O One of the factors at the center of cost expenditures is the purchase of raw materials. In creating a product or service, a stable flow of raw materials is very important. In obtaining raw materials / materials, PT Alat Berat not only requires local suppliers but also imports. The highest imported material is found in the Bulldozer unit, so localization activities are carried out on the trunnion component. The trunnion is part of the dozzer unit which is attached to the end of the pivot shaft which functions to secure and strengthen the Track Frame when moving the C-frame. The production process of original trunnion is machining process. To reduce scrap materials / materials, the production process of trunnion was replaced by a forging process (by local suppliers). Characterization of the original specimen such as hardness value of 247 HB, yield strength of 629.70 Mpa, maximum tensile strength of 819.27 Mpa and % elongation 18.49. The problem that occurs is the mismatch of mechanical properties, the value of % elongation which is very low compared to the original specimen, 7.87. So that, the addition of variations in the heat treatment process using normalizing and quenching + tempering methods to obtain the desired properties and microstructure. Replacement specimens using the Quenching + Tempering heat treatment method have characterizations that are close to the original specimen with a hardness value of 276 HB, yield strength of 617.29 Mpa, maximum tensile strength of 813.74 Mpa and % elongation of 18.84, so the trunnion component can be localized.