Structural, mechanical and machine-element reference — the numbers that come up constantly on the bench or in the field. Pick one below.
Deflection, bending stress, and safety factor for five standard support & load cases — load, shear, moment, and deflection drawn live.
Darcy–Weisbach head loss with a live Moody diagram — flow rate, pipe size, material, and fluid in, pressure drop out.
Pick a bolt size, grade, and lubrication condition — get the installation torque, with a realistic ±25% uncertainty band.
Length, mass, pressure, energy, power, temperature and more — twelve categories with exact standard factors and a live reference table.
Viscosity, density and specific gravity for oils, fuels and common fluids — with live viscosity-versus-temperature curves you can compare side by side.
Otto, Diesel, Brayton and Carnot ideal cycles — real state-by-state thermodynamics, with net work as the area enclosed.
Overall ratio, output speed, torque and rotation direction for up to three meshed gear stages, with mesh efficiency.
Helical compression spring stiffness, deflection and coil shear stress, with the Wahl correction and a safe-load limit.
Euler's formula for slender columns with automatic Johnson-formula fallback for short ones — critical load for any end condition.
Pressure times area is force. Solve F = P·A, see the cylinder to scale, and watch a small piston multiply into a big load through Pascal's principle.
ISO 286 hole and shaft tolerances for any nominal size, the clearance or interference between them, and a to-scale tolerance-zone diagram.
ISO 281 L10 bearing life — dynamic load rating, equivalent load and speed, with a quick-reference table of standard bearing sizes.
AS568 groove and gland design — squeeze, stretch and gland fill for static or dynamic seals, against standard cross-sections.
DIN 471/472 retaining ring groove dimensions and thrust load capacity, for external (shaft) or internal (bore) rings.