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.
 curtesy of Physics College of Sciences
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