A countersunk screw, also known as a &#;flat-head screw,&#; sinks into a surface and rests flush in materials. Similar to other screws, a countersunk head screw has ridges that twist into a material to provide fastening power. Countersunk screws have a flat head instead of a rounded or semi-rounded one.
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If you&#;re a contractor, you know that countersunk screws are valuable in woodworking applications to prevent splitting, cracking, gouging and other problem areas. Use a countersunk screw when you want to hide fixtures and maintain the integrity of the material.
Countersunk screws have a wide range of applications. When you countersink screws, you completely bury the head beneath the fastening surface. This burying creates a flat surface that is ideal for many different projects.
One of the most common uses for countersunk screws is securing door frames. Other screw types would protrude from the frame, causing ongoing stress between the door and the frame. Countersinking screws create that flush surface that ensures smooth contact between the frame and the door, helping both pieces function and last for the long term.
Countersunk screws are often found in woodworking and joining applications. The flush surface is excellent for applying screws on items that need to be functional surfaces, like tables and shelving. Countersunk screws can also make it easier to fasten one piece to another even further. While other screws will reach a natural stopping point, countersunk screws can protrude deeper.
Once you know how to countersink screws, you can also enjoy the benefits of finer aesthetic quality. Unlike other types of screws, it&#;s easy to cover a countersunk screw with a cap or filler that makes the surface sleeker. This capability is especially helpful in furniture making, where fasteners can disrupt the visual quality of a piece.
The sizes for a countersunk screw vary. The best way to determine size is to measure the threaded part of the screw with calipers. Based on that measurement, you can then select a slightly smaller drill bit to create a pilot hole.
The most common countersink angle for screws is 82 degrees based on the Unified Thread Standard. Countersinks, or tools with a cone-shaped end for modifying an existing pilot hole, are available with various angles to match a particular screw&#;s head angle.
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A countersink drill lets you countersink screws with two different bit options. Fluted bits require two bits to make a pilot hole and a countersink hole. Combination bits can create both holes at once.
With a fluted bit, you use a regular drill bit to make a pilot hole and a second fluted bit to make a recessed area in the shape of a &#;V&#; for the screw. The steps involved are as follows:
Using a combination bit, you can make a countersink in less time, with less effort. These tools combine steps two and three together to streamline the process.
Bookshelves, bed frames and other furniture looks better with countersunk screws. For a clean and professional look, talk to an expert about countersunk screw options today. Reach out to our service team online or give us a call at 800-483-.
Head Screw Lady Since ! Specializing in breaking down the language barrier between suppliers and end users. During her 35 years working in the fastener industry, MaryLouise has worked directly with end users, contractor&#;s, OEM&#;S and DIY, as well working within the import industry, working with fastener manufacturers and distributors. This has given her the unique perspective of having the technical knowledge needed to perform in the fastener world but also be familiar with the needs of end users who don&#;t necessarily know the fastener jargon or applications to know exactly what they need for their jobs.
Stan said:
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Well if you used the spotting drill as the countersink, the hole is countersunk first, and so your touch off is against a flat surface and will be easier.RE how much less holding strength? It will certainly be somewhat less, but one wonders about it being "very little". After all, Machinery's Handbook says the spec on the bolt head itself allows a variation of 78 to 82 degrees. So an 82 degree countersink is pinned at the high end of the range. This makes me think a couple of things. First, if that much difference is allowable without changing the spec of what the bolt is supposed to be capable of, an extra 8 degrees at the other end probably won't be the end of the world. Second, it's evidently more desirable for the countersink to have a greater angle than the bolt head, hence if I didn't have an 82, I'd rather a 90 than a 60.And speaking of 60's, Machinery's Handbook says you should slightly chamfer the bolt clearance hole with a 60 degree tool to account for the slight radius between the socket head cap screw and the threaded portion of the bolt. Learn something new every day!While I was looking through the Handbook, I saw all kinds of angles. As Tim, and then Brian said, metric is 90. But, Instrument screws in Imperial, for example, are also 90 degrees. Seems like the sort of thing a fellow who worked on small engines might possibly come across. There were a number of others, and all had a range of angles within which the bolt was "in spec."I even went over to Practical Machinist and had a look around. One group of fellas opined as how most aerospace work uses 100 degree screws. They hold better on thin aircraft skins. As Stan mentions and as the Handbook mentions, more angle = better for thin stuff. Kinda makes you wonder about metric when small fasteners are involved because you have 90 instead of 82.Times like this it sure is handy to have a grinder and the ability to make the tool do whatever angle you'd like. ;DCheers,BW
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