7/9/2014 Maryland Metrics: Metric Conversion Chart (converts nominal metric to nominal national pipe thread)

http://www.mdmetric.com/tech/metnptcomp.htm 1/1

NOMINAL NPT PIPE SIZE toNOMINAL METRIC SIZE

CONVERSION CHART

NOMINAL PIPE SIZE(INCHES/U.S.)

NOMINAL PIPE SIZE(METRIC)

1/8" 6 mm

3/16" 7 mm

1/4" 8 mm

3/8" 10 mm

1/2" 15 mm

5/8" 18 mm

3/4" 20 mm

1" 25 mm

1-1/4" 32 mm

1-1/2" 40 mm

2" 50 mm

2-1/2" 65 mm

3" 80 mm

3-1/2" 90 mm

4" 100 mm

4-1/2" 115 mm

5" 125 mm

6" 150 mm

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