Got it for AR assembly and it is the cheapest way to get it.
Works properly and at a good price!
Have been using Rustlick 606 in my automotive machine shop for over 40 years. Crank shafts, heads and blocks.
RAM Mounts
(Backordered) Normally Available within 10–12 Days.
SKU:RAM-B-218-1U
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Ram - 1/4 Npt Female Threaded Hole Base With 1 Ball 2/1 Balls | RAM-B-218-1U
The RAM-B-218-1U consists of a 1" ball and 0.25" NPT female thread. This part connects to any 0.25" NPT male thread, including RAM-PF-585-X flex arm series mounts and RAM-PA54XX rigid arm series mounts. 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:
| Nominal Pipe Size (NPS) | OUTER DIA. (OD) | THREADS PER INCH |
| 0.25 | 0.540 | 18 |
| 0.50" | 0.840" | 14 |
| 1" | 1.315" | 11.5 |
Material: Powder Coated Marine Grade Aluminum
Ball Size: 1" Rubber Ball "B" Size
Note: The "U" in the part number reflects product packaged in poly bag.

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Got it for AR assembly and it is the cheapest way to get it.
Works properly and at a good price!
Have been using Rustlick 606 in my automotive machine shop for over 40 years. Crank shafts, heads and blocks.
Correct part. Fast and friendly service.