On Wed, 05 Aug 2009 20:53:04 -0500, Tim Wescott
wrote:


They may be 55 degrees, but they sure as heck aren't 1/8" OD -- the shaft
measured too close to 3mm to be anything else, and the OD of the threads
was definitely 3mm, too.

The limits on the major diameter of a 5-40 UNC-2A thread are
..1242/.1191 -- within .001 of 3mm.

--
Ned Simmons