boggie Posted May 7, 2017 Report Share Posted May 7, 2017 Hi all, I am resoring the tank on our post-TS60000 TR3a. I have POR15 flushed, degreased and metal prepped the tank inside ready for the liner/sealer unce it is all dry. I want to clean up the union threads on the outlet and breather but am struggling to identify thread type so I can get the right tap and die set so need some help please... The diameter of the male connector is 0.51" and measuring between the peaks across 4 threads is 0.16". All this seems to suggest is a 1/2" 18tpi thread but this is an odd size. The only listing i can find is for a 1/2"UNS. Does anyone know for sure what size the tank unions are please? Thanks, Ian Quote Link to post Share on other sites
Lebro Posted May 7, 2017 Report Share Posted May 7, 2017 ¼" BSP is 0.518 O/D & 19 TPI. Your measurement across 4 peaks is 3 threads so 18.75 TPI If 19 TPI then measurement across 4 peaks would be 0.15789" Bob. Quote Link to post Share on other sites
boggie Posted May 10, 2017 Author Report Share Posted May 10, 2017 Ah, I had counted the thread at the start of the inch too.... Allowing for the slight inaccuracies in only being able to measure across 4 threads it sounds like I might need to get a set of BSP taps and dies... Does anyone know for sure if this is correct for the tank unions please? Quote Link to post Share on other sites
BlueTR3A-5EKT Posted May 10, 2017 Report Share Posted May 10, 2017 (edited) I have been fitting the elbow and pipe from the TR4-6 (149556) in the tank. - I have a couple of NOS of the tube nuts with both 1/4 & 5/16 pipes and olives fitted. PM me if you want one posted to UK for £5.00 It is 1/2" x 20 UNF threaded. - It fits tank and pump. Peter W Edited May 10, 2017 by BlueTR3A-5EKT Quote Link to post Share on other sites
boggie Posted May 11, 2017 Author Report Share Posted May 11, 2017 Interesting, thanks Peter. I have a comprehensive set of UNC/UNF taps and dies but mothing seemed to match and none of the thread gauges matched. I will check again and make sure I try a 1/2"UNF20. Quote Link to post Share on other sites
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