Re: Coarse vs Fine Thread ?

Posted by Pharmall on July 03, 2005 at 23:49:47 from (68.9.106.167):

In Reply to: Coarse vs Fine Thread ? posted by Got a Question for you ! on July 03, 2005 at 19:37:34:

And, of course, ;^) there are coarse, fine, and extra-fine
standard thread sizes in the Unified Thread Series. This is the
standard that was first agreed to by the UK, US, and Canada.
The flywheel nut on a Briggs & Stratton engine is an extra-fine
thread (guess how I found that out!).

The only thing the others haven't mentioned is that coarse
threads are used for softer or more brittle materials (bronze,
brass, aluminum, cast magnesium, cast iron, plastic). Coarse
threads are more resistant to stripping, and are still useful when
some corrosion or slight damage to the threads is present.

There are lots of other specialty thread systems. The farther
back you go in time, things become less standard. A machinist
with a good lathe and some experience can cut just about any
thread they like, and some did, just out of spite. A lot of things
got standardized in WW II.

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