Jamiejimbob Posted July 3, 2016 Report Share Posted July 3, 2016 So I've got hold of a set of front fenders for my 45 dodge a hundred miles up the road from me which in the UK is amazing really! My pickup currently doesn't have any fenders on so I don't have an idea what bolts hold on the fenders. As the UK is also mainly metric your average motor store doesn't have imperial bolts so I have to order them. Does anyone know what size bolt and type of thread? they look about 1/4 inch Thanks Jimbo Quote Link to comment Share on other sites More sharing options...
TodFitch Posted July 3, 2016 Report Share Posted July 3, 2016 Can't say for sure on your truck but many/most of the bolts holding the fenders of my old Mopar are UNC 1/4-20 though some might be UNC 5/16-18. Main reason for my reply here though is to point out "Imperial" is probably not a good term for the fasteners. There are/were a number of standards based on the inch system and the threads for them are not all interchangeable. At least not interchangeable if you are worried about having the fasteners perform their best. In the US the standards set by the S.A.E. which lead to the Unified Thread Standard predominate while in the U.K. I understand that other standards, like Whitworth, were often used. Quote Link to comment Share on other sites More sharing options...
Jamiejimbob Posted July 3, 2016 Author Report Share Posted July 3, 2016 Thanks for the info I realise imperial might be a broad term to use. You have confirmed my original thought that they maybe 1/4" so I'll try that and see. how I get on. Quote Link to comment Share on other sites More sharing options...
Young Ed Posted July 3, 2016 Report Share Posted July 3, 2016 The only lower grill I have around is a 40 plymouth but the threads on that one are 5/16-18. I would guess it's the same as the rest of the 39-47 trucks. Quote Link to comment Share on other sites More sharing options...
Jerry Roberts Posted July 3, 2016 Report Share Posted July 3, 2016 1/4 inch is too small . At least 5/16 inch . Quote Link to comment Share on other sites More sharing options...
Desotodav Posted July 3, 2016 Report Share Posted July 3, 2016 It's funny as we here in Australia use thread terms as either 'metric' or 'imperial'. Looking back at one of the invoices for bolts I purchased in May 2015, the majority of them for the 53 truck build were 5/16 UNF 24(tpi)x3/4(long) - price was $14.58 per 100. I suspect that the early trucks would use the same. 1 Quote Link to comment Share on other sites More sharing options...
Don Coatney Posted July 3, 2016 Report Share Posted July 3, 2016 Engine hardware is usually fine thread grade 8. Body hardware is usually coarse thread grade 5 or less. If the bolt or nut requires a 7/16" wrench then it is a 1/4" assuming it meets the national standard. National standard charts are available by doing a google search. Quote Link to comment Share on other sites More sharing options...
rb1949 Posted July 3, 2016 Report Share Posted July 3, 2016 Screw in a bolt to find out? Quote Link to comment Share on other sites More sharing options...
Dave72dt Posted July 4, 2016 Report Share Posted July 4, 2016 I just checked the fender to grille bolts on my B3B. Those are 5/16 x 24 and would suspect the same o n your '45. Use of fine threaded bolts seemed to be very common during that era. Grab an 8mm x 1.25 bolt and see how well it fits the hole. About half a thread in will be all you get but if it wants to start, order the 5/16. Way big, order the 1/4. Quote Link to comment Share on other sites More sharing options...
Jamiejimbob Posted July 14, 2016 Author Report Share Posted July 14, 2016 Hi guys Thanks for the info and help. It was 5/16 UNC Here's a pic of a trial fit just to see what it looks like. 2 Quote Link to comment Share on other sites More sharing options...
FlashBuddy Posted July 13, 2018 Report Share Posted July 13, 2018 Geewhiz, I was hoping we would see the final fitted and painted results?! Quote Link to comment Share on other sites More sharing options...
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