Older 5/16" axle hub thread question

[Jonny69]

Struggling to find the answer to this. I'm missing the front nuts on one of my hubs. It's an older 5/16" axle - but what is this thread? Is it BSF, BSW (Whitworth) or UNF? I don't think it's UNF because none of the UNC or UNF ones in my box will thread on.

 

[Jonny69]

Gah, it's not a proprietary thread for old bikes is it? 5/16" x 26tpi with 60 degree cut threads.

 

[keithglos]

5/16 x 26 TPI, standard cycle thread, also used in brazed on fork lamp bracket bosses, and many seat lug, head clip, and handlebar stem clamp bolts.

Keith

 

[PerB]

Re:

And officially the cycle treads is BSC or British Standard Cycle.

 

[Jonny69]

Definitely not got any nuts in the stash that fit

So I've splashed out on some wingnuts instead