Countersink size chart

Not only does this practice add to the overall appearance, but certain wood projects require a perfectly smooth surface.

countersink size chart

When referencing the chart, keep in mind that we chose sizes that would accommodate the most common screw head diameters. Thus, screws with a narrower head may want to consider a smaller size. Likewise, abnormally large screw heads may need extra room to accommodate their width. If in doubt, go with the recommended size. Unlike pilot holescountersink holes cannot afford to run on the tight side. Given all the different types of screw heads and wood species, pinpointing a single depth for each countersink hole is impossible.

Thus, you will need to adjust the depth of your countersink holes to accommodate your given circumstances. The reason being is that less-dense wood species will compact upon pressure from the screw, which allows for the head to push in. On the other hand, denser hardwoods are much more stubborn and require the area for the screw head to be completely cleared. Most people skip the countersink hole to save time. However, this often results in lower quality work and increases the likelihood of an error.

To keep countersink holes in your process, consider drilling them all at once. Swapping out different drill bits is time consuming so streamlining the countersinking step will save you time.

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Also, drilling a countersink hole will allow for the screw to enter more smoothly. View it on Amazon.

countersink size chart

You must log in to post a comment. Toggle navigation. Referencing Our Countersink Chart When referencing the chart, keep in mind that we chose sizes that would accommodate the most common screw head diameters. Determining the Depth of Each Countersink Hole Given all the different types of screw heads and wood species, pinpointing a single depth for each countersink hole is impossible. Recommended Tools for Countersinking Wood Screws:.

Socket Head Cap Screw Size Chart

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Metric Countersunk Hole Dimensions Chart

This chart below is designed to help you get the proper set-up for using a countersink and match it with either a Taper Point bit or a Straight bit. First you must select the Screw Size that you are working with down the Left side of the chart. Then find the corresponding column as you decide upon a Tapered or Straight Drill bit and whether the wood is a hardwood or a softwood.

Fuller Countersink Set Fuller Countersink Set 8. Fuller Countersink SET 6. Fuller Countersink set 9. My Account.

Pilot Holes, Clearance Holes & Countersinks

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Jamestown Distributors Sign in to your account. New customer? Start here. Item s in your cart: There are no items in your cart. All Categories.CounterSink Depth Calculator. JanProducts gives no warranty, express or implied, as to the accuracy, reliability and completeness of any information, formulae or calculations provided through the use of these calculators and does not accept any liability for loss or damage of whatsoever nature, which may be attributable to the reliance on and use of these calculators.

This will calculate the z depth to enter for a given diameter and angle of countersink. The actual cut dimension will probably be more after cutting due to the countersink point on the tool is usually not perfect causing the tool to cut deeper. So be sure to adjust your numbers so as not to cut too deep. Check out our Coolant Pulse Program. Or our Tapping Edit program. Copyright Countersink depth calculator Calculates theoretical point depth with dimension given in diameter Enter major diameter of countersink and angle Diameter of countersink Included angle Answer:.

Countersink Calculator This will calculate the z depth to enter for a given diameter and angle of countersink.We may receive a commission when you use our affiliate links. However, this does not impact our recommendations. When assembling cabinet parts using screws, drilling a clearance hole with a countersink is a necessity. A pilot hole for the screw may or may not be necessary at all. A clearance hole will allow a screw to pass through it without the threads biting into the material.

This is particularly important when using screws with threads that are formed on the entire length of the screw shank, as with drywall screws. A pilot hole, on the other hand, makes room for the screw shank yet provides material for the screw threads to thoroughly bite into the material securing the fastener. The pilot hole is necessary when the threat of splitting the material is likely. And the countersink, of course, allows the screw head to seat flush or below the face of the material. The ideal drill bit for making all these required elements for fastening two pieces of wood together is very difficult to make and therefore not readily available.

A variation of the step drill is the tapered bit, and the variables for such bits are many. What type and size screw are you using, what length is it, how thick is the material in use and how deep can you sink the screw? This can be a very important. Of course, without a proper-sized clearance hole the ability to draw the first piece of material tight to the second is compromised.

An exception is when the two pieces are clamped before the screws are inserted. Without the appropriate-sized step or tapered drill bit, the clearance hole trumps the pilot hole.

Furthermore, drilling a clearance hole, then drilling a pilot hole in a second operation, is often problematic because of the difficulty of precisely locating the pilot hole. A less than perfectly placed pilot hole will lead to alignment issues between the parts.

In most cases, I drill a clearance hole then drive the screw without benefit of a pilot hole. Exceptions, of course, are if the material is too hard to drive a screw without fear of snapping the screw or if the screw is too large in size to drive into softer materials with snapping concerns or perhaps splitting the wood.JavaScript seems to be disabled in your browser. For the best experience on our site, be sure to turn on Javascript in your browser.

Countersink bits come in a variety of stiles and sizes depending on the project, the screws you're using, and personal preferences. 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 tears the wood surface fibers and looks terrible. In hardwood, you might not even be able to set the screw flush. This is where countersinking or its close relative, counterboring come in.

When you top off a pilot hole with a countersink, the screw head seats perfectly: all its surfaces contact the wood with the same amount of force, making for a strong attachment and a clean look. You can hide your flat-head screws with wood plugs if you drill your countersink deep enough to allow for them to be glued in over the screw.

When we want those screws to disappear entirely, a properly sized deep-drilled countersink can accept a wooden plug that can then be cut and sanded flush for a smooth surface and an accented appearance.

Handling these tasks, and more, is the job of a dedicated countersink. But there are a lot of them out there: one piece or a combination of drill bit and countersink, single-fluted or with multiple flutes or none at all and a wide range of chamfer angles make for tricky selection. As with just about all woodworking tasks, countersinks work best when correctly matched to the job at hand.

Fluted bits have one or more cutting edges, cross-hole countersinks have an angled hole in the tip which acts as the cutting edge. One-piece countersinks come in two main flavors, the most commonly recognized being a fluted countersink, which has a short shank with an elongated cylinder topped with a conical tip.

The shape always reminds me of the old Apollo command module. The most typical fluted countersink used to have four cutting edges on the cone, although one-piece fluted countersinks today more commonly have an odd number of cutting edges — usually one or five. Fluted countersinks come in several sizes, able to cut conical holes intended to fit screws of varying head dimensions. A pilot hole is first drilled for the screw, followed by countersinking the hole to allow a flat-head screw to seat flush with the work surface.

A fairly recent type of one-piece countersink called a cross-hole countersink has no flutes. Instead of sharpened cutting edges, the bit has a hole bored through the cone at an angle.

As the bit spins, the trailing edge of the hole makes the cut. Used the same way as fluted bits pilot hole first, countersink secondcross-hole countersinks cut very smoothly and remove material quickly, and they excel at ejecting chips as they drill. These drill bits generally cost a bit more than their fluted cousins. However, both standards of countersinks are readily available here.

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Well, that depends. The screw must be further tightened to bring the rest of the head into contact with the countersink, creating a greater force on the wood at the bottom. Common sense will tell you that matching the screw to the countersink is the correct way to go. This is especially true with hardwood, as forcing the screw tighter in an effort to properly seat the screw into the countersink puts a lot of stress on the head — try it with a brass screw, and the head will likely snap off.

For hardwood, matching the countersink is always best. However, a wide variety of combination countersinks do both tasks at the same time. Going by several names — countersink drills, pilot screw countersinks and piloted countersinks are just a few — these bits wrap a fluted countersink around an adjustable drill bit. It's rare to find the old-style flat steel piloted countersink bitsbut they are great for drilling countersinks quickly if inefficiently.Forum Rules.

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Newbie Tool Tip: Countersink Drill Bits

Login to Your Account. Remember Me? Register Forgot password? What's New? Results 1 to 15 of Thread: Countersink standards. Thread Tools Show Printable Version. Countersink standards Hi All, When you have to drill a hole and countersink for a particular flat head screw or drill and counterbore for a particular bolt, where do you find the standards to go by.


I can't seem to find it in my machinist handbook. Is there a website that has a good reference? It is in my Machinery's Handbook. Try looking again.

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I find it in the index under "cap screws". May seem Old Skewl, but never had it fail for me yet. Holo-krome sells a carboard slide-rule type calculator that has all sorts of dimensional info for various types of fasteners.

Join Date Feb Location Mi. Originally Posted by Ox. Originally Posted by Limy Sami. Knowing the general crap standard of hardware these days I asked for a definite size, which after a bit of umming and aaahing I got. Did job to spec, inc csks, which was isnspected and passed, Originally Posted by Spence.

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countersink size chart

I agree to receive emails from Practical Machinist containing industry news and updates from Practical Machinist and its sponsors. You may unsubscribe at any time.A countersink is a tapered hole drilled with a wide outer portion. A common usage of the countersunk hole is to allow the head of a flat head bolt or screw, when placed in the hole, to sit flush with or below the surface of the surrounding material.

A Countersunk Hole is made with use of a drill bit and treating a laser cut hole with the bit to taper out the countersink. Unless otherwise specified, countersunk holes are of a diameter 0.

Countersunk Hole Treatment Countersunk Holes A countersink is a tapered hole drilled with a wide outer portion. Proper hole size and countersink size for screws. Sheet Metal Fabrication. Metal Spinning. Custom Metal Machining. Prototype Metal Parts. Metal Material Guide.

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