Free-to-use tools
NBR 6158 Fit Engine
High-precision metrological calculator for hole-basis and shaft-basis systems, in strict compliance with the ABNT NBR 6158 standard (equivalent to ISO 286). It processes nominal dimensions from $1\text{ mm}$ to $3150\text{ mm}$, instantly providing limit deviations, fundamental deviations, tolerances ($IT$), maximum/minimum interference or clearance values, and a graphical representation of the mechanical fit.
Interactive ISO 6336 Gear Solver
An instant, zero-overhead web utility for preliminary verification of cylindrical spur and helical gears. By inputting basic macrogeometry ($m_n$, $z_1$, $z_2$, $\beta$, $x_1$), application factor ($K_A$), and nominal torque ($T$), the solver immediately computes fundamental pitch diameters ($d$), center distance ($a$), and renders the precise involute tooth profile.
It delivers a Tier-1 simplified evaluation of safety factors for contact fatigue / pitting ($S_H$) and tooth bending strength ($S_F$) in strict accordance with the ISO 6336 rating standard.