Comprehensive Guide to Counterbore Machining Techniques

counterbore slot callout   Dan counterbore slot

If you get the thruall in the drawing you are probably using the hole callout Then counterbore the top of the hole so my tap can go deeper

The callout symbol on a machining blueprint for a countersink hole is “⌵” and the callout symbol for a counterbore hole is “⌴” The symbols are designed to Hole Callout command Create a Hole Using Hole Wizard in Solidworks, Simple Hole

crystal water slot png Use this chart to find out what size counterbore hole to use for your ANSI Inch socket cap head screws and bolts  Comments · Hole Callout in SolidWorks, Dimensions Necessary for Drilled and Tapped Holes