In article ,
"WW" wrote:

"Nate Nagel" wrote in message
...
Was helping cousin hang a pendant type light fixture over the weekend.
Fixture came with solid downrod that screwed together with those nipples
that are used all over the place in lighting. I thought to myself, "self,
if I had a tap for that thread I could make the rod any length she wanted,
and not be limited to the foot-long increments that come with the
fixture." Well, she was happy with no downrod at all in the location it
was going (hung from bulkhead over kitchen sink) but it got me thinking,
what the heck *is* that thread? Google suggests it is a "straight pipe
thread" but what size? Does anyone make sets of those taps for a
reasonable price? Even McMaster-Carr only sells them individually (for
over $20 apiece!)

nate

--
replace "roosters" with "cox" to reply.
http://members.cox.net/njnagel

Nate... I do a lot of desk lamp building and repair. The size is 1/8 X 27
thread per inch. Ace hardware will have both taps and dies. 1/8 x 27 NPT.
(national pipe thread. WW

NPT = National Pipe Taper
NPS = National Pipe Straight

I can neither confirm nor deny that the thread in question is 1/8-27,
but I'm sure you'll agree it's not tapered.