1. What is the Clearance Hole Formula?

The clearance hole formula calculates the recommended hole size for steel bolts to allow for proper assembly while maintaining structural integrity. The standard formula adds 1/16 inch to the bolt diameter.

2. How Does the Calculator Work?

The calculator uses the standard clearance hole formula:

Where:

• \( CH \) — Clearance hole diameter (inches)
• \( \text{bolt\_dia} \) — Nominal bolt diameter (inches)
• \( \frac{1}{16} \) — Standard clearance allowance for steel bolts

Explanation: The formula ensures the hole is large enough for easy bolt insertion while maintaining sufficient material for proper load transfer.

3. Importance of Proper Clearance Holes

Details: Correct clearance holes prevent binding during assembly, allow for minor misalignment, and reduce stress concentrations in the connected parts.

4. Using the Calculator

Tips: Enter the nominal bolt diameter in inches. The calculator will add the standard 1/16" clearance and display the recommended hole size.

5. Frequently Asked Questions (FAQ)

Q1: Does this formula work for metric bolts?
A: No, this is specifically for imperial-sized bolts. Metric bolts typically use different clearance standards.

Q2: When would I need a different clearance value?
A: For precision fits, high-vibration applications, or when using different materials, you may need adjusted clearances.

Q3: Is this clearance appropriate for all bolt grades?
A: Yes, this is a general standard that works for most steel bolt grades (Grade 2, 5, 8, etc.).

Q4: What about clearance for nuts?
A: Nuts typically use the same clearance as their corresponding bolt size.

Q5: How precise should the hole be drilled?
A: Standard practice is ±1/64" tolerance for most applications.