For 3/16" Dia. Hole, Straight, 0. 50". Case Hardened Head only 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. Drive Fittings avoid Tapping Costs in Variety of Applications. Circumferential Serrated Shank provides a Grease Tight Seal when Installed. They also simplify the Replacement of Damaged Fittings in Old or Oversized Holes. Recommended only for Low to Medium Pressure Applications. Drive Fittings must be used where High Lubricant Back Pressures can be Developed. Holes Sizes and Shank Dimensions Must Be Used as Reference Only. To determine Optimum Hole Size, Test Applications should be conducted using the Type of Material into which the Fitting is to be Installed ex. Aluminum, Brass, Bronze, Cast Iron, Copper, Steel etc. Production Tolerances of Hole Size must be taken into Consideration when Test is Conducted. Use LX-1430 Drive Fitting Tool to Install these Fittings. 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.