1/2 NPT thread dimensions

ASME B1.20.1 · Taper 1:16 · 60°

Dimensions

Standard: ASME B1.20.1
Form: Taper 1:16
Major diameter: 21.336 mm
Threads per inch: 14
Pitch: 1.814 mm
Flank angle: 60°
Seals on: Thread + sealant
Used for: Process connections and cable entries

For taper threads the diameter is the nominal pipe outside diameter used for identification; the thread diameter changes along the length at a taper of 1:16.

Check a measurement against this thread

Easily confused with

Thread	Standard	Major diameter	Flank	Seals on
G 1/2	ISO 228-1 (BSPP)	0.38 mm smaller in diameter; same pitch	55°	Gasket / O-ring
R 1/2	ISO 7-1 (BSPT)	0.38 mm smaller in diameter; same pitch	55°	Thread + sealant

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