It is mainly found on electric bikes and scooters in order to recharge batteries.

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I would need an extension cord. It is hard to find without the name.

  • \$\begingroup\$ Try google image search not by words but by your own picture as request ; it answers many many quit similar connectors, So this one looks like N3F & XLR familly. \$\endgroup\$
    – user201301
    Oct 17, 2021 at 15:47
  • 1
    \$\begingroup\$ @francoisP: it doesn't look like an XLR to me. \$\endgroup\$ Oct 17, 2021 at 15:56
  • \$\begingroup\$ @francoisP That's definitely not XLR. It's not N3F either, since that has a rectangular cutout in the shell; it's not plain circular like this. Besides, N3F seems to be used almost exclusively for camera shutter remotes, and I wouldn't expect it to carry much power at all. It's quite a lot smaller than this one, too. \$\endgroup\$
    – Hearth
    Oct 17, 2021 at 16:00
  • \$\begingroup\$ GX16 by the look of it. Bit smaller than an XLR, rated up to 10A. \$\endgroup\$
    – user16324
    Oct 17, 2021 at 17:55

4 Answers 4


It is a GX connector, commonly known as an "aviation connector". It is also called "HS" by Hirose and WB by Weipu.

My connector identification utility lists 20 possible matches:

  • Industry standard - GX12
  • Industry standard - GX12 rev
  • Industry standard - GX16
  • Industry standard - GX16 rev
  • Industry standard - GX20
  • Industry standard - GX20 rev
  • Industry standard - GX25
  • Industry standard - GX25 rev
  • Industry standard - GX30
  • Industry standard - GX30 rev
  • Industry standard - GX35
  • Industry standard - GX35 rev
  • Industry standard - GX40
  • Industry standard - GX40 rev
  • Industry standard - GX48
  • Industry standard - GX48 rev
  • Hirose - HS12
  • Hirose - HS16
  • Hirose - HS21
  • Hirose - HS25

If you click on one of the items, it gives you sourcing information.

If you give us the diameter of the black part (in mm, please) I can narrow it down for you.

  • 1
    \$\begingroup\$ That connector shape and size is common to all electric bikes chargers where the batterry is rated for 48V or higher. \$\endgroup\$ Oct 19, 2021 at 1:59
  • \$\begingroup\$ My aim is to add an external battery to the bike so I would need an edged extension cord. \$\endgroup\$ Oct 20, 2021 at 11:48
  • \$\begingroup\$ Wat do you mean by "edged"? \$\endgroup\$ Oct 20, 2021 at 15:21

I would need an extension cord. It is hard to find without the name.

You would have to purchase a 'GX16 3P Male/Female Head Aviation Socket Connector Electrical Cable - 2m'.

enter image description here

You may also make your own using a 'GX16 3P Male / Female' pair.

You would need to confirm that the current carrying capacity of the cable is adequate for your requirement.

  • \$\begingroup\$ I would need an edged extension cord. The aim is to add an external battery. \$\endgroup\$ Oct 19, 2021 at 2:02
  • \$\begingroup\$ What's an edged extension cord? \$\endgroup\$
    – vu2nan
    Oct 19, 2021 at 10:44
  • \$\begingroup\$ An extension cord where one of it s connectors is edged. \$\endgroup\$ Oct 20, 2021 at 11:47
  • \$\begingroup\$ @user2284570, it's been 2 days and you still haven't answered my question. What is the diameter of the black cylinder? I need it in order co complete the identification. \$\endgroup\$ Oct 20, 2021 at 15:22
  • \$\begingroup\$ @DavideAndrea I don’t have the tooling to measure it. It’s just on an electric bike to the size is implied. \$\endgroup\$ Oct 21, 2021 at 13:35

It looks like the type fitted to the flying lead from the DC supply of my Yamaha mixing desk i.e. one of these: -

enter image description here

It's quite commonly used as far as I know so maybe buy a DC supply from these people or from these people and cut the connector off.

Here's also the user manual for the mixer - maybe there are more details in there about it.

Wow, my first hit and I found it here searching for "3 pin connector with knurled lock nut": -

enter image description here

  • \$\begingroup\$ I would need an edged extension cord. The aim is to add an external battery. \$\endgroup\$ Oct 19, 2021 at 2:02

finally, I found plugs alone on may vendors sites the name of the plug is

3 PIN 16mm or 18mm GX16-3 Screw.

  • \$\begingroup\$ They aren t edged. \$\endgroup\$ Oct 19, 2021 at 11:31

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