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The precise value depends only on the wall thickness and the internal pressure.

If the wall thickness is 5mm then the inside radius is 510mm.

The tubes sought by Iraq had a wall thickness of 3.3 millimeters.

The size of a part puts a limit on how thin the wall thickness can be.

Diffusion is a slow process so the change in wall thickness takes a lot longer.

This is to accommodate the wall thickness as needed.

However, because cores were often off center, the wall thickness determined the size of the bore.

Does not require a uniform wall thickness, allowing for greater design flexibility of your base.

The average wall thickness was the difference of the two diameters divided by 2.

If a tube is used, the wall thickness also has an impact on the tone.