When it comes to measuring pipe threads, various gauges are used to ensure accuracy and compatibility. In this blog article, we will explore the differences between three commonly used pipe thread gauges: ANPT L1 plug gauge, ANPT L3 gauge, and ANPT 6-step plug gauge.
1. ANPT L1 Plug Gauge:
The ANPT L1 plug gauge is designed to measure the internal threads of a pipe. It has a tapered end with a specific angle and pitch that matches the corresponding pipe thread. The L1 designation indicates that it is a plug gauge used for checking the tightness and accuracy of the threads. This gauge is used to ensure that the internal threads of a pipe meet the required specifications and can properly accommodate a mating external thread.
2. ANPT L3 Gauge:
The ANPT L3 gauge, also known as a ring gauge, is used to measure the external threads of a pipe. It has a cylindrical shape with a threaded inner surface that matches the specific pipe thread. The L3 designation indicates that it is a gauge used for checking the external threads. This gauge is used to ensure that the external threads of a pipe meet the required specifications and can properly engage with a mating internal thread.
3. ANPT 6-Step Plug Gauge:
The ANPT 6-step plug gauge is a specialized tool used to measure the pitch diameter of a pipe thread. It consists of six steps, each with a different diameter, allowing for the measurement of various thread sizes. This gauge is used to verify the pitch diameter of the threads, ensuring that it falls within the specified tolerance range. It is commonly used in quality control and inspection processes to ensure the accuracy and compatibility of pipe threads.
In summary, the ANPT L1 plug gauge is used to measure the internal threads of a pipe, the ANPT L3 gauge is used to measure the external threads, and the ANPT 6-step plug gauge is used to measure the pitch diameter of the threads. Each gauge serves a specific purpose in ensuring the accuracy and compatibility of pipe threads. By using these gauges, manufacturers can maintain quality control standards, ensure proper thread engagement, and avoid potential leaks or failures in pipe connections.
