Lumax LX-4801 Gold/Silver (SAE) 1/4"-28 Taper Thread 8 Piece Grease Fitting Assortment. Every Fitting is individually inspected, and batch tested to 5, 000 PSI. 1/4"-28 Taper Thread (SAE-LT), Straight (LX-3007, Qty: 4), 1/4"-28 Taper Thread (SAE-LT), 45 degree (LX-3013, Qty: 2), 1/4"-28 Taper Thread (SAE-LT), 90 degree (LX-3019, Qty: 2). Thread rolled taper threads are stronger and durable due to hardening and toughening of threads. This 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 is a manufacturer of lubrication and fluid management products. Our products, including grease guns, manual and electric pumps, funnels, drains, grease fittings, filter wrenches, and accessories, are built to the highest standards and incorporate many proprietary features. Lumax's mission is to provide professionals and consumers with innovative and high-quality products to get the job done right. Product development at Lumax goes beyond the physical product, to a deeper understanding of the end-users' needs. Engineered with the "user-in-mind, " 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.