Cable gland identification - help needed

[RWD3M]

Hi All,

As part of the clean up and recommissioning of the Deenbigh Pillar drill I acquired a few weeks ago, I'd like to replace the connector on the end of the short length of conduit the runs between a MEM switch box (that appears to be OEM, but may not be) and the motor (a British Thompson-Houston). The gland should be screwed into the motor but the threads on it are quite badly damaged and will no longer screw in.

Before I make matters worse I'd like to source a replacement. I've measured the threaded part and it's major diameter is around 19mm. It looks about 1.5mm thread pitch but of course this is a very old motor and the hole in t6he casing looks pretty original so surely not a metric thread right? Unfortunately my largest metric tap is M18 x 1.5 so I can't check it that way.

Can anyone shed any light on what this gland and its thread might be?

Thanks,

Richard.

 

[awemawson]

It's of a pre-metric vintage so it will either be a UK or USA conduit thread

Metric/Imperial, Imperial/Metric, PG/Metric and Metric/Metric Adaptors at PEW Electrical

www.pewelectrical.com

 

[Blobber]

It will be 3/4 inch conduit thread, cant remember now what the pitch was, you used to be able to get adaptors to go from the 3/4 to 20mm, if you want to tap it out to 20mm I do have a tap if you want to borrow it or if you want origionality I might even have an imperial gland in the bits box

 

[RWD3M]

It's of a pre-metric vintage so it will either be a UK or USA conduit thread

Metric/Imperial, Imperial/Metric, PG/Metric and Metric/Metric Adaptors at PEW Electrical

www.pewelectrical.com

It will be 3/4 inch conduit thread, cant remember now what the pitch was, you used to be able to get adaptors to go from the 3/4 to 20mm, if you want to tap it out to 20mm I do have a tap if you want to borrow it or if you want origionality I might even have an imperial gland in the bits box

Well, I'll be blowed!

Looks like it's a 3/4" x 16 UNF. I never even considered it might have been a UNF thread. I'd considered BSP (a lot of conduit still uses this) or even BSF considering the age.

@Blobber I really appreciate your offer, I'm going to try to find some originals first, though I'll also need a 3/4" UNF tap just to clean out the threads in the motor casing, if you happen to have one of those lying around....

I'm off to do battle with Google now, watch this space!

 

[Gragson]

Hi Richard, I took some brass glands off a motor which from memory were about that size, also have some of that spiral galv conduit (can't remember the proper name) you could have if of use, I'll have a dig tonight if of use.

 

[pawsnizzy]

Hi Richard, I took some brass glands off a motor which from memory were about that size, also have some of that spiral galv conduit (can't remember the proper name) you could have if of use, I'll have a dig tonight if of use.

It's a Henley gland

 

[Gragson]

It's a Henley gland

The spiral galv conduit

 

[pawsnizzy]

The spiral galv conduit

To fit that gland, it will be Henley flex

 

[Blobber]

Ive only got the 20mm tap not the imperial one unfortunately, loads of factories/machines we were working on back in the 80s had imperial so it was easier to tap it out and use the modern fittings

 

[RWD3M]

Talk about every day being a school day!

Right, firstly, Chris, that would be great if you have. I can't find anything on t'interweb, new or used. Let me know what you find.

@pawsnizzy as in Henley Block, who knew?! Not me apparently

@Blobber thanks all the same, I shouldn't thing a tap will be too hard to find, I might even put a quick ad in the 'equipment wanted section

 

[Stueeee]

Well, I'll be blowed!

Looks like it's a 3/4" x 16 UNF. I never even considered it might have been a UNF thread.

It's more likely to be 3/4 X 16 TPI BSCon (British Standard Conduit) AKA 3/4 X 16 WF. All imperial conduit sizes from 3/4 to 1 and 1/4 are 16 TPI.

Although I usually retap stuff to use metric glands etc. I do have pretty well a full set of imperial conduit taps and dies. Let me know if you would like to borrow one.

 

[pawsnizzy]

Talk about every day being a school day!

Right, firstly, Chris, that would be great if you have. I can't find anything on t'interweb, new or used. Let me know what you find.

@pawsnizzy as in Henley Block, who knew?! Not me apparently

@Blobber thanks all the same, I shouldn't thing a tap will be too hard to find, I might even put a quick ad in the 'equipment wanted section

I don't beleive that they are related though (not absolutely sure) Henley flex is very heavily used in Industry, but only seen a Henley block in domestic stuff

 

[RWD3M]

It's more likely to be 3/4 X 16 TPI BSCon (British Standard Conduit) AKA 3/4 X 16 WF. All imperial conduit sizes from 3/4 to 1 and 1/4 are 16 TPI.

Although I usually retap stuff to use metric glands etc. I do have pretty well a full set of imperial conduit taps and dies. Let me know if you would like to borrow one.

Googling BSCon brought up this:

Conduit thread ?

I am restoring a vintage car and have a bit of a problem with a thread I have not come across before. The headlamps are fixed to bars that are screwed into a steel frame that surrounds and supports the radiator. It would appear that the thread is 7/8" x 16 tpi which seems from investigation to...

www.mig-welding.co.uk

This has been some schoolday I can tell you!

If you have the 3/4" tap, and wouldn't mind popping it in a Jiffy bag I'd be most grateful.

 

[Agroshield]

Imperial to metric adaptor here:

Lewden PD1452A 3/4

Buy cheapest online Steel Galvanised Conduit Adaptor 3/42 imperal Male External Thread to 20mm Female metric Internal ECT (electric conduit thread)

www.edwardes.co.uk

¾ Inch x 20mm Adaptor Galvanised (Sold in 1's)

Type AD2

www.cef.co.uk

The first link gives a Lewden part number so other electrical wholesalers will also have it. I think you can find them on eBay and that has worked out cheapest overall for me in the past.

 

[RWD3M]

HI all,

I've had an offer of a tap from @Seadog so all should be good now, Thanks!

@Gragson Chris, if you do have those fittings I'd still be interested.

 

[Gragson]

Hi Richard,that took some finding, convinced I'd binned it all until I got to the last box of cr*p as usual!

You're welcome to any/all of it for postage, the conduit cleans up nice as you can see, the dull stuff is NOS about 3meters unused. the brass ends x 4 should come off with a blow torch as only soldered.
Measures in pics are approx, closest I'm getting on thread is 3/8 whit gauge.

There's a wee switch there if you want it haha.

 

[RWD3M]

Hi Richard,that took some finding, convinced I'd binned it all until I got to the last box of cr*p as usual!

You're welcome to any/all of it for postage, the conduit cleans up nice as you can see, the dull stuff is NOS about 3meters unused. the brass ends x 4 should come off with a blow torch as only soldered.
Measures in pics are approx, closest I'm getting on thread is 3/8 whit gauge.

There's a wee switch there if you want it haha.

View attachment 386100View attachment 386101View attachment 386102View attachment 386103

I'd love to take that conduit off your hands, I'll drop you a PM.