For a strange theatrical reason I had to use the above on some 21mm steel pipe today and the Lithuanian labourer who was showing me how this strange machine worked wanted to know why the die was marked as 1/2", I just put it down to plumbing sizes being weird but that is a big difference. What is the answer?
No, now I've got to try to explain that to a Lithuanian with poor English, It was designed for very thick pipe.
He could batter me despite being 10 years older, the tube we have isn't for plumbing so all the sizes and wall thicknesses are different.
BSP is not metric. When the UK was planning to be metric in the 1960s, the French, the inventors of the metric system, pleaded to retain imperial BSP. Why? Because they had adopted it for pipe sizes and deemed it was too problematic to convert 100% to metric screw thread sizes. The pitch of the threads are imperial in BSP. The French today use imperial BSP but call it 21mm. The threads pitch is still imperial.
You need to get a life Joe understood what I was telling him and for some reason the pipe I was using was 1/2" id, he reckoned it was a stupid way of describing it as well.
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