Why drill a hole when you don't have to. Make use of existing plugged holes on your machine. The CMCP203 Pipe Thread Mounting Adapter is made of 316 Stainless Steel and surfaced for accelerometer mounting. The CMCP203 Pipe Thread Mounting Adapters provide a mounting location for permanently mounted accelerometers. They are are provided in both several NPT sizes to accommodate the most common plugs found on most machinery. The adapters have a 1/4”-28 UNF threaded hole to mate with the most common accelerometers and vibration transmitters.