Zinus 7.5 Inch Quick Lock Smart Box Spring / Mattress Foundation / Strong Steel Structure / Easy Assembly, Queen, White
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Availability:
Unavailable
Size: Queen
Style: 7.5 Inch
Pattern Name: Smart Box Spring
Features
- Steel Interior Frame With Steel Slats and a Poly Jacquard Cover
- HASSLE & HEADACHE FREE - The Quick Lock Metal Smart Box Spring comes together with easy-to-follow instructions, fewer bolts and absolutely no headaches; assembly thats intuitive and packaging that seems to defy the laws of physics - now thats what we call a new-age box spring
- DURABLY ENGINEERED - A durable steel frame is used to construct the interior framework of this foundation; twin size supports a maximum weight capacity of 350 lbs, while all other sizes can support up to 700 lbs
- THOUGHTFULLY PACKAGED - All parts, tools and instructions are packed into one compact box that ships straight to your door
- ASSEMBLY THATS A SNAP - Quick Snap assembly system means that this box spring comes together quicker and with fewer bolts
- Worry-free 5 year limited warranty included; box spring only, a bed frame or platform bed is required to support this foundation and is sold separately
Description
We like to think of the Quick Lock Metal Smart Box Spring as the 2.0 version of your traditional mattress foundation. Made sturdier than ever by its substantial steel frame and with its game-changing assembly method, we’ve developed a better way to deliver great sleep to your door. Created with closely spaced slats to accompany your latex, memory foam or spring mattress, this durable box spring comes in three different thicknesses so your bed can be as short or as tall as you like it. The Smart Box Spring features our fool- proof Quick Lock assembly system, meaning you spend less time screwing in bolts, and you get to be pleasantly surprised by how simply and quickly it comes together. You may even pat yourself on the back once you’re done (in fact, we encourage that). We’re so sure of this foundation (along with hundreds of happy customers) that it’s backed by a 5 year worry-free warranty, so you can sleep confidently for years to come.
Product Dimensions: 79 x 59.5 x 7.5 inches
Item Weight: 50.5 pounds
Manufacturer: Zinus
Item model number: OLB-QLBS-75Q
Fabric Type: Steel Interior Frame With Steel Slats and a Poly Jacquard Cover
Warranty Description: Worry-free 5 year limited warranty included.
Included Components: Foundation, Steel Slat, Cover
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To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Similar Products
Top Amazon Reviews
Size: King
Style: 4 Inch
Pattern Name: Smart Box Spring
We recently purchased a Dream Cloud Premier Hybrid Mattress two weeks ago to replace the mattress we had had on our king size bed for the last 10 years. This new hybrid mattress we bought from the Dream Cloud web site is great, but at a height of 14 inches, it was 5 inches thicker than what we had. After it arrived we decided to keep and use the current double box spring we had been using, which were 9" thick, and metal bed frame with headboard that we already had. But we found with that 5 inches of increased height with our new hybrid mattredd that the top of the bed was now much higher then we liked. We love our new mattress, but with having our mattress 5 inches higher it was a little more effort to get on the bed and our feet didn't touch the floor when we sat on the edge of the bed. We were new to the hybrid mattress requirement of not needing a regular box spring, so we decided to see if we could go lower. I read all the reviews for platform bed frames designed for a hybrid mattress. Many of these reviews, the ones made out of wood, complained about their platform bed frame not holding up, with their wood slats cracking, breaking, and making noise, legs breaking off, etc. We surely didn't want any of that plus we wanted to keep out headboard at the same time. Those reviews helped us decide on trying this metal box spring by Zinus. We selected the 4" thick choice for our king size bed cause we wanted the bed top lower. Let me tell you, we are 100% satisfied with the way it is constructed, the ease of putting it together, and the way our new 14" hybrid mattress fits on it. Everything fit like a glove. It doesnt make a sound if we get up or toss and turn, and the mattress stays in place. Here are a few pictures we took as we put it together from start to finish. Before we put the new 4" metal box spring together, we removed those two 9" box springs we had to make room for the new metal one. It took us about 30-40 minutes to put the metal pieces together but it all went smooth. Everything fit nice and easy. The small rachet wrench that is included was a big help in tighting everything. And it only 16 screw bolts were required to fasten everything. Once finished, this new box spring fit right inside the original metal bed frame we had. The fabric cover went on next and fit over the top like a fitted bed sheet. Next we placed our new 14" mattress on top of everything and were very excited with our it fit the bed now. We actually had more mattress support when we laid on the bed. My husband and I were also now able to sit completely on each side of the bed with our feet on the floor. Having the top surface of the bed 5 inches lower on a metal frame strong enough also to support everything has made all the difference. We couldn't be more satisfied. If you have a king size hybrid mattress and want it lower to get on easier with plenty of support underneath this is the metal smart box spring to get. UPDATE: 7 days later. Both of use are enjoying our new mattress very much, thanks to the 4" metal box frame. No moverment what so ever, solid as a rock. The lower height we now have has made all the difference. One thing I wanted to add if you order the king size box, is the box is heavy. My husband had to use a 2-wheel dolly to move it from the front door, through the house and into the rear bedroom. But once the box is open, all the pieces are marked and easy to connect. 2nd UPDATE: Box spring frame is still doing good. Has been a month since we received this, and we'll still 100% satisfied with our purchase. The upper mattress does not move at all, and makes no noise getting on, moving about on it, or getting off of it. We like it enough that we're going to purchase a similar box spring like this for a twin bed that we have in another room sometime this year.
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Reviewed in the United States on June 15, 2023 by Kindle Customer
Size: King
Style: 4 Inch
Pattern Name: Smart Box Spring
New bedroom set needed better support. Lots of options available at big and small local furniture stores. But relocated to an area that didn't have previous stores. Decided to take a chance on it because it was on sale and the vendor offered a return if not happy with it. (don't think they do for Amazon anymore). The shipping box was unwieldy but everything was very well packaged. It didn't take a lot of time to assemble and was quite easy. Just keep in mind you need mattress sized space to move it or better yet assemble it near or within the boundary of the bed frame. Didn't read any reviews prior to purchase. Just looked for what item met the needs of the new bed. Mainly low profile, solidly constructed and with a decent lifespan. Almost three years so far and no complaints.
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Reviewed in the United States on July 7, 2026 by JMZ
Size: Queen
Style: 4 Inch
Pattern Name: Smart Box Spring
It was easy to put this together, with another person helping. It worked perfectly to place under a novaform memory foam mattress , replacing a traditional box spring, to reduce motion transfer or "jiggle" of the mattress when either bed partner moves. Once assembled it feels solid and is great support for the mattress and allows it to "breathe" as recommended by the manufacturer. it cost more than I would have liked, though in the end is a durable and stable mattress support.
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Reviewed in the United States on July 26, 2026 by DAN
Size: Queen
Style: 4 Inch
Pattern Name: Smart Box Spring
Game changer. I wanted a strong foundation for my brass bed frame. I had a newer queen that was too high this was a great choice. Talk about putting together this was the easiest assemble with clear instructions. They also gave a couple extra screws very useful to have if needed. It has supported the mattress and has been very stable No noise at all. The sizing was appropriate. I did have to have someone help get it to the designated area as it was too heavy for me.
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Reviewed in the United States on May 17, 2026 by pjm
Size: Queen
Style: 9 Inch
Pattern Name: Smart Box Spring
This was seriously a HEAVY long, rectangular box when it arrived (sigh .. it is what it is). NOW let me say this .. this was the EASIEST thing I've assembled in a very long time (it was that quick) First .. upon getting the box, open it up and make sure everything per the instructions is inside. I got the Queen size, so there were 22 slats, all the sides, a mid-bar and another mid-piece to strengthen it. I decided to assemble this on top of an existing mattress because of my previous injuries. READ that drawing .. you can clearly find the LARGE print stickers on the pieces so it is very easy to put the outside frame together and then finger tighten the bolts. After finger tightening, I went ahead and did the final tightening with the included in the box RATCHETING tool .. what a great idea to include this with the box when there's people (like myself) who have arthritis in our hands (it was much more comfortable and I could control it easier for tightening). I then added both the length and width crosspieces, again finger tightening and then ratcheting for final tightening. The SLATS are super easy and snugly fit in the exact spaces they need to be (and are approximately 3" center to center spacing). These I just gently put into the slots down one side, and then on the other side, it was a simple matter to line up accordingly and just do a fist bump into place (no movement -- it's snug and stays). The last to go on is the cover for the piece -- it's easy to follow the included drawing (just remember the zippered flap is on the bottom of the piece .. I put the cover over the top, eased it down the sides). Then tilt the piece on its side, and the cover has enough elasticity to be able to gently stretch and zip as you go. All in all, this is a taller piece (I am taller than average, so am relieved about that). The PIECE itself is NOT set up so you can add a headboard/footboard to it by its design (you must put it on an existing frame). So far, so good. This is in a guest room, so I'm not too sure about durability, but I've had the old wood kind of foundations/box springs that were toast after teenagers and tweens were in the room (or worse yet, movers damaged them in moving the items).
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Reviewed in the United States on March 9, 2019 by An Empty-Nester
Size: King
Style: 4 Inch
Pattern Name: Smart Box Spring
This comes in a box weighing about 60 pounds. You can lug the box, or open it and cart the materials. Might take 4 trips. No big deal. Comes with extremely easy instructions, extra screws, and a small ratchet. No other tools needed. It goes together in about a half hour with one person. I got the king size and it fits fine. Very solid, no wonky give and no squeaks. People who write that it is hard to assemble likely struggle with making coffee. Hand screw the bolts everywhere, stand it on its edge, and tighten everything down. This way there is a little “play” which makes inserting bolts easy. Then lay it down and snap in the cross members. No hammer, no mallet. Just push in place and if needed, use your foot. There are no legs, it simply rests atop the existing wooden bed frame, headboard, sideboard. Fits just fine. I left the existing 1x4 slats and put this on top. The end result is a 4 inch deep frame that has cross members 3 inches apart. Plenty sturdy and very supportive. We replaced two 9 inch box springs and were able to lower the bed height with no loss of comfort. I did not bother with the cover because I simply saw no need for it since the sideboards hide the frame.. But if it is exposed, i suppose it does dress it up a tad, so do as you please. I’m very happy with it. BTW, the mattress is a 14 inch Satava pillow top if you were wondering.
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Reviewed in the United States on May 18, 2025 by JL Price in Florida
Size: Queen
Style: 4 Inch
Pattern Name: Smart Box Spring
The quality of this 4" Zinus foundation is high-quality and much sturdier than I had expected. It's strong, quiet and completely flat (no dips). The setup is quite simple, as well. I highly recommend this product.
Reviewed in the United States on June 30, 2026 by H John
Size: Queen
Style: 4 Inch
Pattern Name: Smart Box Spring
Just assembled it. Worth the money. This replaced the old wooden box spring that creaked with every move and rotation. This is solid and easy to assemble. I bought the 4" under a 8" mattress and it is the perfect height.
Reviewed in the United States on July 18, 2026 by Webshopper