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Clearance Hole Calculator

Provided byOmni Calculatoromnicalculator.com

The clearance hole calculator helps you to quickly calculate the diameter of a hole through an object or substrate fo...

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About this tool

What Clearance Hole Calculator does

A clearance hole is a hole drilled through a substrate that allows the threads of a screw or bolt to pass through without biting into the material. This tool calculates the necessary diameter of that hole. You input the fastener's thread diameter and head diameter, and the calculator outputs the clearance hole diameter. The result is useful for DIY builds and furniture installation, ensuring the screw passes through the material cleanly. The site provides the formula CH = (DF + DH) / 2, where DF is the fastener diameter and DH is the head diameter, and allows you to choose between metric and imperial units. It also references related tools like pitch diameter and bolt torque calculators, and mentions clearance hole charts for checking standard sizes.

Step by step

How to use the Omni Calculator Clearance Hole Calculator

  1. 1

    Enter the fastener's thread diameter

  2. 2

    Enter the fastener's head diameter

  3. 3

    Select preferred units (metric or imperial)

  4. 4

    View the calculated clearance hole diameter

  5. 5

    Use the share result feature to export or save the output

Is it right for you

Best for

DIY enthusiasts and builders who need to quickly determine the correct hole size for screws or bolts without manually calculating or referencing charts.

Limitations

  • Results are estimates based on input diameters
  • No automatic unit conversion between metric and imperial
  • Does not account for material thickness or specific fastener standards
Questions

Clearance Hole Calculator FAQ

How do I calculate a clearance hole manually?
Add the fastener diameter and the fastener head diameter, then divide the sum by two. The formula is CH = (DF + DH) / 2.
Can I use this calculator for both metric and imperial fasteners?
Yes, the calculator allows you to choose between metric and imperial units for the input diameters.
What if I only know the screw size, not the exact diameters?
You will need the specific thread diameter and head diameter for accurate results; the calculator requires these two measurements as inputs.
Does the tool provide standard clearance hole sizes for common fasteners?
The site mentions clearance hole charts that show standard sizes, but the calculator itself computes a custom value based on your specific fastener dimensions.
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