MadModder
The Breakroom => The Water Cooler => Topic started by: awemawson on January 27, 2014, 10:20:46 AM
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I have an Amphenol circular military style 10 pin plug, the back end of which is 1" x 20 tpi, and want to connect it to 20 mm UK flexible armoured conduit.
Is 1" x 20 tpi a standard American conduit thread by any chance ? If I have to turn up a converter I will but would rather avoid it if possible
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Andrew that is a UNEF thread (unified extra fine) There may be adapters to convert to UNF, fine or UNC, coarse but I have never ran across them. The UNEF thread is common on aircraft and military gear. Perhaps the fine threads are less prone to coming loose due to vibration. A lot of the devices using these threads are also are drilled for safety wire. Belt AND suspenders i suppose.
Joe
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Thanks for the reply 75Plus.
I gave up searching and internally single point threaded a bit of brass this afternoon 1" 20 tpi at one end and 20mm conduit thread at the other.
I hate internal single point threading in blind holes, but it went well. It's all too easy to lose your threading tool on the 'back wall' :bugeye:
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Hi there, Andrew and Joe,
I thought they're UNEF because the die-cast aluminium alloy outlet accessories are thin-walled so as to save weight in avionics applications.
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The UNEF thread is also used on the bolts and nuts used to assemble aircraft.
As a side note, I know that we have several Ham Radio operators on the board and the antenna connectors for co-axial cable are UNEF threaded. I have however ran into some PL 259 connectors that were made with metric threads. They looked the same as 5/8-20 threads but would not thread onto the SO-239 socket.
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SNIP
As a side note, I know that we have several Ham Radio operators on the board and the antenna connectors for co-axial cable are UNEF threaded. I have however ran into some PL 259 connectors that were made with metric threads. They looked the same as 5/8-20 threads but would not thread onto the SO-239 socket.
Hi there, 75Plus,
I've just done a search for 'Amphenol SO239' and the best data sheet I found quotes 5/8" by 24 tpi UNEF.
I wrote 'just' but it was actually an hour ago - I was called to dinner and left this reply un-posted!
In my Amateur Radio days, I often encountered pseudo PL259s and SO 239s of Far Eastern origin. Their threads were 5/8" by 1 mm pitch, their bodies were die-cast from zinc alloy and plated. I think the insulators were recycled washing-up bowls!
Sometimes they would cross-mate with 'proper' PL259s and SO 239s and sometimes they wouldn't!
Fortunately, from dismantling many items from the war surplus market, I had built up a good stock of genuine Amphenol UHF connectors, real brass, silver-plated all over and with insulators of mica-loaded Bakelite.
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For what it's worth, I grew up in the New York town where that Amphenol connector was made. My mother and father retired from that plsnt, and my youngest brother still works there.
I am also retired USAF and installed/repaired many of those connectors on aircraft, including safety wireing them.
Chuck
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I've just done a search for 'Amphenol SO239' and the best data sheet I found quotes 5/8" by 24 tpi UNEF.
Hi Pete I stand corrected. I was trusting a 79 YO memory and I have found that it can be dangerous. :doh: I just went to the shop and looked at the tap and die that I have had in this thread for well over 20 years. 5/8-24 UNEF. One would think the specs would be burned into my brain as the info was laser ed into the tools!!
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This is what the original question was all about:
A/ Amphenol don't make a converter to fix flexible conduit to the rear of these connectors
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B/ Andrew Mawson does :ddb:
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C: Resulting in Adaptaflex conduit fixed securely to Amphenol connector :lol:
Andrew
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Hi there, Andrew,
It looks like you've achieved a good result there.
I apologise for my digression.
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Pete,
no apology needed, the offshoots of some of these threads (intended pun) are often more interesting than the original question :lol: