Clearance Hole Diameter Calculator
This table will list standard screw sizes (e.g., metric M-series) and the corresponding nominal hole diameters for clearance (loose and close fits).
Here’s an example table that includes typical sizes and their clearance hole diameters for both close and loose fits:
Example of Clearance Hole Diameter Table:
| Screw Size (Metric) | Close Fit Diameter (mm) | Loose Fit Diameter (mm) |
|---|---|---|
| M2 | 2.2 | 2.4 |
| M2.5 | 2.7 | 2.9 |
| M3 | 3.2 | 3.5 |
| M4 | 4.3 | 4.5 |
| M5 | 5.3 | 5.5 |
| M6 | 6.4 | 6.6 |
| M8 | 8.4 | 9.0 |
| M10 | 10.5 | 11.0 |
| M12 | 13.0 | 13.5 |
| M16 | 17.0 | 18.0 |
| M20 | 21.0 | 22.0 |
Explanation:
- Screw Size (Metric): This column lists the nominal diameter of the screws in millimeters, typically using the metric designation (e.g., M2, M3, etc.).
- Close Fit Diameter (mm): The diameter for a close fit clearance hole. This provides a tighter fit between the screw and the hole, useful where alignment is crucial and less play is desired.
- Loose Fit Diameter (mm): The diameter for a loose fit clearance hole. This allows for more play between the screw and the hole, which can be helpful in applications where alignment is less critical or when temperature changes might cause expansion.
How to Use the Table:
To use this table, determine the nominal screw size you are working with, then select the appropriate hole diameter based on the type of fit you need—close or loose. For example, if you’re using an M6 screw and want a close fit, you’d drill a hole with a diameter of 6.4 mm.
This table is based on general engineering practices and may need to be adjusted for specific materials or application requirements. Always refer to detailed engineering data and standards (like ISO or ANSI) when precision is critical.