How to Choose the Right Drill Bit Size for Bolts

Learn how to select the proper drill bit size for your bolts to ensure a perfect fit.

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Choose a drill bit size that matches the nominal diameter of your bolt for a snug fit. For standard bolts, use the same size drill bit as the bolt shaft (excluding the threads). For tap bolts and threading applications, refer to a tap drill chart to determine the appropriate size.

FAQs & Answers

  1. What is the standard drill bit size for a bolt? The standard drill bit size matches the nominal diameter of the bolt shaft, excluding threads.
  2. How do I find the right drill size for tap bolts? Refer to a tap drill chart to determine the appropriate drill bit size for tap bolts.
  3. Can I use the same drill bit for different sizes of bolts? No, each bolt size requires a specific drill bit to ensure a snug fit.

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