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Easily calculate bolt pull-out force with our Bolt Pull Out Force Calculator. Get accurate results in lb-f, N, and kN for different materials instantly!
When fastening bolts into different materials, it's essential to know how much force they can withstand before pulling out. This is crucial in engineering, construction, and mechanical applications where safety and durability matter. Our Bolt Pull Out Force Calculator helps users determine the maximum force a bolt can handle before failing. By entering the bolt diameter, embedded length, and material bond factor, you can instantly get results in pounds-force (lb-f), Newtons (N), and kilonewtons (kN).
Bolt pull-out force is the amount of force required to remove a bolt from a material it is fastened into. It depends on factors such as:
When a bolt is secured in place, it resists pulling forces due to friction and material bonding. However, if the force exceeds a certain limit, the bolt will either pull out or shear off. This is why calculating bolt pull-out strength is necessary for structural integrity.
The general formula for bolt pull-out force is:
Fpo = π × D × L × MF
Where:
This formula considers the surface area of the bolt in contact with the material and the strength of the bonding material. The result is given in pounds-force (lb-f).
To convert into Newtons (N) and kilonewtons (kN):
Let’s say we have a bolt with:
Using the formula:
Fpo = π × 0.5 × 2 × 600
Fpo = 3.1416 × 0.5 × 2 × 600
Fpo = 1884.96 lb-f
Now, converting to Newtons and kN:
Fpo (N) = 1884.96 × 4.44822 = 8,384.93 N
Fpo (kN) = 8,384.93 ÷ 1000 = 8.38 kN
| Material Type | Bond Factor (psi) | Example Pull-Out Force (lb-f) (0.5" D, 2" L) |
|---|---|---|
| Epoxy to Concrete | 600 | 1,884.96 lb-f |
| Epoxy to Steel | 1600 | 5,026.57 lb-f |
| Aluminum | 1000 | 3,141.59 lb-f |
| Softwood | 300 | 942.48 lb-f |
Different materials have different bond strengths, which affect the final pull-out force value.
The Bolt Pull Out Force Calculator is an essential tool for engineers, construction workers, and anyone dealing with fasteners. By calculating the pull-out strength, you can ensure the reliability and safety of your structures. Whether you're securing bolts in concrete, aluminum, or steel, knowing the exact pull-out force helps prevent failures.
If you're wondering how much force it takes to shear a bolt or how to calculate thread stripping force, our calculator provides precise answers based on real engineering formulas.
The pull-out strength is calculated using the formula Fpo = π × D × L × MF, where the bolt diameter, embedded length, and material bond factor determine the force required to remove the bolt.
Shear force depends on the bolt's material, diameter, and the type of load applied. Generally, shear strength is about 60% of tensile strength. A shear strength calculator can give precise values.
Yes, you can use the calculator for aluminum bolts by selecting a custom bond factor that matches aluminum’s bonding strength.
The calculator allows input in inches (in) and millimeters (mm) and provides results in lb-f, N, and kN.
Yes, surface preparation significantly impacts the bonding quality. A rougher surface improves adhesion, increasing pull-out strength.