Tools
Calculators that turn the database into an answer. Each one shows its working, because a number you cannot check is a number you cannot use on a drawing.
Available now
5 toolsToolMaterial weight calculatorMass of a round bar, square bar, hexagon bar, flat bar or tube from its dimensions and the density of the material. Covers metals, plastics and wood on one scale, and shows the arithmetic behind the answer.Section dimensions + materialToolThread & screw identifierHave a fastener in hand and a caliper but no part number? Enter the outside diameter and the pitch and it returns the likely designation, with the deviation from nominal so you can judge the match.Measured diameter and pitchToolCross-standard comparisonTwo standards catalogued as equivalents, compared field by field — head height, across flats, thread tolerance. Built for the question "can I actually substitute this?"Two standard designationsToolProperty class referenceTensile strength, yield strength and the matching nut class for every property class from 4.8 to 12.9, plus the A2 and A4 stainless families.Bolt class or materialToolTightening torque calculatorTorque from thread geometry and property class, with friction as a control you set rather than a constant baked in. Shows the preload it implies, and how far the figure moves between dry, oiled and plated conditions.Thread + property class + lubrication
How these fit together
data first, then tools, then everything built on top2 · ToolsCalculators and comparisons that operate on that datathis page
The order matters: a calculator is only as good as the data under it, which is why the dataset gets built out before more tools are added.
Planned
not built yetPlannedTolerance & fits calculatorShaft and hole limits for a stated fit, with clearance and interference across the tolerance band.