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Can anybody identify this connector? The inside diameter is about 5mm and there is a thread around the outside. I need to get the opposite connector to plug it into. enter image description here

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  • \$\begingroup\$ Where does it come from? What is it used for? Some more information might help. \$\endgroup\$ – Undertalk Oct 18 '18 at 12:49
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    \$\begingroup\$ It's an inline barrel connector. There are lots out there, with a plethora of different sizes for the various diameters for both the hole and the pin (if any) which is in the hole. I doubt we can help much more than that. \$\endgroup\$ – Puffafish Oct 18 '18 at 12:49
  • \$\begingroup\$ @puff That and a picture reference would be an answer. \$\endgroup\$ – Passerby Oct 18 '18 at 13:45
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    \$\begingroup\$ When you say "about 5 mm," could that be 6.25 mm? Do you have a 1/4" headphone plug you could try in it? \$\endgroup\$ – Andrew Morton Oct 18 '18 at 14:21
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It's an inline barrel connector. There are lots out there, with a plethora of different sizes for the various diameters for both the hole and the pin (if any) which is in the hole. I doubt we can help much more than that.

There's a wikipedia entry for them, they are that common.

If you need to get something which mates with this one, and you can't find a datasheet or formal description, you options are either to try and measure it accurately, or trial and error with a bunch of similar looking connectors.

Don't forget, the internal pin length and girth vary along with the diameter and length of the main orifice.

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    \$\begingroup\$ Option 3: cut it off and use something else. \$\endgroup\$ – Andrew Morton Oct 18 '18 at 14:19
  • \$\begingroup\$ @AndrewMorton I was thinking of doing that but then how do you differentiate positive and negative. \$\endgroup\$ – user1897830 Oct 19 '18 at 4:21
  • \$\begingroup\$ @user1897830 a continuity test will confirm that. (Usually outer diameter is negative, inner pin is positive, always check though) \$\endgroup\$ – Puffafish Oct 19 '18 at 7:24
  • \$\begingroup\$ @Puffafish I scraped away some of the insulation on one of the wires leading from the connector and did a continuity test between the uninsulated wire and both terminals. I never got a beep on either the inner pin or outer sleeve. What is going on? \$\endgroup\$ – user1897830 Oct 19 '18 at 12:07
  • \$\begingroup\$ @user1897830 If you don't know which is +ve and -ve, having the physically matching plug won't help either. What equipment is it connected to? Can you open the equipment to try to find out the polarity? \$\endgroup\$ – Andrew Morton Oct 20 '18 at 0:20

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