StarTechcom 2U Sliding Server Rack Mount Shelf - Adjustable Mounting Depth - Vented - 50lb - Heavy Duty Universal 19” Rack Shelf for Equipment Rack (UNISLDSHF19), Black

I found that putting this in place was hard and really needs two people, then extending the shelf was also difficult and did not really work as expected, I have shorted my rack in order to accomadate this shelf but it should have been able to fit in the rack at half extended width. It is the same make as the rack.It is strong as it is fitted at both ends of the rack and will be more that strong enough to hold my NAS and now that I have shortened the rack the NAS will be able to pulled forward from the rack when I need to get to the back of it.

This review for: StarTech.com 2U Sliding Server Rack Mount Shelf - Adjustable Mounting Depth - Vented - 50lbVery sturdy; very likely can hold more than the claimed 50lb, but have no need for more. Came very well packaged (with mounting hardware).Inverted the mount so I have a drawer (lip up) instead of a shelf. Would have loved to have a 1u equivalent, but wanted something >= 18in deep, well ventilated, with a reasonable range of depth, and at a reasonable price. Various reasons for that including need to find have a laptop + PSU + misc. gear (otherwise not rack-mountable). had a choice of going with combination of shorter depth sliding drawer-shelves and fixed shelves ... which in the end would have used 2U. So decided on trying this. Have not been disappointed, bar a few installation annoyances (see below).Only caveat is that mounting shelf-to-rails can take some patience. As with similar gear, first rule if doing this without a helper (and especially if in a closed rack) is to remove the rails (trivial); mount the rails to the rack (trivial); then slide the shelf into the rails (can be not-so-trivial). Issue is the horizontal tolerances are a bit loose--understandable given potential variations--but mostly that rail-to-rack mounting ears are open-ended (they are not a closed oval shape).Good news is that those open-ended rail ears provide plenty of room to adjust. Bad news is that when trying to adjust the rail ears to align horizontally with the shelf, it can be painful. If you torque down the rails, there is a good chance the shelf will not properly mate (e.g., rails are too widely or narrowly separated, or not quite vertical, to allow you to properly slide in the shelf); it takes only a slight misalignment to make the mating between shelf and rails not work.Unfortunately, If you do not torque down the rails to the rack, there is a good chance they will come loose from the rack while you are trying to mate them... and you are left starting anew. Took me three tries (without a helper) but got it done.All of which is a long-winded way of saying: Startech--use closed rack ear mounts in the future. Would have reduced the time-effort from three to one try: loosely mount rails (with no fear of them falling out); slide in shelf and align with rails; torque down rails-to-rack. Only reason I took off a star.p.s. And if you are wondering why the need for a bit more than 1U... my cable modem is the offender (Arris SB6141)... my micrometer says it is 1.74" high (give-or-take, mounted on its side), which means tolerances are going to be very tight for 1U drawer or may bot be sufficient unless the drawer uses rather thin sheet metal ... which typically means inadequate ventilation or it sags (or both). Still tempted to take a grinder to the cable modem to make it fit; sacrificing 1U for that alone still seems a sin.

I installed this the other day in my net shelter 42u rack. I can see why some are nervous or unhappy about the adjustable depth. In order to get it as deep as a dell rack server, you actually need to take the screws right out and install in a maximum extension manner that seems a bit less sturdy. It's also a tiny bit narrower than standard 19" rack mount stuff, so if you install the rails tight against both front posts the shelf can't slide back into them. Install them a bit inside from the extreme outside on both sets of posts and you are golden.Both things are easily sorted out, however, and once installed it seems more than secure and strong enough for its rated weight.The only other issue I have is that the shelf can lock open (extended) but slides very easily from a closed position. Easy enough that it will actually roll out if your rack is a fair bit off level. Then again, easy to fix. Your rack *should* be level, sooooOverall, it's not incredible but for the money it's fine. You can always pay 2-3x as much for an APC shelf, which will be nicer in every way... Depends on your wallet.

few inches short to fit into my rack

As others have noted, this shelf is not very easy to install. It also will NOT fit into a standard computer rack, which will usually have a depth of 36 inches between the rails (I was about maxing out this shelf with my rack that was just shy of 29 inches between the rails, which seems more normal for a half-height rack).A bigger concern is that this shelf does not 'latch closed'. If your rack is on an even slightly unlevel surface and is 'lower in the front', and you push the shelf in, the shelf will slide out. This is really annoying when doing any kind of work in the rack.With all my complaints, the shelf does slide smoothly once it is installed, and holds several pieces of heavy equipment just fine. I don't think that I would buy another one, though.