Old fashioned cable clamps, 3/4″ x 16tpi, wanted.

[Andrew TinsleyParticipant @andrewtinsley63637]

Looking for 2 or 3 of the above. The thread is standard conduit thread. They were widely used on older electric motors. I need them for a period restoration job.

I have listed them as wanted in the classifieds, but thought I may get better coverage here.

Regards,

Andrew.

 

[Robert Atkinson 2Participant @robertatkinson2]

Could you get away with adaptors and 20mm glands?

3/4″ ET male to 20mm female  is fairly common:

https://www.tlc-direct.co.uk/Products/COAD34M.html

Robert.

[DC31kParticipant @dc31k]

An option could be PG11, machine off the thread, loctite on a sleeve and re-cut to 3/4-16.

https://uk.rs-online.com/web/p/heavy-duty-power-connector-accessories/3136477

https://www.rapidonline.com/harting-09-00-000-5101-han-cable-clamp-pg-11-metal-51-9845

Also available in M20, but the ID might be too small for a conversion (these also seem to be out of stock everywhere):

20mm Male Cable Clamp – Galvanised

[Andrew TinsleyParticipant @andrewtinsley63637]

Thanks both,

I have already investigated your suggestions. However I would much prefer the authentic cable clamps, as this is for a restoration project, which long predated the modern plastic items! It certainly would look odd to my eyes, to see such items in a 1940’s environment!

I have used up my stock of the old fashioned items, so may be forced to use the plastic alternatives, if I cannot find more of the original items. These types of metal clamps in modern form are available from China, but again they look nothing like the old fashioned units.

Thanks for your suggestions,

Andrew.

[rjenkinsgbParticipant @rjenkinsgb]

Are these the general style of clamp you mean? The ones that also have the die cast saddle are very difficult to find, though.

https://www.lowes.com/pl/conduit-conduit-fittings/conduit-fittings/clamp-on-type-service-entrance/4294653948-859813875

 

[Robert Atkinson 2Participant @robertatkinson2]

Note that the North American 3/4″ fittings are 14 TPI not 16.
30 years ago I’d say try you local motor rewinder who may have a box of old fittings. Unfortunatly most small rewinders have gone. Might still be worth a try though.

Robert.

[JasonBModerator @jasonb]

3D metal print a few. Or if anything along teh lines of what DC linked to then not beyond cutting from solid.

[Andrew TinsleyParticipant @andrewtinsley63637]

Thanks R Jenkins,

The clamps you have identified are the ones from China and look nothing like the old fashioned diecast variety that I am after, but thanks for taking the trouble to find them.

Regards,

Andrew.

[Andrew TinsleyParticipant @andrewtinsley63637]

Yes these old fashioned diecast clamps are becoming rare. I had several in my electrical junk box and I am sure other people probably have the odd one knocking about. The problem is how do you find these people? Hence my add in the classified and this topic. They do exist, as one well known contributor to the forum, sent me one FOC a year or two back, before I found the ones in my electrical junk box.

Andrew.

[Andrew Tinsley]

On Andrew Tinsley Said:

Yes these old fashioned diecast clamps are becoming rare.

As you say the modern ones are nothing like the old ones, could you provide a picture of what you seek.

In addition, were there name brand manufacturers of them back in the day?

Have you looked on Grace’s Guide or the Internet Archive for any contemporary literature?

Having a name or names on which to search (e.g. eBay) might produce fruit.

3D printing in metal has been suggested, but perhaps lost wax casting using a 3D printed mould into which you can pour the wax could also work.

[Andrew TinsleyParticipant @andrewtinsley63637]

Hello,

Here are the images of the two types I would like to find. The one on the left is made by Henley and is type 12D The one on the right is by Lewden.

I believe the Henley version is the older of the two and hence preferable!

Andrew.

[duncan webster 1Participant @duncanwebster1]

I have at least one like this, it’s M20 by 1.5mm, but fairly sloppy. I wouldn’t be surprised if it will fit. Yours if you want it, if I have a search I might find another

[Andrew TinsleyParticipant @andrewtinsley63637]

Hello Duncan,

I strongly suspect that it 3/4″ x 16 tpi and not M20 x 1.5mm especially as you say it is a bit of a sloppy fit.. Whichever it is, I would bite your hand off, or rather cross your palm with silver for one if not two of those clamps!

As an aside, you were the “well known contributor” I mentioned earlier, who sent me one of those clamps FOC several years ago! This time I don’t expect a freebie.

Thanks,

Andrew.

[JasonBModerator @jasonb]

You could get them 3D printed for less than the cost of the ones in DC11K’s link. 7No something like this for £62 delivered in aluminium or a few quid more for stainless. Just tap the screw holes yourself, open out the top ones to clearance and separate the clamp bar from the main body.

[duncan webster 1Participant @duncanwebster1]

This is your lucky day, I’ve got 3. Send me your snail mail address by PM and I’ll send them to you. I do not want paying, I probably acquired them from somewhere, I certainly didn’t buy them.

[DC31kParticipant @dc31k]

The item is called a ‘bonding nipple’. One is for flat cable (RHS); the other is for round cable.

Both are available in die cast from Lewden, parts PD435 and PD427 as well as a die cast converter from M20 to 3/4-16 (PD1452A).

The M20 female portion of the adptor could be shortened a little if required and a shortened M20 male loctited into it. Swap out cheese head screws for round head or the other way around to suit your taste.

See this listing, that has a snapshot of Lewden’s (2012) catalogue.

https://www.ebay.co.uk/itm/115791261458

https://storage.electrika.com/flips/5080-lewden-general-11-12/files/assets/common/downloads/Lewden%20General%20Catalogue%2011-12.pdf (page 132 of the pdf).

[Andrew TinsleyParticipant @andrewtinsley63637]

Thanks everyone for your inputs, the forum is certainly the place to find help. All is now sorted, Duncan Webster has found 3 of the Lewden variety in his store of valuables. So I am now well set up complete the task for which I volunteered! Note to self, you really must stop volunteering, you have more than enough unfinished projects of your own!

Again a sincere thanks to everyone who has responded.

Andrew.

[Speedy Builder5Participant @speedybuilder5]

Note to all, a photo at the start of the enquiry would have helped as many of us wouldn’t know a part by description only.

Bob

[Andrew TinsleyParticipant @andrewtinsley63637]

Hello Bob,

Some of us do not have the means to take a digital photograph. I certainly do not!. My photographic kit is 35mm and larger format. I had to ask a friend to do the necessary for me. Something that I would not like to make a habit of. I have better things to spend my money on than a smart phone.

Regards,

Andrew.

[bernard towersParticipant @bernardtowers37738]

you have a pc or something similar can you not use that?

[Andrew TinsleyParticipant @andrewtinsley63637]

My PC does not have a camera, I am somewhat of a luddite in that respect.

Andrew.

[PeteParticipant @pete41194]

Your not alone Andrew. 🙂

[Nicholas FarrParticipant @nicholasfarr14254]

Hi Andrew, you don’t need a smart phone, and there are plenty of compact digital cameras below £60.00 that you can hook-up to your computer and download your photos, and can be bought from the likes of Argos, Amazon, for instance. But of course no one should be pressurising you to put up photos, although it does help people to understand things at times.

Regards Nick.

[Andrew TinsleyParticipant @andrewtinsley63637]

Thanks Nick,

The number of times I need to post photos is miniscule. It really isn’t worth investing £60 in a digital camera for the very limited use I would make of it. Money is tight and I have much better things to spend it on.

Bob is welcome to chastise me for lack of photos, it is his privelege!

Andrew.

[bernard towersParticipant @bernardtowers37738]

old digital cams are cheap in the Oxfam shops

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