Harvey Tool 987176 | 7/16-20 Thread 0.3500" Cutting Diameter 4FL Uncoated Carbide Helical Flute Thread MillFeatures Designed for deep threaded applications Larger cutter diameter for maximum strength Due to increased cutting diameter, tools are designed to achieve 60% threads Cuts internal 60 Degree UN threads only Mills right hand and left hand threads Able to cut larger threads of the same pitch Helical flutes Solid carbide CNC ground in the USA Product Specifications Size 7 16 20 Milling Diameter (Decimal Inch) 0. 3500" Shank Diameter (Decimal Inch) 0.