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Calculate thread pull out force easily online. Use our fast, accurate Thread Pull Out Force Calculator for steel, aluminum & metric threads.
If you've ever wondered how much force a threaded connection can handle before it strips or fails, you're in the right place. The Thread Pull Out Force Calculator is a simple online tool we developed to help engineers, mechanics, DIYers, and students accurately calculate the thread pullout strength of bolts and screws in various materials like steel, aluminum, or plastic.
With support for both imperial and metric units, and multiple calculation methods including NASA, stress-area-based, and ISO standards, this calculator makes the task easy, fast, and accurate.
Thread pull out force is the maximum force that can be applied to a bolt or screw before the threads strip or fail by pulling out from the material. This type of failure often happens when the threads of the weaker material (typically the female side) can no longer resist the shear stress caused by the fastener under load.
Understanding this force is crucial in applications where safety and durability are important, such as in automotive, aerospace, construction, or machine design.
There are several accepted formulas for calculating thread pullout strength. Each depends on the accuracy needed and the material involved.
P = π × d × Fs × L / 3
Where:
This formula includes a built-in safety factor of 3. It's ideal for quick and conservative estimates.
P = (As × S) / SF
As = Factor × π × d × L
Where:
This method allows for a customizable safety factor and is widely used in engineering calculations.
P = 0.5 × π × d × L × τ
Where:
This formula is highly accurate and used in critical applications following ISO standards.
Using our calculator is simple and requires just a few steps:
Step 1
Enter the thread diameter (in mm, cm, or inches).
Step 2
Enter the length of thread engagement in your preferred unit.
Step 3
Input the shear strength of the weaker material (like aluminum or plastic).
Step 4
Select the calculation method you want to use: NASA, stress-area based, or ISO standard.
Step 5
Choose your input and output units, including lbf, N, kN, and kgf.
Step 6
Click “Calculate” and get your thread pull out force in multiple units instantly.
The tool will also show you the exact formula used for full transparency.
This calculator is perfect for:
Whether you're calculating pull out force for a steel bolt or checking thread strength in 3D printed plastic, this calculator simplifies everything.
Our Thread Pull Out Force Calculator is designed to be both accurate and user-friendly. It supports metric and imperial units, includes three standard methods, and converts results into multiple formats. Whether you're working with steel, aluminum, or composite materials, this calculator gives you the numbers you need fast.
Don’t waste time doing complex hand calculations. Use our tool to calculate thread stripping strength with confidence.
You can calculate thread pullout force using the formula:
P = π × d × Fs × L / 3
This is the NASA-based method and includes a built-in safety margin.
Stripping force is another term for pull out force. It’s calculated by multiplying the shear area of the threads by the material’s shear strength and dividing by a safety factor.
Yes, the calculator supports metric inputs like mm, cm, and converts them to inches internally for calculation.
Absolutely. Just input the shear strength of aluminum (typically around 20,000 psi) and the rest of the calculation will work the same.
Yes. The NASA method uses a built-in factor of 3, and the stress-area method lets you choose your own.