What is the approximate number of threads to cut when installing 1/2" and 3/4" black iron pipe to a natural gas furnace?

When installing black iron pipe for a natural gas furnace, it is essential to properly prepare the ends of the pipe by cutting threads. The range of 8-10 threads is typically recommended for both 1/2" and 3/4" black iron pipe connections.

This number of threads ensures a secure connection that can handle the pressure of natural gas while minimizing the chance of leaks. Proper threading helps provide enough surface area for the threads to engage with the fittings effectively, allowing for a reliable and tight seal. Insufficient threading may result in weak connections that could compromise the integrity of the gas line.

Additionally, industry standards and practices favor this range of threads to ensure that the connections meet safety codes and performance requirements. Having the right number of threads also aids technicians in achieving a proper torque when tightening fittings, which is crucial for avoiding leaks and ensuring the long-term reliability of the gas supply to the furnace.