mjc Posted June 12, 2014 Report Share Posted June 12, 2014 Hi Can someone please tell me what the size of the thread is for the clutch master cylinder pipe union. I've got the 1/4 inch pipe but can't find the thread size anywhere for the male union. Many thanks Mike Quote Link to post Share on other sites
jerrytr5 Posted June 16, 2014 Report Share Posted June 16, 2014 3/8 unf isn't it? Quote Link to post Share on other sites
mjc Posted June 16, 2014 Author Report Share Posted June 16, 2014 Hi Jerry I think it's 3/8 UNF as well, but I can't find 3/8 male union for a 1/4 inch pipe anywhere. Mike Quote Link to post Share on other sites
jerrytr5 Posted June 16, 2014 Report Share Posted June 16, 2014 https://www.merlinmotorsport.co.uk/p/brake-union-male-unf-pack-of-10-bbu-m-u check they're for the 1/4" pipe first. Jerry. Quote Link to post Share on other sites
mjc Posted June 17, 2014 Author Report Share Posted June 17, 2014 Just spoken to Automec. A 3/8 thread is too small for a 1/4 inch pipe. Looks like I have been sold the wrong master cylinder at Stoneleigh. Mike Quote Link to post Share on other sites
mjc Posted June 17, 2014 Author Report Share Posted June 17, 2014 The picture on rimmers website shows an adapter to take a 1/4 inch pipe union. I've ordered an adapter from Automec. Hope that sorts the problem. http://www.rimmerbros.co.uk/Item--i-148531 Mike Quote Link to post Share on other sites
BlueTR3A-5EKT Posted June 19, 2014 Report Share Posted June 19, 2014 It is 7/16 x 20. A standard sized imperial brake hydraulic thread Item 56 BHA 4706 http://www.moss-europe.co.uk/Shop/ViewProducts.aspx?PlateIndexID=2488 It is all in the book we wrote 20 years ago. Cheers Peter W Quote Link to post Share on other sites
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