1/2 NPT thread characteristics, identification, and application

1/2 NPT (National Pipe Taper) thread is a tapered pipe thread commonly used in hydraulic, pneumatic, and pressure systems. The "NPT" designation indicates an American National Standard Pipe Taper thread, with an angle of 60°, and the outside diameter gradually decreases towards the end, enabling a tight seal without the need for additional flat gaskets. For the 1/2 NPT size, the number of threads is 14 per inch, and the outside diameter is approximately 20.9 mm.

1 2 tapered thread dimensions

1/2 NPT thread characteristics

• Thread type: tapered

• Standard: ANSI/ASME B1.20.1

• Thread angle: 60°

• Number of threads: 14 threads/inch

• Outside diameter: approx. 20.9 mm

• Sealing: through tapered self-clamping, optionally using PTFE tape or sealing paste

Identification of 1/2 NPT thread

The thread can be recognized by its slightly tapered shape (decreasing diameter towards the end) and a larger thread angle compared to BSP threads. Measuring the outside diameter in the range of 20.5–20.9 mm and the number of threads (14 per inch) allows for the clear identification of the thread as 1/2 NPT.

Application of 1/2 NPT thread

1/2 NPT thread is widely used in:

• power and industrial hydraulics,

• pneumatic systems,

• liquid and gas transport systems,

• connections for pressure gauges, sensors, and valves,

• fuel, cooling, and oil systems.

Why choose NPT threads from the Hydron offer?

Hydron, with over 20 years of experience in power hydraulics, offers a wide selection of connectors and fittings with NPT threads. All products available in the store www.sklep.hydron.com.pl meet quality requirements and comply with current standards, ensuring safety and leak-tight connections in the most demanding applications.

Technical parameters of 1/2 NPT:

• Standard: ANSI/ASME B1.20.1

• Thread angle: 60°

• Type: Tapered

• Number of threads/inch: 14

• Outside diameter range: 20.5–20.9 mm

• Seal type: tapered self-clamping or PTFE sealant