Understanding Bolt Circle Calculations
This calculator determines the X, Y coordinates of bolt holes in a circular pattern based on the number of bolts, bolt circle diameter, rotation angle, and center coordinates, supporting imperial and metric units.
The coordinates are calculated using polar-to-Cartesian conversion, with bolts equally spaced around the circle. This is useful for designing flanges, wheel hubs, or other mechanical assemblies.
Example Bolt Circle Coordinates
| Bolt Number | X Coordinate | Y Coordinate | Scenario |
|---|---|---|---|
| Bolt 1 | 5.00 in. | 0.00 in. | 4 bolts, 10 in. diameter, 0° rotation |
| Bolt 2 | 0.00 in. | 5.00 in. | Center at (0, 0) |
| Bolt 3 | -5.00 in. | 0.00 in. | Equally spaced |
| Bolt 4 | 0.00 in. | -5.00 in. | Imperial units |
How to Use the Bolt Circle Calculator
- Select the unit system (imperial or metric).
- Enter the number of bolts (e.g., 4).
- Specify the bolt circle diameter (e.g., 10 in. or 254 mm).
- Enter the rotation angle (degrees) and center coordinates (X, Y).
- Click "Calculate Bolt Coordinates" to view the X, Y coordinates of each bolt hole.
Bolt Hole Locations
Visualization of bolt hole coordinates on the bolt circle.
Frequently Asked Questions
What is a bolt circle?
A bolt circle is a circular pattern of bolt holes, defined by a diameter and number of bolts, used in mechanical assemblies like flanges or wheel hubs.
What does the rotation angle do?
The rotation angle shifts the position of the first bolt from the positive X-axis, affecting the angular position of all bolts.