https://mechcalc.net/blog/en/tags/preliminary-design/ Recent content in Preliminary Design on MechCalc how-to Guide https://mechcalc.net/blog/og-default.png https://mechcalc.net/blog/og-default.png Hugo en Mon, 13 Apr 2026 18:20:00 +0200 https://mechcalc.net/blog/en/posts/bolt-preselection-03-quick-table/ Mon, 13 Apr 2026 18:20:00 +0200 https://mechcalc.net/blog/en/posts/bolt-preselection-03-quick-table/ No calculation needed — one table for a preliminary estimate of bolt size! This article gives the minimal table-lookup method for bolt pre-selection: knowing only the maximum working load a single bolt carries — axial static load, axial dynamic load or transverse shear force — you can read the recommended nominal diameter (M4 and up) and the minimum property-class combination straight from the load-range table, a result in seconds, good for quick estimates on the shop floor and in technical discussion; for a precise calculation switch to the Kübler equation or the full VDI 2230 method. https://mechcalc.net/blog/en/posts/bolt-preselection-01-load-to-size/ Thu, 26 Mar 2026 20:58:00 +0100 https://mechcalc.net/blog/en/posts/bolt-preselection-01-load-to-size/ For a given working load, how large should the bolt be? This article covers the preliminary design and pre-selection of bolts: first read the nominal diameter and property class from a quick pre-selection table by load range, then use the Kübler equation to back out the thread stress cross-section from the axial working load and the required clamping force, combined with the tightening factor, reduction factor and simplified fatigue and bearing-pressure checks, to help engineers quickly size a bolt in the early design stage.