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M3-M12 HSS Counterbore Set

Fastener Size	Pilot Hole Diameter (Close Fit H12)	Pilot Hole Diameter (Normal Fit H13)	Pilot Hole Diameter (Loose Fit H14)	Counterbore Diameter	Counterbore Depth
M3	3.2	3.4	3.6	6.5	3.5
M4	4.3	4.5	4.8	8.0	4.5
M5	5.3	5.5	5.8	10.0	5.8
M6	6.4	6.6	7.0	11.0	6.8
M8	8.4	9.0	10.0	15.0	8.8
M10	10.5	11.0	12.0	18.0	10.8
M12	13.0	13.5	14.5	20.0	12.8