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Old 07-10-2013, 11:58 AM   #1
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Need Help Identifying Metric Nut Type


Hi all,

I teach engineering and in one of my labs we have an old diesel engine test rig with a de Prony brake for measuring torque-speed curves. The rig was built in Italy and all of the parts are metric. The company that made the unit has long since gone.

On the torque arm linkage to the force scale there is a nut missing, identical to the one shown in the photos. The inside thread of the through-hole is M8-1.25. The sleeve portion of the nut centers the nut. The exterior hex is needed to adjust the tension.

The closest thing I could find to this was a T nut, the sleeve part is about right but the wood tines are a no-go.

Can anyone help me find this nut? Please not that I am not looking for ways to jury-rig a replacement as I have already spent a lot of time and effort in that attempt and nothing really works right. I am looking to find *this* part. I don't even know what keywords to use to search for this, so a lead on that would be a huge help.

Thanks!
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Old 07-10-2013, 12:25 PM   #2
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Need Help Identifying Metric Nut Type


Looks like an OEM part to me.
For plan B, I would make one out of a metric threaded rod coupling.
Any machine shop could turn the OD and ID on a lathe.
If it has to be solid just insert a set screw.

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Old 07-10-2013, 04:10 PM   #3
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Need Help Identifying Metric Nut Type


Quote:
Originally Posted by joecaption View Post
Looks like an OEM part to me.
For plan B, I would make one out of a metric threaded rod coupling.
Any machine shop could turn the OD and ID on a lathe.
If it has to be solid just insert a set screw.
Drat, I was hoping it wasn't OEM. My plan B was similar, get a rod coupling and a nut, thread them both onto the same rod, and then tack weld them together. I've fiddled and farted around with other ideas but I really need the coupling and nut parts to move as one piece.
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Old 07-10-2013, 09:02 PM   #4
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Need Help Identifying Metric Nut Type


i could make that exact piece on my lathe. if i can do it, a pro can to.
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Old 07-11-2013, 08:00 AM   #5
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Need Help Identifying Metric Nut Type


Is there a machine shop where you teach? Maybe you can get the shop teacher to make one for you. Might cost you a couple of beers.
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Old 07-11-2013, 02:53 PM   #6
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Need Help Identifying Metric Nut Type


It turns out that I lucked out big time - the lost part actually fell into another part of the apparatus. We were tinkering with that part and it fell out onto the floor.

A very lucky break; the hole it must have fallen through is just barely larger than the part and there was nothing to funnel it in. It was like a 3-point shot in basketball that didn't touch the sides.

We have a machine shop, but they aren't tooled for metric. I'd probably have to buy taps and such for them if we went that way.

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