Titanium bolts, BSF and cycle thread
Made some BSF and cycle thread titanium bolts for a long standing customer yesterday. The heads are to fit Whitworth spanners and are slightly domed. They are going on a very special Matchless.
26tpi is still quite a common size, nominated bsb, but it has 55 degree angle whereas true cycle thread is 60, these are 60! On small threads it doesn’t make much difference, they can be interchanged, but thats not my style, I like it right and having the thread angles right makes them fit much nicer.