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Countersink Drill Size Chart


Countersink Drill Size Chart


This chart below is designed to help you get the proper set-up for using a countersink and match it with either a Taper Point bit or a Straight bit. First you must select the Screw Size that you are working with down the Left side of the chart. Then find the corresponding column as you decide upon a Tapered or Straight Drill bit and whether the wood is a hardwood or a softwood.

 

Screw Size

Appropriate C-Sink Cut
Taper Drill
Straight Drill
Bung Diameter
Hardwood Softwood Hardwood Softwood
#2 1/4" 3/32" 5/64" 1/16" 1/16" 1/4"
#3 1/4" 7/64" 3/32" 5/64" 1/16" 1/4"
#4
1/4" 7/64" 3/32" 5/64" 1/16" 1/4"
#5 5/26" 1/8" 7/64" 3/32" 5/64" 5/16"
#6 5/16" 9/64" 1/8" 7/64" 3/32" 5/16"
#7 3/8" 5/32" 9/64" 7/64" 3/32" 5/16"
#8 3/8" 11/64" 5/32" 1/8" 7/64" 3/8"
#9 3/8" 3/16" 11/64" 9/64" 1/8" 3/8"
#10 7/16" 13/64" 3/16" 9/64" 1/8" 7/16"
#12 1/2" 7/32" 13/64" 5/32" 9/64" 1/2"
#14 1/2" 1/4" 15/64" 11/64" 5/32"

1/2"

#16 5/8" 9/32" 17/64" 3/16" 11/64" 5/8"
#18 5/8" 5/16" 19/64" 7/32" 13/64" 5/8"
#20 3/4" 21/64" 5/16" 15/64" 7/32" 3/4"
#24 7/8" 3/8" 3/8" 17/64" 1/4" 7/8"


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