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Old 12-25-2018, 05:56 PM   #1
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Building a Lamp (Threaded Rod IPS Question)


Hello,

I am building a steampunk style wall sconce and I need to connect a small section of threaded hollow rod (1/8" IPS) to a reducer bushing (1/2" x ___). I am leaving the previous dimension blank because I don't know what to get. The threaded hollow rod has threads 1/8" IPS and a 3/8" OD. Do I get the reducer bushing that is 1/2" x 1/8" OR 1/2" x 3/8"? In these fixtures, this is the transition from the piping to the electrical components.

Here is an example of a similar fixture:

https://www.etsy.com/listing/2623876...elated-7&frs=1

Thanks.
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Old 12-25-2018, 07:24 PM   #2
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Re: Building a Lamp (Threaded Rod IPS Question)


What do you need the 1/8" for. I have built these and used only 1/2" Iron Pipe and reducers and flange. Just curious.
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Old 12-25-2018, 08:36 PM   #3
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Re: Building a Lamp (Threaded Rod IPS Question)


You need 1/8 ips to 1/2 ips.
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Old 12-25-2018, 08:42 PM   #4
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Re: Building a Lamp (Threaded Rod IPS Question)


Oops, forgot about the yoke. Yes, but I believe it is 1/4" in the yoke. 1/8" may be too small to pass zip cord through.
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Old 12-25-2018, 08:44 PM   #5
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Re: Building a Lamp (Threaded Rod IPS Question)


IPS threads are not compatible with NPT iron pipe threads. IPS threads are straight threads while NPT are tapered threads. You need a bushing to convert 1/2" NPT(the iron pipe) to 3/8" IPS threads.
You might be able to use a 1/2" NPT to 1/8" NPT bushing and secure the 1/8" IPS pipe to the bushing with IPS nuts to the bushing. 1/8" NPT has an O.D. of .405 inches.

Last edited by brric; 12-25-2018 at 09:03 PM.
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Old 12-25-2018, 08:57 PM   #6
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Re: Building a Lamp (Threaded Rod IPS Question)


Quote:
Originally Posted by brric View Post
IPS threads are not compatible with NPT iron pipe threads. IPS threads are straight threads while NPT are tapered threads. You need a bushing to convert 1/2" NPT(the iron pipe) to 3/8" IPS threads.
Since it's doesn't need to hold fluids and not structural, it might be just fine. I think the threads are close enough to mate, but won't seal very well. My memory could be wrong though.

Cheers!
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Old 12-26-2018, 12:28 AM   #7
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Re: Building a Lamp (Threaded Rod IPS Question)


I have attached a close up picture of the result I am seeking. The yellow line represents the 1/8 IPS threaded rod that I know is under the lid. I just don't know what the reducer bushing fitting is. I am fairly certain the socket accepts 1/8 IPS so I know there is a 1/8 IPS rod under there. The rod is screwed into the mystery bushing and the lid is sandwiched between the bushing and the socket.

I just don't know what the specs of the bushing is...

I may just head to the hardware store and take a section of 1/8 IPS rod (male) and see if I can find a pipe reducer bushing and see what NPS female thread will accept it. Does that sound reasonable?
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Old 12-26-2018, 12:40 AM   #8
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Re: Building a Lamp (Threaded Rod IPS Question)


If the black pipe is 1/2"
https://www.universalair.com/1-2-Mal...05-bf12-23.htm
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Old 12-26-2018, 12:44 AM   #9
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Re: Building a Lamp (Threaded Rod IPS Question)


Thanks Neal. Or this?

https://www.supplyhouse.com/Bluefin-...-Black-Bushing

I think the spec which reads "malleable iron" is interesting... Maybe the male IPS threads will mate to the female.

Last edited by jb9; 12-26-2018 at 12:46 AM.
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Old 12-26-2018, 01:57 AM   #10
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Re: Building a Lamp (Threaded Rod IPS Question)


Quote:
Originally Posted by jb9 View Post
Thanks Neal. Or this?

https://www.supplyhouse.com/Bluefin-...-Black-Bushing

I think the spec which reads "malleable iron" is interesting... Maybe the male IPS threads will mate to the female.
That's just another name for black iron.

It'll likely mate, but it won't thread all the way. Probably enough to keep things together.

Cheers!
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Old 12-26-2018, 02:21 AM   #11
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Re: Building a Lamp (Threaded Rod IPS Question)


The thread is the same but the npt thread is tapered, it will work.
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Old 12-26-2018, 04:23 PM   #12
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Re: Building a Lamp (Threaded Rod IPS Question)


I just got back from the hardware store and you guys were right.

The threaded rod does fit into the bushing but it only threads on about 2 revolutions. The taper does start to impede the threading. I also learned from a friend, that a 3/8-27 tap will clean up the threads on the bushing to perhaps allow the threaded rod to get a little more thread engagement.

I didn't actually find the 1/2x1/8 bushing but I did find a 1/8 thread female brass coupler but I am confident that I can get these fittings to mate in a way that will be secure. The globe on the fixture + the socket parts won't be too heavy I hope but I won't resume the assembly until I'm confident the electrical components are securely connected.
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Old 12-26-2018, 04:43 PM   #13
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Re: Building a Lamp (Threaded Rod IPS Question)


Quote:
Originally Posted by jb9 View Post
I just got back from the hardware store and you guys were right.

The threaded rod does fit into the bushing but it only threads on about 2 revolutions. The taper does start to impede the threading. I also learned from a friend, that a 3/8-27 tap will clean up the threads on the bushing to perhaps allow the threaded rod to get a little more thread engagement.

I didn't actually find the 1/2x1/8 bushing but I did find a 1/8 thread female brass coupler but I am confident that I can get these fittings to mate in a way that will be secure. The globe on the fixture + the socket parts won't be too heavy I hope but I won't resume the assembly until I'm confident the electrical components are securely connected.
2 threads will hold a dozen lbs or so.

Cheers!
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Old 12-26-2018, 04:49 PM   #14
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Re: Building a Lamp (Threaded Rod IPS Question)


I have done it and they went in more than that but you could tap them out easy enough. I repaired a chandler with brass fittings,
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Old 12-26-2018, 06:16 PM   #15
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Re: Building a Lamp (Threaded Rod IPS Question)


I have also done it with my steampunk 'rocket fighter' and yes, it works fine but I added a tiny bit of blue locktight just to sure it up a little.
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