Adapter testo 0554 3113 for refrigerant hoses — 1/4 inch to 5/16 inch SAE and 7/16 inch to 1/2 inch UNF

Mechanical adapter testo 0554 3113 for refrigerant and service hoses provides reliable thread conversion between 1/4" and 5/16" SAE and between 7/16" and 1/2" UNF. Designed for HVAC/R charging and diagnostic equipment, the adapter enables a secure mechanical connection of hoses and gauges with differing thread standards used in refrigerant handling and measurement operations.

Advantages

The adapter offers a compact, mechanically robust solution for converting between SAE and UNF fittings without requiring additional tools. Its precision-machined threads ensure leak-minimised connections and consistent engagement with refrigerant hoses and service ports. The small form factor supports easy handling in confined installation spaces while maintaining the mechanical strength necessary for safe charging and diagnostic work.

Suitable for

Key specifications

How to use

Before use, verify that both mating threads are clean and free of debris. Hand-start the adapter into the target fitting to ensure correct thread engagement, then tighten by hand and finish with an appropriate wrench if required, taking care not to over-torque. After connection, perform a pressure check or leak test in accordance with standard refrigerant handling procedures. Use only with compatible hoses, gauges and service ports rated for the refrigerant and operating pressures in your system.

Recommendations

For safe and reliable operation, inspect threads for wear or damage before each use and replace the adapter if any deformation or excessive wear is detected. Follow applicable HVAC/R safety guidelines and refrigerant handling regulations, and use leak-detection methods after installation to confirm a tight seal.