All of these thread adapters have one 1/8" NPT female end to fit our hoses. The other end is available in several different thread types to fit your bearing's grease port thread.
Our grease extension hoses come with a 1/8″ NPT male thread on the bearing end of the hose. This 1/8″ thread will fit roughly 60% of grease ports without needing a thread adapter. However, not all bearings have this common grease port thread. Grease fitting thread adapters will allow our grease extension hoses to be used with other grease port threads.
The two most common grease port threads are the 1/8″ NPT thread (installed on our grease relocation hoses) and the 1/4″-28 thread. These two threads are used on the majority of bearing grease ports in the US. See the chart below. Other threads are less common but are found in about 10% of applications.
For information on identifying your bearing thread, see our Grease Fitting Thread Identification page.
Thread Adapters are galvanized steel
Bearing Grease Port Threads - Based on Our Sales Data
|60% of bearings||1/8" NPT thread|
|30% of bearings||1/4"- 28 SAE thread|
|All remaining bearings (10%)||All other threads|