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Unusual Screw Thread May Be Cycle Thread
By Peter Ravenscroft 

[ Ref. 110411 MMDigest, "Seek Unusual Metric Size Tap & Die"
> Does anyone know of a source for an M4.5 x 0.90 tap and die?

Having gone through all my books, I have come up with the following:
I think it is a cycle thread, 3/16 inch x 28 threads per inch, as
near as I can work it out to.  They are available from Tracy Tools,
http://www.tracytools.com/  They cost around £3 but Tracy Tools have
a minimum order of £10.

http://www.tracytools.com/index.php?route=product/product&path=1_3&product_id=29 

Regards,
Peter Ravenscroft

(Message sent Fri, 15 Apr 2011 08:22:49 -0700 , from time zone -0700.)

Key Words in Subject:  Be, Cycle, May, Screw, Thread, Unusual

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