Depth of Thread Calculator

Easily calculate thread depth with our Depth of Thread Calculator. Get quick and accurate results in metric and inches.

Thread depth is how deep a screw thread goes into a surface. It helps ensure a tight and secure fit. If the depth is wrong, the screw might be too weak or too tight to work properly.

You’ll often need to calculate this for bolts, nuts, and threaded holes. Our Depth of Thread Calculator makes it quick and easy. Just enter the values, and you’ll get accurate results in seconds!

How to Calculate Thread Depth

There’s a simple formula for this:

Theoretical Depth (H) = 0.866 × Pitch

For practical use, we adjust it slightly:

Practical Depth (h) = 0.65 × Pitch × (Depth Percentage/100)

Where:

Pitch = Distance between threads
H = Theoretical maximum depth
h = Adjusted depth for real-world use

Example Calculation

Let’s say you have a 1.5 mm pitch thread:

Theoretical Depth = 0.866 × 1.5 = 1.299 mm
Practical Depth (100%) = 0.65 × 1.5 = 0.975 mm

If you reduce the depth to 75%, the new value is 0.731 mm.

Using the Depth of Thread Calculator

Our tool is user-friendly! Just follow these steps:

Enter the thread pitch (in mm or inches).
Select the unit of measurement.
Adjust the depth percentage if needed.
Click Calculate – and get instant results!

Depth of Thread Chart

This table shows standard thread depths for different pitches.

Thread Pitch (P)	Theoretical Depth (H)	Practical Depth (100%)	Practical Depth (75%)
1.0 mm	0.866 mm	0.65 mm	0.487 mm
1.5 mm	1.299 mm	0.975 mm	0.731 mm
2.0 mm	1.732 mm	1.3 mm	0.975 mm
10 TPI (inch)	0.0866 in	0.065 in	0.0487 in
16 TPI (inch)	0.0541 in	0.0406 in	0.0304 in

Why Does Thread Depth Matter?

If the depth is too shallow, the screw may loosen. If it’s too deep, it can weaken the structure. Getting the right balance ensures safety and durability.

Final Thoughts

Threads hold things together literally! Our Depth of Thread Calculator makes it easy to get the right depth every time. Whether you’re a machinist, engineer, or DIY enthusiast, this tool saves time and effort.

FAQs

How do I measure the depth of a thread?

Use a thread gauge or a bolt to check how deep it fits into the hole.

What’s the formula for single-thread depth?

The simple formula is H = 0.866 × Pitch.

Does this work for metric and inch threads?

Yes! The calculator handles both.

Why is my thread depth lower than expected?

Most threads are cut slightly shallower for better strength.

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