Secure the countersink cutter to the end of your drill so it fits tightly. Drill slowly into the pilot hole with the cutter to make countersink. Pull the trigger slowly and apply light pressure as you push the cutter further into the pilot hole. We offer you some tips and suggestions on how to get the best job from your tools, and we provide answers to your most-asked questions, as well.

Furthermore, we point you in the direction of some countersink drill bit sets that stand out from the crowd. High-speed steel: The cheapest countersink drill bit sets contain bits made from standard high-speed steel HSS. It's a proven material used for all kinds of cutting tools, and it forms the base for all types of countersink drill bits. It's excellent at cutting wood, as well as most plastics and composites.

It can also cope with aluminum and other soft metals, but it struggles with steel and cast iron because it tends to overheat and dull quickly. Heat treated: Standard HSS can be improved by heat treating, which results in a black oxide coating. These are less prone to rust and create less friction, which means greater efficiency. Cobalt: Another improvement on HSS is made by adding cobalt. This creates the hardest and strongest of all drill types.

TiN: Countersinks described as TiN use a titanium nitride coating a type of ceramic. They are usually gold colored. The drawback with TiN is that it's a coating rather than part of the metal.

When the drill bit wears out, it can't be resharpened or recoated; it has to be thrown away. Standard: These countersinks have a cone-shaped tip and cutting flutes that extend down the sides.

They are designed to countersink an existing drill hole. Variations on this type of countersink are available for drilling all materials. All-in-one: These countersinks have a hole in the middle that accepts a smaller diameter pilot drill bit, and often a depth stop.

If the pilot drill bit has a point and spur on the end, it's designed for woodworking only. Tapered: Some pilot drill bits are tapered, which it's claimed makes for faster, smoother drilling. Flutes: The drill bits usually have three or five flutes. A countersink drill bit with three flutes cuts more aggressively. If it has five, it cuts with less vibration, and so makes it easier to get a smooth finish. Shanks: These are round or hexagonal.

Round shanks are common on countersinks used for hard metals because they're designed to fit machine chucks though they fit other types, too. Hexagonal shanks fit all kinds of drills and may also be of the quick-release type. All-in-one sets: These should also contain a hex key, which is used to adjust depth stops or replace worn pilot drills the countersink part tends to last much longer.

Woodworking sets: These might also contain one or more plug cutters and perhaps a quick-release chuck adapter. Storage: It's nice to have a box to store the set in. It's not just a neat and convenient way to keep the drill bits, but if your countersink drill bits are banging around against other things in your toolbox, the cutting edges could be damaged.

In our opinion, there seems little point in trying to save a couple of dollars when you can get quality sets for a few dollars more. Premium: You might pay extra for titanium and black oxide coatings, though not a great deal. However, these are premium-quality, professional tools, so one of these sets is worth the investment if your work demands it.

Check the chamfer angle of your screw heads. In hardwoods, it can even weaken the screw head, and in extreme cases cause it to break. Mark the position with a center punch first when drilling holes in metals. Solid models are tapped gently with a hammer; spring-loaded models are simply pressed until they activate. Work out the required depth carefully when doing counterbores. Place your order at toolstation.

Your items will be held at your selected Toolstation branch for 14 days, after which point your order will be put back to stock and refunded automatically. Read reviews Catalogue page Add to trolley for Login to save for later.

Product Details Countersinks for steel and hard metals. Sizes: 10, 12 and 16mm. Delivery details. Items over 30kg can only be delivered next Business Day Mon-Fri.

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