Could someone please post a definition of all these different types of
thread.
I have searched Google and have come up with some basic, but
confilicting, information.

It would also be a great addition to the FAQ.

All i have come up with;

BSP - British Standard Pipe. Parallel thread.
BSPT - BSP Tapered Thread.

What is the difference between a parallel and tapered thread? How,
looking at a male or female thread, would you determine this?
What part of a fitting, and how, would you need to measure to
determine the thread size.
What size and type of thread do you get on a 15mm compression coupler?
1/2" BSP Parallel Thread? The actual thread does not measure 1/2" but
the internal diameter of the 'pipe' does!

Do parallel male and female threads go together? Or is it parallel to
female only?

When should and should not a fibre washer be used?

PTFE or Sealing Compound?

What is a BS746 thread?



Rich