Q: Do the dimensions of the 1/2" NPT thread correspond to outer or inner diameters?

The 1/2" NPT thread (National Pipe Thread) indicated in the specifications of the Allura SLW76221.2 faucet is a standard tapered thread specification for hydraulic fittings. To clarify the dimensions: Outer diameter (OD) : approximately 0.840" (21.3 mm) - this is the diameter of the male thread itself Inner bore : approximately 0.493" (12.5 mm) - this is the water passage inside the pipe In practice, when the manual mentions 1/2" NPT , it refers to the standard nominal NPT size , and it is the outer thread that fits into a female fitting. The 1/2" is designated by this NPT standard, even though the actual diameter of the thread is larger (0.840"). If you need to check the compatibility of your fittings during installation, make sure they are certified 1/2" NPT - this is the standard that matters for Allura SLW76221.2.

Question 1

Do the dimensions of the 1/2" NPT thread correspond to outer or inner diameters?

Accepted Answer

The 1/2" NPT thread (National Pipe Thread) indicated in the specifications of the Allura SLW76221.2 faucet is a standard tapered thread specification for hydraulic fittings.

To clarify the dimensions:

Outer diameter (OD): approximately 0.840" (21.3 mm) - this is the diameter of the male thread itself
Inner bore: approximately 0.493" (12.5 mm) - this is the water passage inside the pipe

In practice, when the manual mentions 1/2" NPT, it refers to the standard nominal NPT size, and it is the outer thread that fits into a female fitting. The 1/2" is designated by this NPT standard, even though the actual diameter of the thread is larger (0.840").

If you need to check the compatibility of your fittings during installation, make sure they are certified 1/2" NPT - this is the standard that matters for Allura SLW76221.2.

Question 2

What is the thread diameter of the water hose connector for the Symmons Allura SLW76221.2 faucet?

Accepted Answer

The water hose connector (inlet connector) of the Symmons Allura SLW76221.2 faucet uses a 1/2" NPT (half-inch National Pipe Thread). This specification applies to both the hot and cold water inlets of the faucet.

The 1/2" NPT is the industry standard for kitchen and bathroom faucets. Supply pipes compatible with this thread diameter are readily available in the market.

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