This custom precision spur gear with a keyway is manufactured from 42CrMo alloy steel, a material offering excellent strength, toughness, and fatigue resistance. Capable of withstanding high torque and alternating loads, it is ideal for medium-to-high-speed, heavy-duty transmission applications, effectively resisting tooth surface wear and the risk of tooth breakage. The gear undergoes a black oxide surface treatment, creating a uniform protective layer that enhances rust resistance while reducing friction losses on the tooth surfaces. We offer comprehensive OEM customization services, allowing for adjustments to the module, number of teeth, face width, bore diameter, keyway specifications, and set screw locations based on customer drawings. These gears are widely used in power transmission systems such as gear reducers, conveyor equipment, and industrial transmission modules. As a reliable, OEM-quality component, the gear profile, bore, and keyway dimensions are strictly controlled to ensure precise assembly with the drive shaft, stable transmission, and reliable torque output. With its robust mechanical properties, this 42CrMo spur gear is a preferred choice for heavy-duty transmission applications.