Re: anybody have this size tap?

[phile@pwcs.stpaul.gov (Philip J Ethier)]

Chris Denzler writes > 
> I have been poking around, looking for a tap for the holes that the rotoflex
> bolts thread into on my GT6+.  Well, it is 13mm 1.25 pitch and doesn't seem
> to reside on any shelf I have found. 

Bet a nickel it is really 1/2-20 UNF.

13mm = .512   1/2" = 12.7mm
20 threads per inch = 1.27mm    1.25mm = 20.32 threads per inch

Pretty damned close, and 1/2-20 UNF is a very common size on British cars.

I don't recall ever seeing an M13x1.25 thread, but I don't have my
Machinery's handbook here.