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Flexible Coolant Pipe - 1ft (1/2" - OVERSIZED)

Replacement: None. We are no longer carrying these OVERSIZED coolant pipes in our catalog. You can still find the correct 1/2-20 thread pipes here. This page is for reference only.

These plastic Flexible Coolant Pipes have been primarily used to spray refrigeration or washing fluid for machine tools but, thanks to their articulation, they can be used in a multitude of different ways as well.

Note: These hoses are a bit over-sized. They should have a 1/2-20 thread, but they are a bit too big to fit into a 1/2" hole by hand. You can use a wrench to get them in, it will just be a tight fit. Keep this in mind if using these with the third hand base. Check the drawing below.

Flexible Coolant Pipe - 1ft (1/2" - OVERSIZED) Product Help and Resources

Core Skill: DIY

Whether it's for assembling a kit, hacking an enclosure, or creating your own parts; the DIY skill is all about knowing how to use tools and the techniques associated with them.


Skill Level: Noob - Basic assembly is required. You may need to provide your own basic tools like a screwdriver, hammer or scissors. Power tools or custom parts are not required. Instructions will be included and easy to follow. Sewing may be required, but only with included patterns.
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Looking for answers to technical questions?

We welcome your comments and suggestions below. However, if you are looking for solutions to technical questions please see our Technical Assistance page.

  • I used a 1/2-20 die to "adjust" the threads and now they screw in to the base just as easily as the two that come with the kit. After threading the die on the whole way I turned it over and threaded the pipe in to the back side of the die to fully cut the threads right up next to the hex.

  • The description says it has a nozzle diameter of 5mm. Is that in reference to the hole at the end of the tip?

  • Will you carry the Y adapter? I've been wanting to make one of these for 5 years. I'm going to experiment with using an arm as a fume extractor.

  • That is a good price on these units!

    • Only if it was Loc-Line brand - which I don't think it is. That is about the going rate for the Chinese knock offs.

      BTW, are the threads really 1/2"-20, most of these coolant lines use tapered NPT threads. Could they possibly be 3/8"-18 NPT?

      • I'll have to see how my 6x-for-$13-shipped from China knock-offs perform. If they don't, no huge loss, but I think they'll perform decently. They'll take forever to arrive, but it's 6x for the same price as one on Sparkfun (including shipping).

        The custom metal plate will sell the kit on Sparkfun though. They should brand it and possibly give it an even nicer "station" feel to it that can take something like a Panavise board grip too.

      • as the description states, they are 1/2"-20, pipe thread (NPT). so yeah, they're 1/2". However, if using them for a base, a M14 thread actually fits better (seats all the way down, because of the taper).

        • Yeh, I don't actually care about what the thread was supposed to be vs what is actually is. I just want to know, if I order a m14 tap, will that work?

        • These look like 1/4" NPT (note that's the designation for pipe threads - NPT doesn't usually include TPI). A 1/4" NPT male thread is a little over 1/2" outside diameter and is 18 TPI.

          1/2" NPT male threads are nearly an inch in diameter.

          • A 1/4" NPT fitting is spec'd for 18 TPI, these have 20 TPI. I'm holding a pitch gauge right now. They are 1/2"-20 with a taper. Is it a 1/16" inch taper per inch? I don't know. My guess is that they (China) took a stab at the manufacturing and came out with this.

            I'm referencing this chart.

            • The ones I received are definitely 1/4" NPT. Try a 1/4" fip (female iron pipe) fitting - It is a perfect fit. In fact, I used brass 1/2" mip - 1/4" fip couplers (bushings) to make a base. The 1/2" male end can be screwed directly into a 3/4" hole in hardwood. Nylon bushings are cheaper but harder to find.

              • NPT thread standard calls for 18 threads per inch for a 1/4" pipe. These have 20 threads per inch. I would say it is definitely not a 1/4" NPT, but close enough because the threads are plastic and not metal.

                • I think we may both be mistaken. The threads do not seem to line up well with my 18 or 20 TPI gauges. Checking the manufacturer's web site suggests that they are using the British Standard Pipe system. That would make these fittings BSPT R-1/4, that is a tapered 1/4" pipe fitting with 19 TPI.

            • No idea what you'd call that. 1/2-20 is a standard fine thread, but it shouldn't have a taper (could be for ease of injection molding instead of thread function). Or maybe its just what you said - they swung and missed.

              I think NPT taper is 3/4" per foot?

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