That little bit of Hollow Threaded Stud on a table lamp?

[SPECIAL LOCATION]

One of my daughters broke her bedside table lamp the other day...

Traditional ceramic base with a hole in the top which the hollow threaded stud comes through into the bottom of a switched lamp holder like these

BC Switched Lampholder T2 Rated

Now the problem is its the hollow 1/2 inch threaded stud bit that has actually broken.. (only plastic!!!)

I used to have some of these bits & lock nuts in a box somewhere..

(but buggered if I can find where I put em)

So I need to buy a new 1/2 Inch Hollow threaded stud..

Quick search hasn't found anything yet...

(no doubt Patch will find something before I can say Cup-O-Tea & the Newspaper please!)

Anyone know if it has a "Proper" name or where's the best place to pick some up without paying

 

[steptoe]

Some normal stud and a pillar drill?

Must be somewhere sells them though.

 

[NozSpark]

How's about this website??

Lighting parts and hardware for Lamp Renovation

 

[apprentice87]

Hi, trouble you are going to have is that it is a funny thread. It is [so far as i know] 1/2 BSB Yep not BSP as in pipe threads, but BSB as in british standard brass. This is [so far as i know] 26tpi, same as cycle thread, but a different thread form 55 degree instead of 60.

You are going to be struggling with this one!!

Cycle thread will be near enough i think though.

What sort of length do you need and what diameter hole down the middle??

john..

---------- Post Auto-Merged at 13:49 ---------- Previous post was made at 13:18 ----------

Just had a look and an experiment. I got an old brass lampholder and tried it on a bit of 1/2" brass bar i just threaded 1/2" BSCy and yep, it fits! Soooo, if you are stuck, let me know and i will thread and drill you a bit and post it to you.

john.

 

[Evans Electric]

I have a contact for this stuff somewhere , ..now where the hell........... back later when I've found it.

---------- Post Auto-Merged at 19:10 ---------- Previous post was made at 18:59 ----------

Can't find the details but theres a supplier called "Inlico" (I think thats the spelling)

There is also a place near the Baggies ground

Cords & Cables

Unit Q1

Hawthorn Ind Estate

Middlemore Road

Birmingham

B21 0BH

0121 523 2574

[email protected]

 

[NozSpark]

When I was in one of our local wholesalers I asked about these..

And guess what.....

Wait for it.......

They have both 1" and 2" long 1/2" diameter threaded tube.

If you want some let me know and I'll stick some in the post.

 

[Evans Electric]

Blimey ! Which wholesaler is that , Noz.?

 

[Sidewinder]

apprentice, (et al)

The 55/60 degree thread form thing is the difference between BSW/BSF (i.e UK British) & UNC/UNF/Metric, the British threads are 55 deg, & the metric threads are 60 deg, don't tell the Yanks though coz they think they are imperial!

As far as UNC/BSW the only one you can't get away with is 1/2" as all the other pitches are the same, not so with UNF/BSF though.

Apart from a few specials you can normally fit an inch sized 55/60 together no matter which is the male/female.

NOT for maximum strength applications but for most uses it's OK.

If I can't get BSW I substitute for UNC on most machine applications and get away with it easily.

 

[NozSpark]

Just a local independent....

He's actually got 4 of each!!

 

[apprentice87]

Hi Sidewinder! OMG someone that understands threads!! Yes you are right in what you say.

There are other differences in the thread form apart from angle though, the BSW/BSF are, "round root, round crest" which is why, when you cut one on a lathe, unless you have one of the "new fangled" "full form thread inserts" in other words, you do it the "proper" way! you will need a thread chaser too, to create the round crests. [obviously impossible with a single point tool]

The unc/unf and metric ranges are all "round root flat crest" so you can just cut them with a single point tool easily.

I was always taught that the UNC/UNF threads were "A metric thread form [round root, flat crest] in imperial sizes" which i suppose is true!

What you say about interchangeability is very true, not recommended as you say, but it does work.

I can remember being in tech about 35 years ago having to copy out a long list of this sort of thing off the board. BA, 47 1/2 degree angle, round root round crest, not to mention Acme, buttress, cycle, and knuckle threads. [apparently used on submarine hatches, at least that is what they told us!!]

We had to go home then and write it all out neatly in the form of a chart as our homework!

Ha ha, reading your post made me feel about 17 again!!

I got a cycle thread tap and die set here, Cycle thread is the same as the brass thread as regards pitch, 26TPI, but as i said, the angle differs although they are both "round root round crest" as regards thread form.

Right, i am just off out to the lathe to cut my 2 start left hand acme thread, well, not really, but it sounded good!

What you do when you are not installing electrics then?? You obviously have a lot of knowledge of mechanical engineering.... You secretly related to fred dibnah then!!

john..

 

[Evans Electric]

He is the Welsh vesion of Fred Dibnah M8 :slap

 

[steptoe]

hes a long lost love child........

 

[Sidewinder]

apprentice,

I have a colourful past mate!

Yes I do know mechanical engineering my Honours & Masters Degrees are 1/2 & 1/2!

I also have several other mechanical engineering qualifications as well as the electrical stuff.

I also did an old fashioned apprenticeship!

Makes me feel old now!

Yes I also knew that BA was 47.5 deg & the crest forms, but I thought that would have been wasted!

Also from memory I think you are correct on the forms but I would need to check, it has been quite a few years since I could be bothered to check such things!

 

[Apache]

(no doubt Patch will find something before I can say Cup-O-Tea & the Newspaper please!)Anyone know if it has a "Proper" name or where's the best place to pick some up without paying

 

[apprentice87]

Hi Sidewinder, Do not misunderstand and think i was trying to teach you anything about threads and threading!!!

I could tell from your original post that you know quite enough about that sort of thing already!!

I was just jabbering on about engineering stuff in general in the way that i am rather prone to, as it is rare to meet someone like yourself that knows what they are on about where these sort of things are concerned!!

You must be of a "certain age" then!!!!! [bit like me!!]

Keep up the good work, not many people with your sort of ability left....

john..

 

[SPECIAL LOCATION]

Thank you all very much for your offers of assistance....

much appreciated...

but even better news....

I had another big search around my various boxes of odds-n-sods..

and I found a pukka piece..,

Pictures to follow later....

I knew I had one somewhere, but just couldn't put my finger on it till I found it today!!!

About 3 or 4 years a go I did a refurb job on two brass chandelier type fittings with 4 lamps per fitting,

I bought a load of odds & ends of threaded tube, shaft, stud....

and there were table lamp bits among the spares I purchased..

so all is good at 'SL' towers again.....

I will add some photos of the repair later.

:Salute :worship:Salute:x

 

[steptoe]

ah, so happy daughter=happy wifey=happy Spec Loc,

so the beers are on him, Guinness

che che noi.

 

[batty]

Don't be such a tight sod and buy her a new one.

 

[SPECIAL LOCATION]

Right as promised...

Pictures.. (bit hazy off me phone!)

this is that packet of odds-n-sods that I knew I had somewhere but couldn't find..

The Black bit in the middle of the packet is what I needed.

It has a 1/2" hollow threaded stud and a 17mm mounded nut head on one end.

It will screw into the threaded end of a switched lamp holder...

But obviously you do stick the lamp base between the stud and the lamp holder!!!! ROTFWL

Anyway I still don't actually know what the proper name for that threaded molded hollow nut end stud is called????

Or where I bought that packet from..

It must the 3 or 4 years old from when I did a refurb on a pair of brass chandelier fittings...

(thread new wires put new lamp holders on..)

I just know I bought a selection of threads lamp holders & odd's n sods!

Then stuffed in a box safe so I wouldn't lose them!!!!!! :^O

:C