British Tools & Fasteners, LLC
7696 Route 31
Lyons, NY 14489
USA
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P: 315 946 9400 F: 315 946 4456

WOOD SCREWS

Marking out for woodscrews.

Drill size tables for woodscrews.

Drilling for standard thread woodscrews.

Drilling for "Twinfast" woodscrews.

Woodscrews are gauged by screw gauge - listed below - where the bigger the number, the bigger the screw

Wood Screw Data 

Nominal Diameter

Clearance

Pilot Hole

Gauge

Decimal inch

mm

Hole

Hardwood

Softwood

Metal

2

.082

2.08

3/32”

1/16”

-

-

3

.094

2.39

3/32”

1/16”

-

-

4

.108

2.74

7/64”

1/16”

-

5/64”

5

.122

3.10

1/8”

5/64”

-

-

6

.136

3.45

9/64”

3/32”

1/16”

3/32”

7

.150

3.81

5/32”

3/32”

1/16”

-

8

.164

4.17

11/64”

3/32”

5/64”

7/64”or 1/8”

9

.178

4.52

3/16”

7/64”

5/64”

-

10

.192

4.88

13/64”

7/64”

5/64”

9/64”or5/32”

12

.220

5.59

15/64”

1/8”

3/32”

11/64”or3/16”

14

.248

6.30

1/4”

9/64”

7/64”

13/64”or7/32”

16

.276

7.01

9/32”

5/32”

1/8”

-

18

.304

7.72

5/16”

11/64”

1/8”

-

20

.332

8.43

11/32”

3/16”

9/64”

-

 

 

 

 Shank Diameter Root Diameter
Screw Number Max. Head Diameter Basic Decimal Size Nearest Fractional Equivelant Average Decimal Size Nearest Fractional Equivelant Threads Per Inch
0 .119 .060 1/16 .040 3/64 32.00
1
 .146 .073 5/64 .046 3/64 28.00
2 .172 .086 3/32 .054 1/16 26.00
3 .199 .099 7/64 .065 1/16 24.00
4 .225 .112 7/64 .075 5/64 22.00
5 .252 .125 1/8 .085 5/64 20.00
6 .279 .138 9/64 .094 3/32 18.00
7 .305 .151 5/32 .102 7/64 16.00
8 .332 .164 5/32 .112 7/64 15.00
9 .358 .177 11/64 .122 1/8 14.00
10 .385 .190 3/16 .130 1/8 13.00
11 .411 .203 13/64 .139 9/64 12.00
12 .438 .216 7/32 .148 9/64 11.00
14 .491 .242 1/4 .165 5/32 10.00
16 .544 .268 17/64 .184 3/16 9.00
18 .597 .294 19/64 .204 13/64 8.00
20 .650 .320 5/16 .233 7/32 8.00
24 .756 .372 3/8 .260 1/4 7.00
This category contains 1 subcategory
STAINLESS WOOD SCREWS
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