HomeResourcesBlogSurface Roughness (Ra) Requirements for Tensile and Fatigue SpecimensGet quoteTwo round bars come off the same lathe, cut from the same heat of steel, to the same drawing dimensions. One runs to a fatigue life that lands neatly in the expected band. The other fails early, and the fracture starts at a shallow tool mark … Continue reading Surface Roughness (Ra) Requirements for Tensile and Fatigue Specimens