GPBox Posted September 25, 2018 Share Posted September 25, 2018 Hi all....fitting a side impact bar...need to get a longer bolt which attaches the rear A-frame just in-front on the rear wheels..to the chassis.thought it was an M12....but threads are finer than bolt I've just bought from Caterham...this one...https://caterhamparts.co.uk/search?controller=search&orderby=position&orderway=desc&search_query=BM12X105S72&submit_search=ideas ?thanks,. Graham Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted September 25, 2018 Member Share Posted September 25, 2018 Imperial (from Shaun's bolt list):Metric (from fastgrandad's Fastener Packs):Jonathan Link to comment Share on other sites More sharing options...
GPBox Posted September 25, 2018 Author Share Posted September 25, 2018 Thanks Jonathan, does that mean I can use either ?.....but looks like the bolt I have bought is not a fine thread ?....thanks Link to comment Share on other sites More sharing options...
Support Team Shaun_E Posted September 25, 2018 Support Team Share Posted September 25, 2018 Which chassis do you have? If you don’t know then what year is the car?It does need a fine thread.. Link to comment Share on other sites More sharing options...
GPBox Posted September 25, 2018 Author Share Posted September 25, 2018 2003...K Link to comment Share on other sites More sharing options...
ChrisC Posted September 25, 2018 Share Posted September 25, 2018 I think that Metric bolt is wrong, let me check.Edit - Sorry my mistake, I was think of the A frame, to Dedion tube, which is imperial, on metric cars. Link to comment Share on other sites More sharing options...
leo_71 Posted September 25, 2018 Share Posted September 25, 2018 M12 coarse series has a pitch of 1.75mm M12 fine series has a pitch of 1.25mm Link to comment Share on other sites More sharing options...
aerobod - near CYYC Posted September 25, 2018 Share Posted September 25, 2018 M12 is also available in 1.50mm pitch (normally referred to as fine, compared with extra or super fine for 1.25mm pitch). This is a very common pitch for automotive applications. Link to comment Share on other sites More sharing options...
Area Representative paul richards Posted September 25, 2018 Area Representative Share Posted September 25, 2018 I suspect it might be 1/2 inch UNF. Link to comment Share on other sites More sharing options...
Area Representative Richard Price Posted September 26, 2018 Area Representative Share Posted September 26, 2018 I'd agree with Paul!a 2003 car will be imperial, so its 1/2" UNF Link to comment Share on other sites More sharing options...
rj Posted September 26, 2018 Share Posted September 26, 2018 #metoo Link to comment Share on other sites More sharing options...
GPBox Posted September 26, 2018 Author Share Posted September 26, 2018 thanks all....yep..its a 1/2" UNF...confirmed by my local nut n bolt specialist !! Link to comment Share on other sites More sharing options...
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