Counterbore, countersink & clearance
A socket head cap screw seats in a counterbore just over its head diameter — an M6 SHCS has a Ø10 head, so it takes an Ø11 counterbore deep enough to sink the head below flush, over a clearance hole picked from the fine/medium/coarse (metric) or close/normal (inch) series. Type or pick the screw below; on the Joint tab, choose a socket head in a counterbore, a flat head in its countersink, or a hex head on the face, and the hole series: the seat is drawn with its screw seated and its dimensions listed, metric and inch.
Drawings often specify these implicitly — “C’BORE FOR M6 SHCS” — and the inspector needs the numbers the note implies. That implied dimension is exactly what the Joint tab gives you, for the size you pick.
Close, normal, or loose clearance — which do I use?
The clearance series trades assembly forgiveness against location control. Close fits suit doweled or precisely located joints where the screw shouldn’t float; normal is the default for general work; loose absorbs stack-up across patterns of many fasteners or painted/coated parts. If the drawing just says “drill thru for M6”, normal clearance is the customary reading — but confirm against the note or your customer’s drawing-interpretation flow-down when position tolerances are tight.