Uniwest Enterprises Wood Screw Sizing Chart
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WOOD SCREW SIZING CHART
WOOD SCREW SIZE
FOR HARD WOODS
FOR SOFT WOODS
COUNTERSINK
SHANK DIAMETER*
THREADS
TAPERED
STRAIGHT
TAPERED
STRAIGHT
SIZE
NO.
PER INCH
BIT
BIT
BIT
BIT
DECIMAL
FRACTIONAL
2
26
0.086
3/32
3/32
1/16
5/64
1/16
1/4
3
24
0.099
7/64
7/64
5/64
3/32
1/16
1/4
4
22
0.112
7/64
7/64
5/64
3/32
1/16
1/4
5
20
0.125
1/8
1/8
3/32
7/64
5/64
5/16
6
18
0.1375
9/64
9/64
7/64
1/8
3/32
5/16
7
16
0.151
5/32
5/32
7/64
9/64
3/32
5/16
8
15
0.164
5/32
11/64
1/8
5/32
7/64
3/8
9
14
0.177
11/64
3/16
9/64
11/64
1/8
3/8
10
13
0.19
3/16
13/64
9/64
3/16
1/8
7/16
12
11
0.216
7/32
7/32
5/32
13/64
9/64
7/16
14
10
0.242
1/4
1/4
11/64
15/64
5/32
1/2
16
9
0.268
17/64
9/32
3/16
17/64
11/64
9/16
18
8
0.294
19/64
5/16
7/32
19/64
13/64
5/8
20
8
0.320
5/16
21/64
15/64
5/16
7/32
3/4
24
7
0.372
3/8
3/8
17/64
3/8
1/4
3/4
*Shank diameter is measured on the smooth portion of the screw above the threads.
SOME COMMON SENSE TIPS WHEN WORKING WITH WOOD SCREWS
Use soap or wax to lubricate screws in hardwoods.
To keep brass screw heads from twisting off, use the same size steel screw to thread the wood, then insert the brass screw.
Your screwdriver bit is less likely to slip when you use Phillips or Robertson (Square Head) style screws.
Use a drill with an adjustable chuck clutch to avoid stripping screw heads.
Drilling pilot holes prevents your wood from splitting and allows for a tighter joint.
Chart Courtesy Of UNIWEST ENTERPRISES, INC.
Corporate Offices
Mailing Address
2136 12th Street · Building A
Post Office Box 147
Gilberts, Illinois 60136-0147
Rockford, Illinois 61104
Telephone: (815) 963-3331 · Telefax: (815) 963-3332
Website: · E-mail:
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