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I would file off about 2/3mm in the middle to get the curvature
If you're just doing a practical (rather than pretty) weld on job, I wouldn't bother to relieve the back to sit close to the tube. Welding will easily bridge the gap, and you won't lose any of the threads. A good close fit across the whole joint surface is only really necessary if you're brazing the lug onto the tube.
If you want lots of thread so that you have some length to play with to make it pretty, get a stud connector
gbj_tester-
get a stud connector
Ah, good idea.
I wouldn't bother to relieve the back to sit close to the tube. Welding will easily bridge the gap, and you won't lose any of the threads.
Ah, thanks for clearing that up. May still go for it: gives me an excuse to update my files and if its wonky, it'll be getting on my nerves.
HHC
^^ @freezing77
Yeah, but was thinking that a nut wouldn't have as much purchase on the bolt - especially when filled down to have some curvature - than something a more specific in design. That said, upon inspection of the B&Q website they're more appropriate than I had thought.
^ @mdcc_tester
Thanks, glad to hear its plausibility coming from you.
Will be asking around for weld nuts in the local shops tomorrow.
One day I will have a nice tap and die set but today is not that day.
Upon looking at some examples of grub screw 'seatpins' and their widths would basically any of these be suitable (provided they're steel) with regard to their widths/amount of thread (especially since I would file off about 2/3mm in the middle to get the curvature - should I bother?)?