"BQ340" wrote in message
...
On 7/13/2013 9:39 PM, Terry Coombs wrote:
I'm making a brake line tee for a guy , and I'm having trouble getting an
acceptable fit . The compression nut reads 9.85 mm x 1mm pitch . The tap
I
bought measures 10.10 ... and the nut is way too loose in the threads .
I'm
wondering if this auto parts store tap is oversize ... might be OK for a
bolt thru a bracket or something , but I'm not using it for this job . Is
there a chart somewhere that has size data for taps by fit class ?


Flare fittings should be used for brakes, not compression.

For a brake line its typically a double flare fitting. Also, amazingly
enough if you "over" tighten them they are more likely to leak then if you
under tighten them.