ExtractionTools for Helical Inserts. Place the tip of these tools into an insert and strike a light blow to the toolβs head. Then turn the tools counterclockwise with pressure to extract the insert. For Thread Size. Each. 7/16 "-14, 7/16 "-20, 1/2 "-13, 1/2 "-20, 1/2 "-28, 9/16 "-12, 9/16 "-18, 5/8 "-11, 5/8 "-18, 5/8 "-24, 3/4 "-10, 3/4
Thefirst step in drilling a hole for a 5/16 tap is to choose the right size drill bit. The size of the drill bit should be slightly smaller than the size of the tap, which in this case would be 5/16 inches. A drill bit size of 13/64 inches is the most commonly used size for a 5/16 tap. TapDrill Sizes for 15/16 - 20 UNEF. If not specified, assume a thread depth of 75%. You can learn more about thread depth in tapping here. To get the tap drill size in other depths, use our Tap Drill Size Calculator . Thread Depth Tap Drill Size (Inch) (UNC/UNF/UNEF) National Pipe (NPT) Dryseal Pipe (BPTF) British Pipe (BSP) ACME fcWekew.