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Easily calculate countersink depth online with our free Countersink Depth Calculator. Get quick results using the countersink diameter formula.
Ever noticed how some screws sit flush with wood or metal, while others stick out? That neat, flat finish comes from countersinking. Our Countersink Depth Calculator makes it simple to figure out the exact depth needed for a perfect fit.
Many people confuse it with sinks on a kitchen counter. But here, countersink means the conical hole that lets a screw head sit smooth on the surface. With our tool, you’ll get precise results without tough math.
Countersinking is the process of cutting a cone-shaped hole into a material. This allows the screw head to sit flat or just below the surface. The result is not only more attractive but also stronger and safer.
The countersink depth is the distance from the top surface down to the bottom of that cone. Measuring it right ensures screws don’t stick out or sink too deep.
The math behind it is simple. The formula uses the diameter of the hole and the angle of the countersink.
The formula is:
depth = (diameter / 2) ÷ tan(angle / 2)
Where:
Example:
If the diameter is 0.55 m and the angle is 75°, then:
depth = (0.55 ÷ 2) ÷ tan(75 ÷ 2)
depth = 0.358 m
Using the calculator is quick and easy.
The calculator will show you the exact depth. You’ll also see conversions in other units for convenience.
Think of it like a math tutor who does all the steps for you.
Getting the depth right matters for several reasons.
A screw that sits flush looks neat and professional. It prevents snags or scratches on surfaces. It also ensures the screw holds the material tightly without cracks or gaps.
If the depth is wrong, the screw might stick out or sink too far. That can weaken the joint or even strip the screw head.
It’s easy to mix them up. A countersink is cone-shaped. A counterbore, on the other hand, is flat-bottomed. Counterbores are used for socket head screws. Countersinks are for flush or beveled screws.
The Countersink Depth Calculator is a must-have for builders, woodworkers, and DIY fans. It saves time, avoids guesswork, and ensures perfect results every time.
Instead of scribbling formulas on paper, you can let the calculator do the heavy lifting. Try it out, and you’ll never misjudge a screw fit again.
Use this formula: depth = (diameter / 2) ÷ tan(angle / 2).
A countersink is cone-shaped, while a counterbore is flat-bottomed.
It depends on the screw size. The head should sit flush with the surface.
Yes. Enter your values, and you’ll see the depth in your chosen unit, plus others.