DIYbanter - View Single Post - Making an Adaptor from the vintage single wire 5/8" screw on MIC connector to BNC

Fox's Mercantile

On 1/11/19 6:46 PM, wrote:
On Fri, 11 Jan 2019 15:21:54 -0800 (PST), whit3rd
wrote:

On Thursday, January 10, 2019 at 7:24:54 PM UTC-8, Fox's Mercantile wrote:
On 1/10/19 8:59 PM, whit3rd wrote:

Don't you want a UHF BNC adapter? Take a look at images.google.com with
that search string...

Except....A UHF connector is 5/8-24 pitch.
The Amphenol button connector is 3/8-27 pitch.

CORRECTION The Amphenol button connector is 5/8-27 pitch.

Unless you consider cross threading a feature, they are not compatible.

Oh, then the 'easiest' solution I'm aware of is a pogo pin soldered in a BNC
fitting, and a lathe-job threaded tube, 3/8-27 to 38-32, to mate the threads.

I'm not sure I've ever encountered 3/8-27, but I have taps for 3/8-24./ -26. /-32
Lots of people who aren't machinists or who work with lamp fittings
could easily think that a 1/8-27 straight pipe thread is 3/8-27. This
is because 1/8-27 straight pipe thread has a major diameter of .394"
to .390", which is only .019" to .015" over the major diameter of a
3/8 thread. And as sloppy as some threads are made, especially the
threads on lamp fittings, the mistake is even easier to make. I have
had more than one person ask me to either tap holes for 3/8-27 or if I
knew where to buy a tap for that thread because they had no luck
looking in catalogs or online for the elusive 3/8-27 tap.
Eric

--
"I am a river to my people."
Jeff-1.0
WA6FWi
http:foxsmercantile.com