aircraft type steel tubing

[Lawson Cox]

I just saw this term used in a posting on door lock set screws but I am not familiar with that term. I'm looking for a spacer/joiner tube with interior threads for a 3/16 OD rod. My local Ace guy can't help me. I am not sure he even understands me. I am attempting to cut a looooong "throttle rod" with the spring loaded ends and make a shorter adjustable one out of it. I do not know the correct nomenclature for the piece of interior threaded tubing I am looking for. Can anyone help with the nomenclature and source of such an animal? I hope I am clear as to what I am looking for and that someone can help me with a source. I just need a piece about 3" long. Thanks, Lawson

[rufus39]

Lawson , is this in the Ballpark as to what you are looking for ?
Try this link....
https://www.mcmaster.com/threaded-tubes/length~3-16/

[Dan in MI]

Thy this:
https://www.mcmaster.com/internally-threaded-rods/

[PeteVS]

Thread sizes smaller than 1/4" are designated by a numerical size. So, except for Home Depot hardware, there isn't really a "3/16" thread size. That said, #10 threads are very close to being 3/16. For most US thread sizes, there are "coarse" threads and "fine" threads. #10 coarse threads are 24 threads per inch. Fine threads are 32 threads per inch. For each of these size/pitch combinations, there's a recommended "tap drill" size which will result in a good thread when tapped. For a #10-24 tap, using a #25 (.149) tap drill is recommended. If you use a smaller drill, it might be difficult to tap. If you use a slightly larger drill, it will be much easier to tap but the resulting thread might not have the desired strength to prevent being pulled out. Likewise, a #10-32 thread recommends using a #21 (.159) tap drill. Simplifying things, if you're looking for a tubing size to use without having to drill anything, try to find something with a 5/32 diameter. I'm thinking that 3/16 tubing for brake lines is going to be too small and 1/4 brake line tubing would be too big. Maybe you could braze a piece of 3/16 tubing into a length of 1/4", drill that out and tap it.
Sorry for the long winded explanation but....

Just saw Dan's response. Looks like he hit the nail on the head!

[johndee138]

Look for coupling nuts at the hardware store

[woodiewagon46]

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If you are joining threaded rod you can use "threaded rod coupler nut's". Any good hardware store has them and McMaster-Carr also has them.

[Bob C]

Like Pete said your not going to find anything with 3/16" threads. 3/16" is .1875
a #8 screw is .164 and a #10 is .190. The 3/16" might work if it is slightly oversize.


I think this is what you are looking for. https://www.jegs.com/i/JEGS/555/157714/10002/-1

[woodiewagon46]

Lawson, if you google McMaster-Carr 90264A425, It's the same as what Bob C. is showing but smaller in length.

[Lawson Cox]

Hey, "All Y'all". As I have often said, this site is truly awesome, with a whole slew of knowledgeable folk just chomping at the bit to help others with all sorts of questions relating to flathead Fords, even the minutia. Thanks again to all who responded. McMaster Carr completely slipped my mind, and I have gone to them many times for many things. I'm calling them first thing in the morning.

[Jack E/NJ]

Lawson >>>My local Ace guy can't help me. I am not sure he even understands me.>>>


I seem to vaguely recall a fix to similar dilemma not too long ago. Yep. I googled it. And here it is. Fellow said It should be easy enough to cut my NOS 18+ inch rod in two, thread it and use a threaded rod union to connect the two pieces back together.


https://www.fordbarn.com/forum/showthread.php?p=2071848

[Lawson Cox]

Originally Posted by Jack E/NJ

Lawson >>>My local Ace guy can't help me. I am not sure he even understands me.>>>


I seem to vaguely recall a fix to similar dilemma not too long ago. Yep. I googled it. And here it is. Fellow said It should be easy enough to cut my NOS 18+ inch rod in two, thread it and use a threaded rod union to connect the two pieces back together.


https://www.fordbarn.com/forum/showthread.php?p=2071848

Hey Jack E/NJ. Thanks for the refresher course on just how much, and how quickly the aging mind forgets. Maybe I just need to hit the archives to see if I have previously asked a question before asking it, again. ROFLMAO. Lawson

A caveat if I might. My first posting was about how to make an adjustable rod where my current post is about where to obtain it the part. (Does that restore at least a part of my credibility? LOL

[38bill]

There is always this. They are slightly adjustable.

https://www.speedwaymotors.com/Searc...d%20connectors

[GB SISSON]

But didn't Dan get the answer back in post #3? the 10/24 internally threaded rod? Maybe I'm missing something. It happens a lot

[Jack E/NJ]

Unlike internally threaded tubes, internally threaded rods haven't been invented yet. 8^)

[rotorwrench]

In aerospace hardware, a -3 or 3/16" bolt has a 10/32 thread. There are some Heim type spherical rod ends that are actually made with that small a thread and are generally used in engine throttle controls. Most are sizes 1/4-28 or larger but the 10/32 are the smallest ones I've seen.

When folks refer to aircraft steel tubing, they are generally referring to thin wall chrome molly steel structural tubing used to build aircraft tube frame structures for fuselages and engine mounts. Each successively larger size will fit inside the next size up. Wall thickness varies so most ID/OD sizes follow the wall thickness.

[Lawson Cox]

Originally Posted by rotorwrench

In aerospace hardware, a -3 or 3/16" bolt has a 10/32 thread. There are some Heim type spherical rod ends that are actually made with that small a thread and are generally used in engine throttle controls. Most are sizes 1/4-28 or larger but the 10/32 are the smallest ones I've seen.

When folks refer to aircraft steel tubing, they are generally referring to thin wall chrome molly steel structural tubing used to build aircraft tube frame structures for fuselages and engine mounts. Each successively larger size will fit inside the next size up. Wall thickness varies so most ID/OD sizes follow the wall thickness.

Thanks. That's good info to have.

[BoxCar Tom]

don't you want a turnbuckle so that when you turn it one way it gets shorter, turn it the opposite it gets longer?

[Lawson Cox]

Originally Posted by BoxCar Tom

don't you want a turnbuckle so that when you turn it one way it gets shorter, turn it the opposite it gets longer?

Yes. I guess. . I'm just thinking of a threaded tube, OD about 5/16 and tapped for a 10/24 threaded rod. I need it about 3" long. That's about all I can wrap my mind around right now. (Grin)

[GB SISSON]

Originally Posted by Jack E/NJ

Unlike internally threaded tubes, internally threaded rods haven't been invented yet. 8^)

I think McMaster-Carr just invented them, but I get it. They really should have called it a tube.

[Jack E/NJ]

Lowes has just what you want Lawson. For a $1.98. It's an extruded threaded tube that looks like a turnbuckle. They have other sizes too. You can have a long chat with the nice lady on line to try to get whatever you want. 8^)

[Y-Blockhead]

Originally Posted by Lawson Cox

I just saw this term used in a posting on door lock set screws but I am not familiar with that term. I'm looking for a spacer/joiner tube with interior threads for a 3/16 OD rod. My local Ace guy can't help me. I am not sure he even understands me. I am attempting to cut a looooong "throttle rod" with the spring loaded ends and make a shorter adjustable one out of it. I do not know the correct nomenclature for the piece of interior threaded tubing I am looking for. Can anyone help with the nomenclature and source of such an animal? I hope I am clear as to what I am looking for and that someone can help me with a source. I just need a piece about 3" long. Thanks, Lawson

I think this is what you are trying to do? I threaded a piece of S/S tube and the throttle rod to make my throttle rod adjustable on my Model A.

[Lawson Cox]

That's the general idea but my approach is slightly different.

[Lawson Cox]

Originally Posted by 38bill

There is always this. They are slightly adjustable.

https://www.speedwaymotors.com/Searc...d%20connectors

I've got some of those. Not what I want if I can help it.

[woodiewagon46]

McMaster-Carr has threaded rod couplers with left hand threads on one side and right hand on the other, PN 91998A105. They have many sizes also.

[Lawson Cox]

McMaster-Carr has threaded rod couplers with left hand threads on one side and right hand on the other, PN 91998A105. They have many sizes also.


I'm just joining two rods together. I do not need a turnbuckle.

[38bill]

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Originally Posted by Lawson Cox

I've got some of those. Not what I want if I can help it.

No problem, but fyi I have been running one for the last 20 years without any issues.

[frnkeore]

Will you need to thread one or both ends of the rods you want to use?

[rotorwrench]

I've made tools and such with turnbuckle type adjustable elements. It requires the left hand thread tap and die. They are available but not all that inexpensive.

Robinson Helicopter Co likes to use fine thread on one and and course thread on the other but both are right hand thread. This gives a fine or a course adjustment on the rod assembly but it takes a while to adjust one of these set ups to get the exact size a person needs. Quick adjustments are still either 1 full turn or 1/2 a full turn at a time depending on the type of coupling attachment on the end of the rod assembly.

[Lawson Cox]

Originally Posted by frnkeore

Will you need to thread one or both ends of the rods you want to use?

I will need to thread only one end of the rod. I had a very long rod that has the spring loaded ends that slip onto a ball on the carb and accelerator pedal. I cut that in two and I am threading each end and joining them with a tube coupling and lock nuts. Once it is adjusted to the desired length, and tightened, it will need no further adjustment, hence, no need for a turnbuckle set up. Besides, I do not have a left hand die. Thanks

[jimvette59]

About aircraft tubing, it would be seamless tubing. The O/D and I/D would be determined by the male threads that will be threaded inside if it. JMO

[Lawson Cox]

HOLY FECAL MATTER, Batman. Finally I know what I need but apparently even McMaster-Carr doesn't have it. I need a 5/16 OD, round, threaded sleeve, 10-24 internal right hand threads. McM-C have the hex shaped but no round. I only need a piece 3" long. Can I just buy the hex shaped and turn it to a 5/16 round? I know, I am becoming anal.(I am concluding I need to retire to my rocking chair and give up fooling with my old Fords)

[Bob C]

If you have the ability to turn the hex to round (a lathe) then why not
take your 5/16" round and drill and tap it to 10-24.

[Ruth]

Originally Posted by Lawson Cox

I need a 5/16 OD, round, threaded sleeve, 10-24 internal right hand threads.

That sound like exactly what is shown in the pictureby Y-Blockhead in post # 21 or am I missing something?

[Lawson Cox]

Originally Posted by Ruth

That sound like exactly what is shown in the pictureby Y-Blockhead in post # 21 or am I missing something?

Okay. Where do I find one like that. That's what I'm trying to find, or the stuff to make one.

[Jack E/NJ]

Blockhead said >>>I threaded a piece of S/S tube>>>


Well Lawson, if you have a 10-24 tap, then should be able to make one from stainless steel tubing. Or copper tubing. Or steel brakeline tubing. Or cunifer brakeline tubing. Your choice. I think cunifer has a nice luster to it myself. 8^)

[Lawson Cox]

"Well Lawson, if you have a 10-24 tap, then should be able to make one from stainless steel tubing. Or copper tubing. Or steel brakeline tubing. Or cunifer brakeline tubing. Your choice. I think cunifer has a nice luster to it myself. 8^) "

Yes, I do have a 10-24 tap but it is small and short. (That reminds me of other shortcomings. LOL ) I want the sleeve/coupler to be 3" long and I don't think I would be able to thread a sleeve that long with my "short tap".

I certainly appreciate all of y'all trying to help me on this. It is really driving home to me how age has crept up on me and adversely affected my thought processes and DIY skills.

[Jack E/NJ]

Threading the whole length shouldn't be needed Lawson. Just 3/8" or so on each end should do the job.

[Lawson Cox]

Originally Posted by Jack E/NJ

Threading the whole length shouldn't be needed Lawson. Just 3/8" or so on each end should do the job.

Yeah, you're probably right. I'll mozzy down to the shop and see what I can scrounge up that might work. Thanks.