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Need help wiring NATO plug to Audio XLR cable!

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  • 1 year later...

Which NATO plug UK or US\Nexus\U174U Mil(TP120 commercial plug)







This is the plug that's only used in aviation. The mating

shaft of the plug is 5.23mm




The mating shaft of the plug is 6.35mm

Mil:M642/4-1, NSN:5935-00-192-4760.

You can buy a plug at any electronics store.



U-174/U TP120 (TP-101)


This is a NEXUS plug, not a NATO plug

(sometimes referred to as a US NATO plug)

and it is not compatible with the UK NATO

plug below. Wiring,

Tip(1) Mic low (2) Ear high (3) Mic high (4) Ear low






PLUG 671


This plug will not mate with the Nexus range, the

mating shaft diameter is 0.43 mm bigger. This is a

Mil spec brass plug, NSN:5935-99-946-6652. Wiring,

Tip Mic, Ring 1 Mic, Ring 2 Ear, Ring 3 Ear, (Ring 1

next to tip) Mating Socket 626, NSN:5935-99-949-1940


Be carefull we bought 2 ANR kits, integrated power & audio leads, + ship power units from Headset services Amarillo, And specified UK NATO connectors they were supplied with TP120 plugs, when querying we were told they were the same, on pointing out the discrepancies they appeared to not know & said they could not send correct parts as they could not source. Go figure!!!!

They offered to refund if we returned the goods to The US we are in the UK, & had fitted the wiring & units, this is not feasible so we will have to stand the hit, there were other problems as well.

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  • 8 years later...

I have an application with a desk mike that plugs into a radio transceiver using a UK NATO plug.

I would like to know what the connections should be in this situation

The wires I have are:  mike high, mike low,  PTT  , ground.

My concern is that if the set is on, then the unkeyed PTT line will be at 28 volts and I dont want that to connect to the mike insert when inserting or removing the plug.  I'm thinking the PTT line needs to be on the tip so it is the last contact to be made when inserting and the first to be broken when removing the plug but there could be a proper standard for this application.

Thanks in advance.

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  • 2 months later...

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