Countersink Depth Calculator
Calculate precise countersink depth, screw head seating depth, and drill dimensions for woodworking, metal fabrication, and CNC machining projects.
Calculate Countersink Depth
What Is Countersink Depth?
Countersink depth refers to the depth of a conical hole drilled so that a screw head sits flush or below the surface. It is widely used in woodworking, metal fabrication, and precision engineering.
Proper countersinking improves surface finish, prevents protruding screws, and enhances structural safety.
Why Accurate Countersink Depth Matters
- Ensures flush screw seating
- Improves surface finish quality
- Prevents material cracking
- Enhances structural strength
- Improves professional workmanship
Common Countersink Angles
| Angle | Application |
|---|---|
| 82° | US standard screws |
| 90° | Metric fasteners & general use |
| 100° | Aircraft and aviation hardware |
How to Use This Tool
Step 1
Enter the screw head diameter in millimeters.
Step 2
Input the hole diameter and countersink angle.
Step 3
Select the material type for reference purposes.
Step 4
Click the calculate button to get precise countersink depth.
Applications
- Woodworking and cabinetry
- Metal fabrication
- CNC machining
- Aircraft and automotive assembly
- Furniture manufacturing
Frequently Asked Questions
Why is countersinking important?
It ensures screws sit flush with the surface, improving both appearance and safety.
What is the most common countersink angle?
82° and 90° are the most commonly used angles in industrial and woodworking applications.
Can this be used for wood and metal?
Yes, the same geometry applies, but material properties affect drilling technique.
