StarTech.com 1U 19 inch Server Rack Rails - 24-36 inch Adjustable Depth - Universal 4 Post Rack Mount Rails - Network Equipment/Server/UPS Mounting Rail Kit HPE ProLiant Dell PowerEdge (UNIRAILS1UB)

Holds my 4U home server without issue, feel strong and stable. I do have a couple nitpicks but nothing that's a deal breaker for me. Assembly was easy, since they're really just extend then fit to server rack and attach (use your own mounting hardware though). I could not get the screws in the middle of the rails tightened down, as the instructions indicate, to fix the rails length though. Don't know if they were assembled wrong at the factory, or the hardware is bad, or what but it's ultimately not a big deal since they're affixed to the front and rear of the rack and can't move independently. The one thing that I do need to figure out though is some way to hold the server onto the rails, they're very smooth and it slides surprisingly easily forward and rear when doing simple stuff (like plugging or unplugging a cable). Granted a 30" server probably isn't just going to slide entirely off without warning, but finding some sort of grip tape or something to apply to the rails would give some peace of mind most likely.

Bottom line: If you have a rack, and you have rack mount-able servers, but you built them yourself or you have mixed-brands servers and don't want to deal with the $$$ OEM rails, you need these rails to mount your mixalottastic gear in the rack. I have several racks at home. Full size, half height, etc. The gear I put in those racks changes every few months. Switches and patch panels are easy. All 1U or 1U. Servers on the other hand are not. Rails for a Dell 2U server are not the same as HP 2U rails, nor SuperMicro 2U rails and so on. If you've ever sold your used gear, you know that the OEM-specific server rails you paid $100 for, aren't worth half that on the used market. And that stinks. A lot of that gear I buy used or build it myself. The gear never comes with rack rails and even if the rails are available, they cost 2x-3x what these rails do and possibly doesn't even fit in your not-36U-or-more-deep-home rack. These rails are the answer. They are built from heavy-gauge steel. They even come with cage nuts and screws. They may seem expensive, but after you put your first set of these into your rack and cram your home-built, 4U GPU/NAS/AI server box thing that weighs 99 pounds into the rack and there's no drama, you'll wonder why you didn't buy them sooner. Highly recommended.

I used this to mount a QNAP ES2486DC 2U into a 19" x 30" rack. My first attempt, I couldn't get this to fit. I thought it was in the 2U direction, but it was actually the width (19") direction. What I ended up doing was loosening all the screws on all four posts JUST enough that the bracket could freely move close to the post if pushed on with a little bit of force. Even with this configuration my server got stuck on the place of the rails where it doubles up, and I had to reach into the side of the rack and pull on the rails a little bit to get it past that point (The rails actually bend relatively easily this way in a 30" rack). Once I got it past that point, I was good-to-go and could push it all in. After the server was almost all the way in, I went around and tightened all of the screws on the rails, forcing the rail to be more perpendicular with one hand while I tightened the screw with the other hand. It works like a champ. The server I put in weighed at least 100lbs. I'll be putting in some 150lb APC UPSes next, and I expect them to not be an issue. These rails are extremely sturdy.

Long enough to comfortabley fit one of the larger/longer Dell PowerEdge servers with some room to spare, and durable enough to handle a heavy server and two PowerVaults stacked on top with disks. I placed around 200lbs of equipment on this shelf and has it in that configuration for months, occasionally moving and shifting the weight as I worked on things. I've tried some other universal rails, but these definitely felt the most solid out of the few brands I've used.

Bought these twice because they’re just that good. Solid, adjustable, and make mounting servers way less of a headache. Honestly, it’s nice when something this simple actually works exactly like it should.

If you’re struggling to find the "impossible to find" official rails for your Rosewill RSV-L4000, buy these StarTech.com 1U Universal Rails immediately. They act as a sturdy shelf for the server to sit on, making rack mounting a breeze. The adjustable depth (24-36 inches) means they fit almost any 4-post rack, and the build quality is far superior to cheap generic options. It turned a two-person lifting job into a simple slide-in installation.

Works for my needs, but be mindful some servers have little nubs that don’t allow them to sit flush on rails like this - didn’t work well with a power edge r730xd

have a super deep rack, most after-market rails don't work and are super flimsy when fully extended. This thing worked perfectly, fully extended, and super sturdy. Great Design. buying 4 more.