2 Ton Bottle Jack Cylinder Thread Identification

[John5788]

Does anyone know what the thread type is used on the main cylinder for a typical 2 ton bottle jack?



#25 in the picture.

I'm specifically asking for the Pro Lift 2 ton bottle jack if it makes any difference.



I assume they are all manufactured more or less the same. I am asking because I am trying to make a slightly longer (about 1/2" longer) tube for different project and would like to cut threads on the new pipe that match the original cylinder.

 

[brownbagg]

just buy a new one at harbor freight

 

[John5788]

just buy a new one at harbor freight

I'm not looking to repair/replace a bottle jack. I want the cylinder that is inside but slightly longer. Plan is to get a longer pipe and thread it myself.

 

[The Cobbler]

do you have a thread gauge and calipers? maybe you could figure it out. might not even be a standard thread . might need to cut it on a lathe

 

[mikegt4]

Almost all 2T bottle jacks are going to be Chinese and therefore metric. Pretty easy to figure out. Put a metric ruler up against the threads, 1mm pitch will line up with the points of the threads. 4 threads in 5mm=1.25 pitch, 4 threads in 6mm=1.5 pitch etc.

 

[John5788]

If it's a metric thread I can figure it out, I have thread gauge for that. I'll check it later tonight.

I didn't want to start measuring the thread pitch without at least identifying what kind of thread it was, NPT/BSP/JIC/metric/etc..

 

[Walkers]

I can tell you with near certainty that what you are trying to do is going to be very difficult. Mostly because these are Chinese **** made with very little regard to standards. So you count the threads, but the the angle of the dangle is off because the tooling is all hand ground. Works for them, but not for you. You would be better served cutting the piece in half and welding in a piece, or padding up the base the amount you want.
Even better yet, describe what you want to do and see if the GJ guys have an easier or better idea.

 

[metlmunchr]

I'm wondering how a person who can't measure a thread proposes to make a hydraulic cylinder tube from scratch.

 

[laser3kw]

I'm wondering how a person who can't measure a thread proposes to make a hydraulic cylinder tube from scratch.

Nothing saying they can't or have the capability. When designing something, you start with the path of least resistance. I too would ask for specs before reverse engineer something. With the whole wide world at your finger tips, it is foolish not to ask first, research second, then reverse engineer.

 

[73project]

I thought most jacking rods were all acme threads.

 

[The Cobbler]

^^ He's talking the cylinder, part #25 in the picture