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I'm sorting an old collection of electronic components, some of which I don't know what they are used for, like this one:

top side upside down

This component is about 7 mm wide. Does anyone recognize this? Thanks in advance!

EDIT: with scale

enter image description here

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    \$\begingroup\$ do a photo of the top and include a mm scale level with the top. \$\endgroup\$ Commented Mar 1, 2019 at 20:40
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    \$\begingroup\$ Looks like one of these coming up googling "4 pin circular connector". \$\endgroup\$
    – Eugene Sh.
    Commented Mar 1, 2019 at 20:48
  • \$\begingroup\$ @Jasen good point, I have added a new photo. \$\endgroup\$
    – Stephen B
    Commented Mar 1, 2019 at 21:28
  • \$\begingroup\$ @EugeneSh. I could not find a relevant photo when Googling that search term. Maybe it's a regional issue. Can you provide more information on what you have found? \$\endgroup\$
    – Stephen B
    Commented Mar 1, 2019 at 21:29
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    \$\begingroup\$ After Googling a little further with the search terms you suggested, I found a very similar match for TO18008D or TO5 transistors. More similar items can be found by googling "transistor socket 4 pin". Thank you all! \$\endgroup\$
    – Stephen B
    Commented Mar 1, 2019 at 22:08

2 Answers 2

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It is most likely a type of 4-pin transistor mount. Similar results can be found by Googling "TO-5 transistor socket".

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Looks like a 4 pin ZIF carrier.

The arms probably flip up, which allows a fragile or flimsy component lead to be inserted.

Then the arms would flip down and the assembly would plug into another connector.

It may be used for transistors, or possibly for sensor wires.

or

It could be the core from a connector.

It clips onto the end of a 4 wire cable, as described above, but the rest of the connector is missing.

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