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Machine components such as gear and crankshaft require hard surface and ductile core characteristics. One method to obtained such characteristics is pack carburizing. This research concern to compare the mechanical properties of carburized low carbon steel under different carburizers; GBC (80% goat bone charcoal + 20% BaCO3) and BC (80% bamboo charcoal + 20% BaCO3). The specimens placed in a steel box containing carburizer, loaded into an electric furnace, heated up to a temperature of 950 OC, soaked for 4 hours and quenched in the oil. The hardness and strength of samples were measured by applying of Vickers Hardness Tester and Universal Tensile Machine, respectively. The results of the research showed that hardness, yield strength, tensile strength and modulus elasticity of both carburized low carbon steel increased significantly, however, there was a decrease in elongation. The closer to the core the lower of hardness obtained until at a distance is equal to raw material hardness. The use of carburizer GBC produces carburized steel with higher yield strength (51.75 kg.mm-2), tensile strength (74.58 kg.mm-2), and elongation (5.78 %) than carburizer BC but lower in hardness (558.13 HV1), modulus elasticity (256.79 GPa), and effective case depth (0.33 mm). The mechanical properties of carburized low carbon steels have fulfilled requirements as the material of gear or shaft.