Clearance Holes Charts for Bolts

These tables are used to determine the clearance holes for bolts and screws.  They specify a common practice for preperation for drilling, under-cutting, counter bores and counter sinks.  

Bolt Dia - standard bolt size

A - clearance hole size

B - flat spot size

C - couner-bore size

D - minimum depth of counter-bore 

E - Couner-sink diameter

To enlarge the table just click on the image.  It will open in a separate window.

Clearance holes (imperial) Page 1

Clearance Holes (imperial) Page2

Clearance Holes (metric) Page 1

Clearance Holes (metirc) Page 2

Tap Drill Reference tables[1]

References:

[1] curtesy of Physics College of Sciences

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