SteveW Posted February 26, 2014 Share Posted February 26, 2014 Does anyone know what the thread is on the cat to y pipe studs on the 350? I'm replacing them all on mine as badly corroded when I put my new exhaust on. However just called in at a bolt specialist and they think it's (took an old one in with me) M9x1.25 but didn't have any in stock. Can anyone confirm the size so I can order off the web? Thank you Steve Quote Link to comment Share on other sites More sharing options...
eatonm90 Posted February 26, 2014 Share Posted February 26, 2014 Hi, size is M10 x 1.25. Did mine with flanged stainless nuts but could only find them on Ebay. They fit Ducatti chain sprockets I think. Quote Link to comment Share on other sites More sharing options...
SteveW Posted February 26, 2014 Author Share Posted February 26, 2014 Cheers mate I'll have a look Quote Link to comment Share on other sites More sharing options...
SteveW Posted February 27, 2014 Author Share Posted February 27, 2014 I've checked the nuts with some plug gauges at work and it's not m10 x 1.25. We thought it was 3/8 UNF but then the pitch was wrong. It seems to be M9 x 1.25........gash Quote Link to comment Share on other sites More sharing options...
gsexr Posted February 27, 2014 Share Posted February 27, 2014 These guys may be able to help http://www.namrick.co.uk/ Quote Link to comment Share on other sites More sharing options...
eatonm90 Posted February 28, 2014 Share Posted February 28, 2014 I've checked the nuts with some plug gauges at work and it's not m10 x 1.25. We thought it was 3/8 UNF but then the pitch was wrong. It seems to be M9 x 1.25........gash Bit bizarre that, def won't be imperial size..M9 would be a specialist size. If I get time I will measure up the old ones I took off mine. Quote Link to comment Share on other sites More sharing options...
SteveW Posted February 28, 2014 Author Share Posted February 28, 2014 That's what I thought too. I know I could just drill them all out but under the car doing it isn't that easy due to access. I've been into stores at work today and tried pretty much every bolt we had. The only one I can find that fits is a 3/8 BSF. It feels a little loose but that could be because my old nut is corroded to hell. Quote Link to comment Share on other sites More sharing options...
gsexr Posted February 28, 2014 Share Posted February 28, 2014 This might help mate as it mentions the sizes http://www.berktechnology.com/content/downloads/BERK_MANUAL_350Z-G35_Test_Pipes.pdf Quote Link to comment Share on other sites More sharing options...
SteveW Posted February 28, 2014 Author Share Posted February 28, 2014 Thanks for that mate, however because you remove the cats when you fit the down pipes I think Berks have just used new bolts that are a different size that fit through the OEM Y-Pipe holes. I know I could go to Nissan but I bet they want £5 per nut at least lol. Quote Link to comment Share on other sites More sharing options...
eatonm90 Posted February 28, 2014 Share Posted February 28, 2014 measured up my old ones that I took off the car (DE engine) and mine are definitely 10mm with a 14mm hex small flange. Really don't know what you have but if they are original they should be a mass produced size. Quote Link to comment Share on other sites More sharing options...
SteveW Posted February 28, 2014 Author Share Posted February 28, 2014 Thanks for measuring yours up mate, appreciate it. Maybe mine are just that badly corroded that they are no longer m10 x 1.25. I'll buy some m10 x 1.25 nuts and try them on the studs. Mine took a 13mm hex and were loose in it, shows how corroded they are! Quote Link to comment Share on other sites More sharing options...
SteveW Posted March 8, 2014 Author Share Posted March 8, 2014 I can now definitely confirm the OE studs are M10 x 1.25 (M10 Fine) It's simply that 3/8" BSF has a pitch of 1.27mm Sent from my iPad using Tapatalk Quote Link to comment Share on other sites More sharing options...
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