Two metamodels are presented to describe 107 cycles axial fatigue strength of four ferrous powder metal material series: sintered and heat-treated iron-carbon steel, iron-copper and copper steel, iron-nickel and nickel steel and prealloyed steel. The materials are defined at ranges of carbon content and densities using the broad data available in MPIF Standard 35 for powder metal structural parts. The first metamodel evaluates 107 cycles axial fatigue strength as a function of density and ultimate strength and the second metamodel as a function of density and hardness. For all studied materials, both metamodels are found to have a good correlation between the distributions of the calculated and measured 107 cycles axial fatigue strength with a Pearson’s correlation coefficient of 0.97. The paper describes the metamodel development including their form and how to select the combinations of density - ultimate strength and density - hardness as best predictors for 107 cycles axial fatigue strength. The presented metamodels intend to support structural and cyclic-fatigue numerical methods in product design and manufacturing.