|
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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