Originally Posted by
clubman
Just don't assume that the front hub matches. Many Raleigh bikes were sold with 24 tpi parts as they used up inventory from all the the Birmingham companies they absorbed in 1960. SA rear hubs weren't sold in pairs with the fronts and weren't always specified as such on many bikes.
I have a well marked jar of Raleigh 26 tpi nuts, a jar of of 24 tpi nuts as well as metric nuts from France, Germany and elsewhere. I use these to determine thread pitches Don't get me started on Whitworth anomalies.
I'm sure it's 26, because it's finer than 24 and nearly indistinguishable from m8 x 1.0
Thread pitch is very close to 1mm
There are 26 threads in an inch if you count carefully. Parallax is not your friend here.
I'm also certain it's 5/16 after seeing other Phillips hubs and parts available. That's said, there's nothing preventing use of an adjusting cone on the drive side. I could mark it to avoid confusion when installing the wheel.