Counterbore Hole Size for Socket Head

Do not worry about it, I always use a slot drill for counterbores, the standard counterbores always use a larger guide pin than I use for the thread clearance

Counterbored Holes Dimensions USA SOCKET-HEAD CAP SCREWS Screw dia Counterbore dia Counterbore depth Countersink dia Clearance dia

counterbore slot Start with an extruded slot of the desired shape Then add a chamfer to the edge of the slot

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