| The Breakroom > The Water Cooler |
| 1" x 20 tpi conduit thread ???? |
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| awemawson:
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 |
| 75Plus:
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 |
| awemawson:
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: |
| Pete W.:
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. |
| 75Plus:
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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