The Ultimate Tap Drill Size Chart for Inch Measurements

When it comes to fastening, having the right tap drill size chart is crucial to ensure a strong and secure hold. In this article, we'll delve into the world of tapping and provide you with a comprehensive guide on tap drill sizes in inch measurements.

Strength of Tapped Holes

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Before we dive into the chart, it's essential to understand the strength of tapped holes. Tests have shown that any increase over 60% of thread for the tapped hole does not increase static strength of fastening. This means that exceeding this percentage can compromise the integrity of the fastening process.

Tap Breakage

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When encountering difficulties or breakage while tapping, it's crucial to check the drill size in relation to the material hardness and ensure the tap is sharp. Small drills (1/8″ and under) are particularly prone to breaking when not run at high speeds.

Difficulty in Drilling

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If starting a drill is difficult, thinning the web of the drill at the point can solve this problem. This simple adjustment can make all the difference in ensuring a smooth drilling process.

Class of Fit

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Most commercial bolts and screws are made to fit 2A external thread standards, which fit with 2B tapped threads. Understanding these classes is vital to selecting the correct tap drill size for your specific application.

Tapping Blind Holes

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When tapping blind holes, it's essential to drill the hole deep enough to accommodate chips. This prevents any debris from accumulating and potentially compromising the fastening process.

Inch Tap Drill Size Chart

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Below is a comprehensive inch tap drill size chart that covers various materials, including steel, aluminum, copper, and copper alloys:

* Free Cutting Metals: 65-75% of thread

* Hard or Rough Materials: 60-70% of thread

This chart provides a detailed guide on the recommended tap drill sizes for different materials. Whether you're working with steel, aluminum, or copper, this chart has got you covered.

Additional Resources

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In addition to this inch tap drill size chart, we also provide other valuable resources to help you in your fastening endeavors:

* Metric Fine Flexible Magnetic Sheet & Drill

* Keyway Dimensions

* Melting Points

* O-Ring Sizes

* Pipe Threads

* Screw Extractors

* Sheet Metal Gauges & Weights

* Socket Head Cap Screws

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In conclusion, selecting the right tap drill size is crucial for ensuring a strong and secure fastening process. By understanding the strength of tapped holes, overcoming common difficulties, and using the correct class of fit, you can achieve optimal results. Whether you're working with inch or metric measurements, our comprehensive guide has provided you with the tools to succeed.

Remember to always refer to this article for guidance on tap drill sizes in inch measurements. With this chart, you'll be well-equipped to tackle any fastening task that comes your way.

Tap drill size chart inch