Graham Posted June 28, 2017 Report Share Posted June 28, 2017 I purchased a rather cheap (should have known!) pipe expander on first use the nut stripped ! give the seller his due he did give me a full refund and I still have 2 of the set of 3 expanders, but looking to see if I can replace the stripped nut, the pitch appears to be 1.25 and the std size is curiously 12.5mm any thoughts on what size nut I need as I thought if it was M12 it would have been a 12mm stud ? and since its a cheap Chinese bit of kit can't the threads would be imperial ? Quote Link to post Share on other sites
Lebro Posted June 28, 2017 Report Share Posted June 28, 2017 Can't find any imperial threads that match, but the Extra Fine metric thread is close at 12mm dia, & 1.25 pitch. https://www.google.co.uk/#q=fine+metric+treads&spf=1498647357747 Bob. Quote Link to post Share on other sites
Eddie Cairns Posted June 28, 2017 Report Share Posted June 28, 2017 Looks like 1/2" UNF if you look here https://www.austain.com.au/useruploads/files/austain_technical_information_sheet_imperial_tpi_table.pdf Quote Link to post Share on other sites
john.r.davies Posted June 28, 2017 Report Share Posted June 28, 2017 (edited) I also have a crap pipe expander. This one broke one of the cones! Examination found it to be some sort of sintered casting, with more voids in than an Aero bar. Recommendations of better quality, please? John Edited June 28, 2017 by john.r.davies Quote Link to post Share on other sites
Graham Posted June 28, 2017 Author Report Share Posted June 28, 2017 I also have a crap pipe expander. This one broke one of the cones! Examination found it to be some sort of sintered casting, with more voids in than an Aero bar. Recommendations of better quality, please? John John you must have had a good set then, with mine the nuts are so soft they fail even before the pipe expands ! Quote Link to post Share on other sites
BlueTR3A-5EKT Posted June 29, 2017 Report Share Posted June 29, 2017 (edited) 1/2" x 20 tpi perhaps. 20 tpi is 0.050" pitch ... which is about 1.25 mm ... 1mm being 0.040" Same as thread size as TR2-4 cyl head nut Peter W Edited June 29, 2017 by BlueTR3A-5EKT Quote Link to post Share on other sites
john.r.davies Posted July 1, 2017 Report Share Posted July 1, 2017 (edited) Graham has kindly offered to send me thwe conical spreaders from his set, incase they will suit mine. I've given him the dimensions, and here's a pic for comparison. MY repaired spreader is on the left, but I haven't dared use it since! John Edited July 1, 2017 by john.r.davies Quote Link to post Share on other sites
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