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 ?

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Snag