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Pipe Thread Sizes

Pipe Thread sizes are given in there own measurement units nominal pipe thread(NPT). Example 3/8" NPT=.675 inches. Most people make the mistake of assuming 3/8" NPT would equal .375 inches (this is incorrect). To determine pipe thread size for a FNPT measure the inside diameter and for MNPT measure the outside diameter. Take the measurement and find the closest size given in column 1 or column 2, column 3 will be your NPT size.

Column 1 Column 2 Column 3
Inches Inches(Decimal) Pipe Thread Size
5/16 0.3125 1/16
13/32 .405 1/8
35/64 0.540 1/4
43/64 0.675 3/8
27/32 0.840 1/2
1-3/64 1.050 3/4
1-5/16 1.315 1
1-21/32 1.660 1-1/4
1-29/32 1.900 1-1/2
2-3/8 2.375 2
2-7/8 2.875 2-1/2

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