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What is it?

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Bill Davies 211/10/2017 23:34:59
37 forum posts
6 photos

A friend sent a picture for me to identify. It's like a lathe dog but the wrong way round. The thread is on the vee side.


It has a countersunk hole on the other side. I guess it's some kind of clamp, but I've never seen anything like it.

Neil Wyatt11/10/2017 23:54:38
12250 forum posts
555 photos
64 articles

One of these :


Neil Wyatt11/10/2017 23:56:10
12250 forum posts
555 photos
64 articles

Actually it may be a nut splitter, a hardened wedge fits in the square hole.

"Bill Hancox"12/10/2017 02:19:11
243 forum posts
76 photos

Appears to be a pipe hanger

Simon Williams 312/10/2017 08:12:26
225 forum posts
56 photos

If it were stainless, it would possibly be a clamp off the regulator for a diving bottle. But it looks like its cast or malleable iron. So the tensile strength isn't huge. Still, my bet's on something along those lines

john carruthers12/10/2017 08:31:11
508 forum posts
170 photos


Bill Davies 212/10/2017 09:22:17
37 forum posts
6 photos

I like the nutcracker! and Neil's nut splitter. I had wondered if it was half of an old scaffolding connector, the type to allow for angle between the tube, but it's nothing like the 'modern' split pattern. Bill's hanger and Simon's clamp of a pressurised bottle seem plausible, too.

It looks like a double start thread, if it is, then faster locking would be more important than applied force.

Bill Davies 212/10/2017 09:26:04
37 forum posts
6 photos

I note, too, that the range of travel of the thread looks like the entire space inside the ring. So perhaps not a dedicated item. I discounted a puller due to the radius opposing the thread and the hole, and various other reasons.

JasonB12/10/2017 09:59:23
11895 forum posts
1058 photos

Is the small hole theaded or plain?

Colin Heseltine12/10/2017 16:37:56
145 forum posts
28 photos

As a diver there is no way on this earth I would have that as a clamp on a first stage and I'm certain that is not its function. I would go for a nut cracker. Again it is not strong enough to use as a splitter for metal nuts.


Rik Shaw12/10/2017 17:25:34
1037 forum posts
295 photos

Scarfing clamp for gluing rods together to make gunwales for small boats and fishing net mouths - for instance.


Mike12/10/2017 18:00:15
594 forum posts
5 photos

Another vote for a nutcracker. Google for "screw-type nutcracker" and you will find many variations on this theme. Or build your own with instruction at

Alan Vos12/10/2017 18:54:38
43 forum posts
3 photos

Looks like a multi-start thread, If so, speed of operation was a consideration.

Bill Davies 212/10/2017 19:00:17
37 forum posts
6 photos

I took Mike's advice to Google and found some which similar, although nothing identical. There would appear to be a pad or (on some designs) a handle that makes use of the hole. My friend says he's been told it's a pecan nut cracker. I've never cracked those, so I don't know why it would be specific for this nut.

Many thanks, all.

Tony Dimnick14/10/2017 04:18:53
15 forum posts
Posted by Neil Wyatt on 11/10/2017 23:56:10:

Actually it may be a nut splitter, a hardened wedge fits in the square hole.

I guess so too.

Michael-w14/10/2017 07:12:04
1916 forum posts
49 photos
It looks a bit too big to be a nutcracker to me. You could almost pass a coconut through that opening
not done it yet14/10/2017 07:28:17
1387 forum posts
11 photos

I think it may be a controlled cushing device, such as using a couple plates,with grain between, for preparation of samples for early moisture testers, or for compacting those ground samples into a standard sized pellet for use in the testing instrument. Early machines were far better than the farmer collecting a few grains and biting them between his/teeth as a test for readiness for combine harvesting.

Martin Connelly15/10/2017 09:25:14
590 forum posts
66 photos

Maybe a parallel pin pusher for removing or refitting them without banging a parallel pin punch against the pin.

Martin C

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