ReliaBot 2PCs 10mm x 500mm (.3937 x 19.67 inches) Case Hardened Chrome Plated Linear Motion Rod Shaft Guide Metric h8 Tolerance
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You might be able to thread this on a lathe, but because these are hardened, I don't think a die would work well.
Selected User Reviews For ReliaBot 2PCs 10mm x 500mm (.3937 x 19.67 inches) Case Hardened Chrome Plated Linear Motion Rod Shaft Guide Metric h8 Tolerance
I didn't check to see if it's exactly 400 mm, but it appears to be fine. It's what I'm using for a dual z axis upgrade on my Ender 5, and it's perfect. It's a little less expensive than Misumi, but it appears to be of comparable quality. I was slightly irritated by the fact that they were sent separately - For two rods, I had to use two enormous boxes, but I suppose it's well packaged.
These are in excellent condition and can be purchased at a lower cost anywhere.
This could be used as an axle for a solar panel that pivots. Set screws on the drive gear could not even dent it, so it appears to be of high quality. To secure the two, I had to grind a flat spot on the shaft.
For ND testing, this was used to fabricate a piece. It's a good product that has stood up to the test of time.
It worked perfectly and was a perfect fit.