Craft & DIY
Threaded Rod Load Calculator
Estimate the allowable tensile load of a threaded rod based on diameter and strength class.
The allowable tensile load of a threaded rod depends on its diameter and strength class. This calculator uses a simplified approximation via the stress cross-section.
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Allowable working load
Pro tips
- Consult a structural engineer for load-bearing or safety-critical applications.
- A safety factor of 3-4 against breaking load is common practice.
All calculations are non-binding estimates provided without guarantee. For safety-relevant decisions (e.g. pool chemistry), please consult a professional.
Frequently Asked Questions
How much tensile load can a threaded rod hold?
It depends on diameter and strength class – an M8 rod in class 8.8 holds noticeably more than an M6 rod in class 4.6.
What does the strength class mean for threaded rods?
The strength class (e.g. 4.6, 8.8, 10.9) indicates the steel's tensile strength – the higher the number, the more load the rod can bear.
What are threaded rods typically used for?
For ceiling suspensions, timber-frame connections, machine mounts, or as anchor rods in concrete construction.
Should I plan a safety factor for the tensile load?
Yes, for load-bearing or safety-relevant applications, always plan a clear safety margin below the calculated breaking load.