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What tool is this ? unusual nut socket Answered

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Any ideas on where this tool would be used ? it tightens a splined nut which is keyed with one spline being wider than the others, only identifying mark is the letter "E" stamped on the end, could possibly be anti theft if it's recessed.

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liquidhandwash (author)2017-05-03
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Wired_Mist (author)2017-04-28

It's a "7 spine socket"

I've seen them used for locking lug nuts, but that looks more like a bolt then a lug nut.

I'd second most everyone below that is was most likely used for some sort of machinery purposes (like a lathe or some type of industrial machinery that needs to be constantly maintained)

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Kiteman (author)2017-04-28

I have a funny feeling that the nut is not part of the tool, but just that; a nut.

That makes the other part just the right spanner for tightening or loosening that nut, possibly in a recess, and, somewhere, somebody is wondering why they can't fasten their machinery cabinet...

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Yonatan24 (author)2017-04-28

It looks familiar to me. Perhaps it's a key that was used to tighten a lathe chuck? Or the chuck of a milling machine?

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Downunder35m (author)2017-04-25

I only know similar tools for security purposes.
Something that is not supposed to be removed by unauthorised people.
Not 100$ sure if the handle is just for hand use and to get real force you use a longer bar but it does not strike me for being able to supply massive torque.
My best guess here, despite the nut not being a left hand threat is old motorbike or scooter.
Here the clutch and flywheel with the magnets often use really weird nuts so the user can't manipulte whats behind it.
The nut having a slope towards the thread makes me think that way even more as this design allows for massive binding forces between nut and surface around the shaft/thread.

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seandogue (author)2017-04-25

Probably some old "security" key, or possibly a specialty tool for manually rotating a specific spline shaft

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iceng (author)2017-04-25

Never saw such a tool.. That insert is actually a capture machined nut (one of many) because of the inside thread and the second crossbar hole suggest the tool is used for work in tight spaces..

But then, as they say, anything is possible under the sun. ..

By the evident tool condition (very good pictures) it has lain in disuse for some time...

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