How To Calculate Bolt Spacing

Bolt Spacing Formula:

\[ \text{Spacing} = \text{Pitch Circle Diameter} \times \sin\left(\frac{180°}{\text{Number of Bolts}}\right) \]

Bolt Spacing:

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1. What is Bolt Spacing?

Bolt spacing refers to the distance between adjacent bolts in a circular pattern. It's crucial for ensuring proper load distribution and structural integrity in bolted connections.

2. How Does the Calculator Work?

The calculator uses the bolt spacing formula:

\[ \text{Spacing} = \text{PCD} \times \sin\left(\frac{180°}{\text{Number of Bolts}}\right) \]

Where:

\( \text{PCD} \) — Pitch Circle Diameter (mm)
\( \text{Number of Bolts} \) — Total bolts in the pattern

Explanation: The formula calculates the chord length between two adjacent bolts on the pitch circle.

3. Importance of Bolt Spacing Calculation

Details: Proper bolt spacing ensures even load distribution, prevents overloading of individual bolts, and maintains the structural integrity of the assembly.

4. Using the Calculator

Tips: Enter the pitch circle diameter in millimeters and the number of bolts in the pattern. Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is Pitch Circle Diameter (PCD)?
A: PCD is the diameter of the circle that passes through the center of all bolt holes.

Q2: Does this formula work for any number of bolts?
A: Yes, it works for any number of bolts ≥2 arranged in a circular pattern.

Q3: How accurate is this calculation?
A: The calculation is mathematically precise for ideal circular patterns.

Q4: Can I use this for non-circular patterns?
A: No, this formula is specifically for circular bolt patterns.

Q5: What units should I use?
A: The calculator uses millimeters, but you can use any unit as long as you're consistent.