NPT Thread and Pipe Sizing:
NPT (National Pipe Thread) is a standard used in joining pipes and fittings that have a tapered thread. As a general rule, the NPT inch size is the inside diameter of the threaded pipe and is known as the NPS (Nominal Pipe Size). The outer diameter (OD) of the pipe is shown in the table below:

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RAM Single Socket Arm & 1/4″ NPT
Female Thread for 1″ Ball Bases

The RAM-B-200-1U includes a single socket that will accommodate 1″ balls and a 1/4″ NPT Female thread. This part will connect to 1/4″ NPT Male threads, including the RAM-PF-585-XX flex arms and RAM-PA54XX rigid arms.

Powder Coated Marine Grade Aluminum

Ball Size:
1″ Rubber Ball “B” Size