Bolted Joint Calculator

This tool performs the fundamental design checks for preloaded bolted joints. From the entered geometry, materials and loads it calculates the required preload, the stiffness balance, thermal clamp loss, separation and slip margins, and bolt and bearing stresses. Each criterion is compared against its limit and the results are presented in a table.

Runs in your browser; your data never leaves your device.

1 · What do you want to do?

Pick the scenario matching what you have; the inputs adapt accordingly.

2 · Define the joint

Dashed fields are auto-derived; override them if you wish.

Bolt & pattern

Clamped members

Loads & tightening

3 · Result

Updates instantly with every input.

Safety checks

Joint cross-section & bolt pattern

Load sharing & stiffness balance

Temperature effect and clamp change

Detailed margin table (Normal · Limit · Ultimate)

Contact us to access the full version of this tool, which evaluates multi-axis load combinations, temperature sweeps and Limit/Ultimate margins; to obtain validated enterprise solutions tailored to your own joints and load scenarios; or to have custom tools developed for similar mechanical design and calculation needs.

✉ info@mechapoint.engineering 🌐 www.mechapoint.engineering

This tool is built on the internationally accepted analysis systematics for preloaded bolted joints (VDI 2230 approach; NASA-STD-5020 criteria framework), configured for a common case: a circular bolt pattern, an axial separating load and/or a torque-induced transverse (slip) load, a single fastener type and clamped members acting in series. The calculation core has been verified against a high-temperature reference case and an automated suite of ~4,000 scenarios. Real situations departing from these assumptions (eccentric/prying loads, gasketed sealing joints, multi-axis load combinations, fatigue assessment, etc.) require joint-specific treatment; material values are representative. Acceptance targets (margin thresholds) are configurable defaults based on common engineering practice. The tool is intended for capability demonstration and preliminary assessment; it may contain errors, omissions and, in some cases, software defects, and must not be relied upon alone for design or acceptance decisions. For tailored solutions and tools, contact MechaPoint.