The default length unit for Ansa imported step model is mm, and the weight is ton. However, the SI unit we commonly use is m for length and kg for weight. The conversion between the two units is shown in the following table.

LENGTH MASS TIME FORCE STRESS ENERGY DENSITY YOUNG’s MUDULUS Velocity (56.3KPH) GRAVITY
m kg s N Pa Joule 7.83E+03 2.07E+11 15.64 9.81
mm ton s N MPa N-mm 7.83E-09 2.07E+05 1.564E+04 9.81E+03

When defining model parameters, care should be taken to select the corresponding unit system based on the length.