Dave Clasper Posted November 2, 2021 Share Posted November 2, 2021 Hi. Have just bought a cheapish one, to fit one new copper brake pipe. The description implied it was suitable for 3/16" pipe, though it's actual size is maybe a metric equivalent of 5mm. This makes it larger than 3/16", by 0.24mm. Would this size tool work and also be safe? Thanks, Dave Quote Link to comment Share on other sites More sharing options...
mikeyb Posted November 2, 2021 Share Posted November 2, 2021 Most decent tools like Sykes have metric and imperial formers. Suggest do a test form on a bit of spare pipe if you havn't already done so to get to this point and compare with an original. Me personally, would not take a chance knowingly mixing metric and imperial. Quote Link to comment Share on other sites More sharing options...
drofgum Posted November 3, 2021 Share Posted November 3, 2021 Dave, The usual small metric size tubing is 4.75mm. When you check that against 3/16" you will find the difference is less than 0.010", close enough to work as designed. However the ISO flare has a slightly different form to the Imperial flare. Regards, Paul Quote Link to comment Share on other sites More sharing options...
Dave Clasper Posted November 3, 2021 Author Share Posted November 3, 2021 (edited) Thanks. This kit is sized as metric (aside from a 1/4 one?) For the clamp holes and dies. As well as the 5mm size, there is a 4.75mm size, which I didn't notice at first. I assume this will be the size to match 3/16" pipe?. Though I assume this may be a grey area "wouldn't like to comment" regarding the slightly different met/imp profiles? If so I can return it and purchase an imperial sized tool. Cheers for your imput, much appriciated. Dave Edited November 3, 2021 by Dave Clasper Quote Link to comment Share on other sites More sharing options...
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