Screw Size

Inch

Decimal

Nearest

Fraction

Metric

Equivalent

#0

0.060 in.

1/16"

1.52 mm

#1

0.073 in.

5/64"

1.85 mm

#2

0.086 in.

3/32"

2.18 mm

#3

0.099 in.

7/64"

2.51 mm

#4

0.112 in.

7/64"

2.84 mm

#5

0.125 in.

1/8"

3.18 mm

#6

0.138 in.

9/64"

3.51 mm

#8

0.164 in.

5/32"

4.17 mm

#10

0.190 in.

3/16"

4.83 mm

#12

0.216 in.

7/32"

5.49 mm

#14

0.250 in.

1/4"

6.35 mm

US Machine Screw Diameters. Helpful chart for sizing a measured screw using calipers into the standard US / Inch machine screw size.

For more help measuring screw diameter, please see our Measuring Fastener Diameter page.