bobrogg Posted May 25, 2013 Report Share Posted May 25, 2013 I'm replacing my trunk lock and found two of the four screws missing that hold the assembly to the trunk, the other two screws have striped heads and will need to be drilled out. The Triumph parts catalog shows those screws as part number 518104 but they do not tell me the bolt/thread size. Anyone know what size these bolts are? many thanks, Bob Quote Link to post Share on other sites
RogerH Posted May 25, 2013 Report Share Posted May 25, 2013 Hi Bob, it will be UNF - either 10/32 or 1/4. Roger Quote Link to post Share on other sites
stuart Posted May 25, 2013 Report Share Posted May 25, 2013 They are 10/32 UNF. Stuart. Quote Link to post Share on other sites
bobrogg Posted May 25, 2013 Author Report Share Posted May 25, 2013 They are 10/32 UNF. Stuart. Thanks for the info, that really helped me with this project Quote Link to post Share on other sites
bobrogg Posted May 26, 2013 Author Report Share Posted May 26, 2013 I finally finished getting the boot lid lock replacement. I had to drill out two of the screw holding it to the car and then had to drill out the two rivets holding the lock plate to the lock mechanism before I could unscrew the lock from the mounting plate. As my luck would have it the screws on the old lock would not fit the new, I had to use my tap and die set to open the holds to 6/32 before I could reassemble. now everything fits and works perfectly. Quote Link to post Share on other sites
RogerH Posted May 26, 2013 Report Share Posted May 26, 2013 the holds to 6/32 before I could reassemble. now everything fits and works perfectly. Hi Bob, these simple jobs never seem to be. What is this 6/32 you refer to - that is very small. Roger Quote Link to post Share on other sites
Edwin Posted May 26, 2013 Report Share Posted May 26, 2013 Just took out these screws from my 6 and they are indeed 3/16 UNF... which is about the same as 6/32... no. 72 on this page: http://www.rimmerbros.co.uk/Item--i-GRID006943 Cheers, Edwin Quote Link to post Share on other sites
stuart Posted May 26, 2013 Report Share Posted May 26, 2013 (edited) There is no such thread size as 3/16 in UNF. Thats the spanner size. http://www.carbidedepot.com/formulas-tap-standard.htm It was the thread size that was requested and all the ones I have done have had 10/32 screws fitted. (FWIW 2BA will also fit) 6/32 is very small indeed and is a UNC (coarse) thread.. Stuart. Edited May 26, 2013 by stuart Quote Link to post Share on other sites
Edwin Posted May 26, 2013 Report Share Posted May 26, 2013 Then the info on a site I checked must be wrong. I ordered a whole bunch of UNF bolts a couple of years ago from them and they have a 3/16 UNF bolt listed, varying in length from 1/2" to 2".... But it must be UNC instead of UNF then... learning more everyday, thanks for the lesson Stuart.. Quote Link to post Share on other sites
RogerH Posted May 26, 2013 Report Share Posted May 26, 2013 Hi Edwin, the Americans (I think) had/have a fancy way of naming metal screws. They named them after wood screws ie 6, 8, 10, 12 etc then added the thread TPI. So a 10/32 has a diameter of a #10 wood screw with 32TPI Once they got near 1/4" they stopped and followed the English (wise move) As it happens the #10 screw is apprx 3/16" diameter hence your 3/16 UNF - sadly there is not 3/16 UNF but a 10/32 UNF Roger Quote Link to post Share on other sites
BlueTR3A-5EKT Posted May 26, 2013 Report Share Posted May 26, 2013 (edited) Thread nomenclature. 10 refers to the rod diameter the bolt or screw is made from ie number 10 in the SAE sizing charts. 32 is the thread pitch per inch ie crests per inch. UNF is the thread form ie 60 degree angle. This is useful http://www.leytonfasteners.co.uk/pdfs/UN%20Thread%20Chart.pdf Or http://www.marylandmetrics.com/tech/THREAD%20IDENTIFICATION%20CHART.pdf Cheers Peter W Edited May 26, 2013 by BlueTR3A-5EKT Quote Link to post Share on other sites
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