OrangeA Linear Rail 2PCS SBR16-2000mm, 2xLinear Guide Rails and 4X Square Type Carriage Bearing Blocks,CNC Rail Kit

PURCHASED THESE FOR A SLAB FLATTENING TABLE I MADE. SEEM TO WORK WELL AND ARE OF GOOD QUALITY.

I recently bought a stereo microscope head and needed a stand for it. The best stands are double arm boom stands, which use two linear rails. I have a 3D printer, so I figured, why not just build one? Looking at McMaster-Carr, linear rails and pillow blocks are EXPENSIVE. I looked elsewhere online, and they still weren't anywhere near what I wanted to pay. So then, of course, I checked Amazon and found these. I probably could have gotten away with the 16mm rails for my application, but I decided on the 20mm x 1m.First of all, they're super heavy. I guess that should be expected. They have a nice coating of oil on them, which seems to get on everything like anti-seize does - nothing a little brake cleaner can't take care of. The rails are straight and have a nice polish, and they measure 20mm +0.1/-0.2. The ends aren't chamfered, which would have been preferable, but that's an easy fix. The pillow blocks seem well made, with recirculating ball type bearings in them. Putting the two together, the blocks slide nicely on the rails, though they're a bit loud. The dust seals on the blocks seem to be well-fitted and there's no discernible play in the bearings.I need to cut these rails down, and I did so using an angle grinder with a cutoff wheel. I then polished and chamfered the ends with a 120 grit flap disc. Cutting took a couple of minutes per cut. You could probably do it with a hacksaw but it'll take you all afternoon. Out of curiosity, I tried drilling into a piece of the rail and I was able to drill without too much problem, so the rails aren't too terribly hard.Overall, these are a great choice if you need a set of linear rails, pillow blocks, and mounting blocks. I'll be posting my build to Hackaday and thingivese, and I'll be recommending these rails to anyone looking to build their own microscope stand.

Really good quality, not for.precision application

So the rails in general are great. Good quality, sliders are fine. The only downside for me was the weight. They weigh a lot and that is why I returned them.

Great rails. They are strong and straight. I used them to build a router sled and I couldn't be happier. They slide very easily and provide great support for my router. I get a nice smooth surface every time. As long as you don't push down too hard, you don't have to worry about the bar bending. Highly recommend.The only downside is it doesn't tell you the tapped hole size so you need to bring the slide pieces with you to the hardware store when you figure out how you're using them so you can get the correct size.

vevor did it again great product at a great price. great service

They worked perfectly, Easy to install they came earlier than expected, but yeah very satisfied. I installed the 40 inch rails w/bearing blocks that I bought through Amazon weeks earlier with my router attached to them,so my router system is completer and works smoothly very happy ty

Quality item for making a router sled.