Hi John,
The thread that hold the pipes in on the brakes and clutch components are
not NPT (national pipe thread). NPT is a tapered thread meant to create
sealing joints.
The clutch and brake component threads are straight threads, because these
joints are compression seals. The nut makes the seal by driving the bubble
flare down into the seat to make a compression seal. The threads do not make
a seal.
Triumph used 2 sizes of threads and compression nuts. The thread on the
clutch master (mine at least) is 7/16" x 24 threads per inch.
Here is a link that may be helpful
http://fmsiinc.com/brake-line-tube-nuts.htm
John Cyg.
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