This straight grease fitting, also known as a grease nipple, provides a threaded access point for introducing lubricant into a bearing or pivot joint. It is installed directly into a tapped hole on the component that requires lubrication, such as a universal joint, linkage pin, or bushing. The 180-degree straight configuration allows a grease gun coupler to attach axially with the fitting. A worn or clogged fitting prevents grease from reaching the joint, leading to accelerated wear and eventual seizure of the moving parts. The manufacturer machines the thread to match the original housing's tolerance, ensuring a secure seal without cross-threading during installation.