Construction

Countersink Depth Calculator

Find the depth to cut a countersink.

Calculated Output

Depth 0.5752

Formula: depth = (diameter/2) ÷ tan(angle/2)

Step-by-Step Breakdown

1. Values used:

2. Countersink diameter = 1

3. Included angle = 82 degrees

5. Depth = 0.5752

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The math behind it

depth = radius ÷ tan(half the included angle). A 82° flathead screw is standard.

0.375 in screw head, 82° → ~0.21 in deep.

Different angles?

Metric flatheads are often 90°; aircraft use 100°.