Lumax LX-3007 Gold/Silver ¼”-28 Taper Thread (SAE-LT) Straight 0. 54” Long Grease Fitting, (Pack of 100). Fully hardened for extra durability and to protect them from wear due to constant use. Ball check in the head prevents dirt and grit from getting into the fitting. Heavier wall thickness for extra strength. Stress Relieved and Tempered Carbon Steel Spring. Every fitting is individually inspected and batch tested to 5, 000 PSI. Designed to meet the demanding requirements of most Automotive, Agricultural, Industrial, Marine, Truck, Federal, and, Construction Equipment needs. Thread rolled taper threads are stronger and durable due to hardening and toughening of threads. This is not achievable in a cut thread process, as the threads become brittle on the periphery. Dome type riveting completely covers the spring enabling the spring to be firmly secured in its place. Lumax products are built to the highest standards and incorporate many unique features that make work easier, faster and cost-effective. We have a passion for the design process. We listen to our customers and their ever-expanding requirements. Our unique products lead the field in design, quality, and performance.