On Mar 23, 6:16*am, Richard J Kinch wrote:
Spehro Pefhany writes:
The standard thread forms are
covered by a part of the SPI- the Plastic Bottle Institute, believe it
or not.

For years I've desperately wanted specifications for these threads. *Where
are they to be found? *Can you bless me with them?

Does this help - it has been a book mark of mine for a while
http://www.kenplas.com/topic/neckfinish/

regards
Tim
South Africa