In industrial production, threaded connectors are key components for connecting pipes and equipment, and their importance is self-evident. The three mainstream connector standards of metric, American, and British have their own characteristics and are widely used in different fields and equipment. Correctly distinguishing these types of connectors is not only a necessary skill for engineering and technical personnel, but also an important guarantee for ensuring the safe operation of equipment and improving production efficiency.

 

1. Metric connector

Metric connectors use the International System of Units, with a thread angle of 60 degrees and a symmetrical triangle tooth shape. Its specifications start with "M", such as M10, which means the nominal diameter is 10mm. Metric connectors are concisely marked and easy to identify, and are widely used in mechanical equipment, automobile manufacturing and other fields.

 

 

2. American connectors

American connectors use the unified thread standard (UN), and the thread angle is also 60 degrees, but the tooth shape is slightly different from the metric system. Its specifications are expressed in fractional form, such as 1/4"-20 means a nominal diameter of 1/4 inch and 20 threads per inch. American connectors are widely used in North America and are commonly found in petrochemical equipment.

 

3. British connectors

British connectors use the Whitworth thread standard (BSW), with a thread angle of 55 degrees and a rounded thread profile. Its specifications are also expressed in fractional form, such as 1/2"-12 means a nominal diameter of 1/2 inch and 12 threads per inch. British connectors are mostly used in Commonwealth countries and are more common in shipbuilding and aviation industries.

 

When distinguishing these three types of connectors, first observe the thread angle and thread profile characteristics, and then check the specification marking method. In actual work, a thread gauge can be used for precise measurement. For connectors in key areas, Liwang Fluid Technology Department recommends that you use original accessories or certified substitutes to ensure connection reliability. The specific distinction method is as follows: First, observe the thread angle and tooth type. The angle of metric and American standard threads is 60 degrees, while the angle of British standard threads is 55 degrees. In addition, the tooth type of metric threads is symmetrical, while the tooth type of British standard threads is more rounded. Secondly, check the specification marking method. Metric threads usually start with "M", while American standard and British standard threads are expressed in fractional form. Finally, use measuring tools such as thread gauges or calipers to accurately measure the diameter, pitch and angle of the thread to further confirm the type of connector. Through these steps, metric, American standard and British standard connectors can be effectively distinguished to ensure the selection of appropriate accessories.

 

Precautions

Liwang Fluid reminds you: In actual applications, be sure to avoid mixing connectors of different standards to prevent serious consequences such as leakage, looseness and even equipment damage due to mismatched specifications. For critical equipment or high-precision scenarios, give priority to original accessories or authoritatively certified substitutes to ensure the safety, reliability and long-term stability of the connection. At the same time, it is recommended to regularly check the use status of the connector and replace aging or worn parts in time to ensure the normal operation and production efficiency of the equipment.