Circular connector thread adapters are available in a variety of sizes to accommodate different connector types and applications. The sizes are typically defined by the diameter and thread pitch, which are standardized according to industry norms. Common sizes include:
1. **M8, M12, M16, M23**: These are metric sizes commonly used in industrial automation and sensor applications. The number indicates the diameter in millimeters.
2. **5/8-24, 7/16-28, 1/4-28**: These are examples of sizes using the Unified Thread Standard (UTS), where the first number represents the diameter in inches and the second number represents the number of threads per inch.
3. **MIL-DTL-38999 Series**: These military-grade connectors come in various sizes, such as 8, 10, 12, 14, 16, 18, 20, 22, and 24, which refer to the shell size and are often used in aerospace and defense applications.
4. **NPT (National Pipe Thread)**: Sizes like 1/8", 1/4", 3/8", and 1/2" are used for applications requiring a tapered thread for sealing.
5. **PG (Panzer-Gewinde)**: Sizes such as PG7, PG9, PG11, PG13.5, PG16, etc., are used in European applications, particularly for cable glands.
6. **BSP (British Standard Pipe)**: Sizes like 1/8", 1/4", 3/8", and 1/2" are used in plumbing and hydraulic systems.
These sizes ensure compatibility with various equipment and systems, and the choice of size depends on the specific requirements of the application, such as the type of connection, environmental conditions, and mechanical strength needed.