Red Deer Fastners Wood Screw Size Chart
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1CHARTS
THREAD
WOOD SCREW
COURSE
FINE
DIAMETER
UNC TPI
UNC TPI
WOOD SCREW SIZE CHART
Maximum
OF BOLT
THREAD
THREAD
THE FASTENER GROUP
Root Diameter
Head
Screw
¼
20
28
Diameter
# &
Shank Diameter
TPI
5/16
18
24
Fractional
Decimal
Fractional
Decimal
3/8
16
24
0 32
1/16
.060
3/64
.119
.119
7/16
14
20
1 28
5/64
.073
3/64
.146
.146
½
13
20
2 26
3/32
.086
1/16
.172
.172
9/16
12
18
3 24
7/64
.099
1/16
.199
.199
5/8
11
18
4 22
7/64
.112
5/64
.225
.225
¾
10
16
5 20
1/8
.125
5/64
.252
.252
7/8
9
14
6 18
9/64
.138
3/32
.279
.279
1
8
14
7 16
5/32
.151
7/64
.305
.305
1-1/8
7
12
8 15
5/32
.164
7/64
.332
.332
1-1/4
7
12
9 14
11/64
.177
1/8
.358
.358
1-1/2
6
12
10 13
3/16
.1290
1/8
.385
.385
No 2
56
14
11 12
13/64
.203
9/64
.411
.411
No 3
48
14
12 11
7/32
.216
9/64
.438
.438
No 4
40
12
14 10
¼
.242
5/32
.491
.491
No 5
40
12
16 9
17/64
.268
3/16
.544
.544
No 6
32
12
18 8
19/64
.294
13/64
.597
.597
No 8
32
-
20 8
5/16
.320
7/32
.650
.650
No 10
24
32
No 12
24
-
IMPERIALTO METRIC CONVERSIONS – APPROXIMATE NUMBERS ONLY
Metric
Imperial
Metric
Imperial
Metric
Imperial
2mm
3/32
35mm
1-3/8
100mm
3-15/16
2.5mm
3/32
40mm
1-9/16
110mm
4-5/16
3mm
1/8
45mm
1-3/4
120mm
4-3/4
4mm
5/32
50mm
2
130mm
5-1/8
5mm
3/16
55mm
2-3/16
140mm
5-1/2
6mm
¼
60mm
2-3/8
150mm
5-7/8
8mm
5/16
65mm
2-9/16
160mm
6-616
10mm
13/32
70mm
2-3/4
170mm
6-11/16
12mm
15/32
75mm
2-15/16
180mm
7-1/16
16mm
5/8
808mm
3-1/8
190mm
7-1/2
20mm
25/32
85mm
3-3/8
200mm
7-7/8
25mm
1
90mm
3-9/16
30mm
1-3/16
95mm
3-3/4
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