NPT Thread Dimensions

A National Pipe Thread (NPT) gauge is a tool used to verify the accuracy of tapered threads on pipes and fittings. NPT threads are commonly employed in North America for pipe connections, particularly in plumbing systems and industrial applications.

Key Features:

• Tapered Threads: NPT threads are tapered, meaning they narrow towards the base. This creates a leak-proof seal when male and female threads are screwed together.
• ANSI/ASME B1.20.1 Standard: NPT thread gauges are manufactured to this standard, ensuring thread compatibility and precision.
• Usage: The thread gauge measures threads per inch (TPI) and verifies thread angle and depth to ensure conformity to NPT specifications12.

Typical Use:

1. Identification: Determine whether the fitting is male or female.
2. Measurement: Use the gauge to measure threads per inch and verify the taper.
3. Verification: Ensure threads meet specifications for a secure, leak-free connection