BELLA BAYS 4pcs 39.37 inch 1000mm 4040 T Slot Aluminum Extrusion Profile European Standard Anodized Black Extruded Linear Rail Guide Frame for 3D Printer Laser Engraving Machine CNC Workbench DIY

I work in aerospace and we use a ton of 8020 to build structures, so I know the stuff is extremely versatile and robust. I'd never heard of this company and was curious how it would compare, and to be honest, if you put a piece of this side-by-side with 8020 I don't think I could tell you the difference. I own one other piece with a single channel, so it's nice to have the second as you can use it for adding brackets and such, or just get a little more clamping force. I'll need to buy a lot more before I can build much with it, but so far I am very pleased with this product. Price wise it seems pretty similar to its competitor and I'm not sure if this company offers the same level of customization they do, but I will absolutely be picking up more of this!

Previously I bought my aluminum extrusions from the other "A" store because of the price, but didn't like waiting 2 or 3 weeks.Then I found this extrusion on Amazon for nearly the same price in the sizes and dimensions I needed for a project.All four pieces in my order were equal length within 1mm. That's fine for me.

Used to roof mount solar array on boat. Works well with available 4040 hardware. Withstood hurricane force winds with 200 watt panels mounted on it.

The product came in exactly as ordered, and was bubble wrapped and boxed tightly and effectively to protect the product.

Good quality extruded aluminum,used to mount solar on van roof. Worked perfectly

4040 is such useful stuff because it’s so easy to use it for bolting together pretty much anything you can imagine. I’ve assembled a bunch of things from 4040 that came as precut and complete kits that you unbox and build. This 400mm extrusion is exactly what I expected to receive and it is compatible with my other 4040 extrusions and fittings.

At only $17, this is a bargain. It comes to about a buck an inch. I'm a retired electronics technician with an electronics bench to test all things electronic. However, I also have a woodshop in the basement. I'm currently building a beefy router table, one that will soak up vibrations and perform more accurate work than a handheld router or even a flimsy weekend warrior router table can. For this I need a solid carrier to mount a sturdy fence. This will work perfectly. This one is only around 15 inches, so I'll be ordering longer piece, and then I'll embed it into the 2" thick table. This will enable me to attach/mount all kinds of extras when routing a piece, not the least of which are "fingers" holding the wood to the fence.I'm sure there are hundreds of other uses for something like this. Building a very sturdy cage or platform comes to mind. I'm only using one of it's slides, but because of how sturdy and rigid this is, it serves as a perfect platform for that.

Slot depth is much larger than it should be measuring at 15.45mm. 8020 dot net has them at 14.32 mm.Therefore:1. The manufacturer is using less aluminum given the larger depth2. The structure is less rigid3. Hardware like the t-nut with a ball spring is loose and dangles in the t-slot channel.