US to Metric Conversion Table

US-Metric Conversion Table for Fasteners

Length Conversion

US Units (Inches) Metric Equivalent (Millimeters)
1/64 inch 0.3969 millimeters (mm)
1/32 inch 0.7938 millimeters (mm)
1/16 inch 1.5875 millimeters (mm)
3/32 inch 2.38125 millimeters (mm)
1/8 inch 3.175 millimeters (mm)
5/32 inch 3.96875 millimeters (mm)
3/16 inch 4.7625 millimeters (mm)
7/32 inch 5.55625 millimeters (mm)
1/4 inch 6.35 millimeters (mm)
5/16 inch 7.9375 millimeters (mm)
3/8 inch 9.525 millimeters (mm)
7/16 inch 11.1125 millimeters (mm)
1/2 inch 12.7 millimeters (mm)
9/16 inch 14.2875 millimeters (mm)
5/8 inch 15.875 millimeters (mm)
11/16 inch 17.4625 millimeters (mm)
3/4 inch 19.05 millimeters (mm)
13/16 inch 20.6375 millimeters (mm)
7/8 inch 22.225 millimeters (mm)
15/16 inch 23.8125 millimeters (mm)
1 inch 25.4 millimeters (mm)
1 1/8 inch 28.575 millimeters (mm)
1 1/4 inch 31.75 millimeters (mm)
1 3/8 inch 34.925 millimeters (mm)
1 1/2 inch 38.1 millimeters (mm)
1 5/8 inch 41.275 millimeters (mm)
1 3/4 inch 44.45 millimeters (mm)
1 7/8 inch 47.625 millimeters (mm)
2 inches 50.8 millimeters (mm)
3 inches 76.2 millimeters (mm)
4 inches 101.6 millimeters (mm)
6 inches 152.4 millimeters (mm)
8 inches 203.2 millimeters (mm)
10 inches 254 millimeters (mm)
12 inches 304.8 millimeters (mm)
18 inches 457.2 millimeters (mm)
24 inches 609.6 millimeters (mm)
36 inches 914.4 millimeters (mm)
48 inches 1219.2 millimeters (mm)
60 inches 1524 millimeters (mm)
72 inches 1828.8 millimeters (mm)

Diameter (Gauge to Metric)

US Units (Gauge) Metric Equivalent (Millimeters)
#0000 0.46 mm
#000 0.51 mm
#00 0.61 mm
#0 1.524 mm
#1 1.727 mm
#2 1.981 mm
#3 2.261 mm
#4 2.413 mm
#5 2.565 mm
#6 2.794 mm
#7 3.048 mm
#8 3.251 mm
#9 3.454 mm
#10 3.658 mm
#12 4.191 mm
#14 4.775 mm
#16 5.291 mm
#18 5.873 mm
#20 6.553 mm
#24 8.229 mm

Diameter (Fractional Inches to Metric)

US Units (Inches) Metric Equivalent (Millimeters)
1/64 inch 0.3969 mm
1/32 inch 0.7938 mm
3/64 inch 1.1906 mm
1/16 inch 1.5875 mm
5/64 inch 1.9844 mm
3/32 inch 2.38125 mm
7/64 inch 2.7781 mm
1/8 inch 3.175 mm
9/64 inch 3.5719 mm
5/32 inch 3.96875 mm
11/64 inch 4.3656 mm
3/16 inch 4.7625 mm
13/64 inch 5.1594 mm
7/32 inch 5.55625 mm
15/64 inch 5.9531 mm
1/4 inch 6.35 mm
9/32 inch 7.14375 mm
5/16 inch 7.9375 mm
11/32 inch 8.73125 mm
3/8 inch 9.525 mm
13/32 inch 10.31875 mm
7/16 inch 11.1125 mm
15/32 inch 11.90625 mm
1/2 inch 12.7 mm
9/16 inch 14.2875 mm
5/8 inch 15.875 mm
11/16 inch 17.4625 mm
3/4 inch 19.05 mm
13/16 inch 20.6375 mm
7/8 inch 22.225 mm
15/16 inch 23.8125 mm
1 inch 25.4 mm
1 1/8 inch 28.575 mm
1 1/4 inch 31.75 mm
1 3/8 inch 34.925 mm
1 1/2 inch 38.1 mm
1 5/8 inch 41.275 mm
1 3/4 inch 44.45 mm
1 7/8 inch 47.625 mm
2 inches 50.8 mm
2 1/4 inches 57.15 mm
2 1/2 inches 63.5 mm
2 3/4 inches 69.85 mm
3 inches 76.2 mm
3 1/4 inches 82.55 mm
3 1/2 inches 88.9 mm
3 3/4 inches 95.25 mm
4 inches 101.6 mm

Thread Pitch

US Units (Threads Per Inch - TPI) Metric Equivalent (Threads Per Millimeter - TPM)
80 TPI 3.175 TPM
72 TPI 2.822 TPM
64 TPI 2.54 TPM
56 TPI 2.204 TPM
48 TPI 1.905 TPM
40 TPI 1.5875 TPM
36 TPI 1.411 TPM
32 TPI 1.27 TPM
28 TPI 1.058 TPM
24 TPI 0.794 TPM
20 TPI 0.635 TPM
18 TPI 0.563 TPM
16 TPI 0.5 TPM
14 TPI 0.453 TPM
13 TPI 0.393 TPM
12 TPI 0.333 TPM
11 TPI 0.287 TPM
10 TPI 0.254 TPM
9 TPI 0.222 TPM
8 TPI 0.198 TPM
7 TPI 0.178 TPM
6 TPI 0.158 TPM
5 TPI 0.127 TPM
4 TPI 0.1016 TPM