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ZINUS Quick Lock Metal Smart Box Spring, 4 Inch Mattress Foundation, Strong Metal Structure, Easy Assembly, Full, White

4.7 4.7 out of 5 stars 9,426 ratings
Amazon's Choice highlights highly rated, well-priced products available to ship immediately.
Amazon's Choice in Box Springs by Zinus

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Eligible for Return, Refund or Replacement within 30 days of receipt
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Full
4 Inch
Smart Box Spring

Purchase options and add-ons

Size Full
Brand Zinus
Color Hassle & Headache Free - the Quick Lock Metal Smart Box Spring Comes Together With Easy-to-follow Instructions, Fewer Bolts and Absolutely No Headaches; Assembly That’s Intuitive and Packaging That Seems to Defy the Laws of Physics - Now That’s What We Call a New-age Box Spring See more
Item Weight 41.29 Pounds
Age Range (Description) Adult

About this item

  • 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 that’s intuitive and packaging that seems to defy the laws of physics - now that’s 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
  • LOW PROFILE DESIGN - A 4 inch height is perfect for taller mattresses or for those who enjoy their bed lower to the floor
  • THOUGHTFULLY PACKAGED - All parts, tools and instructions are packed into one compact box that ships straight to your door; Quick Snap assembly system makes set-up intuitive and stress-free
  • 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

Customer ratings by feature

Sleep quality
4.8 4.8
Sturdiness
4.7 4.7
Easy to assemble
4.7 4.7
Maneuverability
4.6 4.6

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From the manufacturer

Quick Lock Box Spring
available in 4, 7.5 and 9 inches profiles
Support for Any Mattress
quicklock slats

A New-Age Box Spring

Build It, Stress-Free

Our Quick Snap assembly process is much like it sounds - quick and yes, a snap to set up! Steel slats hold up beautifully to everyday use, and are easily secured to the structure by applying pressure, not screws. And voila! An ultra reliable foundation.

quick assembly icon

Handyman Skills Not Required

Ready in No Time

Simply unbox, assemble the framework and zip on the durable cover for years of unparalleled mattress support. All with just a friend's help and less than an hour of your time. Now that's what we call convenience.

Are any tools required to assemble my box spring?

This box spring is shipped with everything you need to assemble it - all parts, tools and instructions can be found efficiently packed in the shipping box.

Does this box spring require a bed frame?

A basic metal bed frame or platform bed is required to support this box spring. Add your mattress, and you've got the dynamic trio for rock solid support.

What kind of mattress can this box spring support?

Our box springs are designed to do it all! Rest your memory foam, latex or spring mattress on top for smooth snoozing.

What is the distance between slats?

For Twin and Full sizes, spacing is 3 inches. For Queen and King sizes, spacing is 2.9 inches.

Looking for specific info?

Product information

Warranty & Support

Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

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ZINUS

ZINUS Quick Lock Metal Smart Box Spring, 4 Inch Mattress Foundation, Strong Metal Structure, Easy Assembly, Full, White


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Product guides and documents

Product 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.

Customer reviews

4.7 out of 5 stars
4.7 out of 5
9,426 global ratings

Customers say

Customers like the ease of assembly of the box spring. They mention that the parts are labeled with very easy instructions, and the pictorial instructions are clear. They appreciate the quality of the product, stating that it is well-made, sturdy, and reliable. They also appreciate the fit and finish of the bed, mentioning that everything fits snugly in place. Customers are happy with the noise level, saying that it makes no noise. They say that the value of the mattress is well worth the price. Customers also are happy about comfort, and appearance. However, some customers differ on weight.

AI-generated from the text of customer reviews

1,746 customers mention1,665 positive81 negative

Customers find the punching bag easy to put together. They mention that the parts are labeled and the instructions are clear.

"...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...." Read more

"...came with the necessary tool kit and instructions making it easy to put together. Highly recommend this support system...." Read more

"I have bought three of these..Very easy to assemble and appear very sturdy...." Read more

"...It is fairly easy to put together just read the directions and take your time. It took me around 45 mins to put together by myself...." Read more

1,736 customers mention1,624 positive112 negative

Customers are satisfied with the quality of the box spring. They mention that it is well-made, reliable, sturdy, and has given more stability to their large wood bed. The design is thoughtful and there are no issues with it. The box spring serves its purpose and is easy to put together.

"...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..." Read more

"We were so impressed by this support foundation. Very well made with its style of construction and material used made for superior support This..." Read more

"...All the parts were there, it went together very easily, and it serves its purpose. My bed feels better." Read more

"...It took me around 45 mins to put together by myself. This is solid, does NOT squeak, the partitions are 2 inches apart, very stable, durable, and..." Read more

450 customers mention320 positive130 negative

Customers like the fit of the punching bag. They mention that everything is snug in place, and the finish is great. The cross bars went in nice and snug, and locked nicely into place. The foundation was easily placed onto the frame, and this box spring went together perfectly.

"...It fits perfectly on the bed frame and feels like I have a new everything. No creaking...." Read more

"For a ready to assemble unit, it goes together well and is pretty solid once built" Read more

"...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..." Read more

"...It seems that all the problems have been solved. Everything fits together. The cover zipper is gone...." Read more

369 customers mention312 positive57 negative

Customers like the noise of the punching bag. Some say that the box spring is quiet, has no squeaks, and does not make metal-on-metal clanking noises. Some mention that the bed is firm and does no crinkle.

"...Everything fit like a glove. It doesnt make a sound if we get up or toss and turn, and the mattress stays in place...." Read more

"...No noise, squeaks or rattles when on the bed. I have one in guest room, MBR and bought one for my son (along with a new mattress). Highly recommend," Read more

"...This is solid, does NOT squeak, the partitions are 2 inches apart, very stable, durable, and all around it is perfect!!..." Read more

"...It's very sturdy and totally silent. Highly recommend." Read more

331 customers mention303 positive28 negative

Customers appreciate the value of the punching bag. They mention it's sturdy, cheap, and should last as long as the mattress. Customers are also happy with the quality for the price point and say it'll upgrade their experience.

"...Thank you for an excellent product and a price that is very reasonable ……" Read more

"...Good value and cover for it." Read more

"...Happy with quality for the price point." Read more

"...MAKES LITTLE TO no noise even when kids are jumping on it. Great value price everything!" Read more

246 customers mention234 positive12 negative

Customers are satisfied with the comfort of the box spring. They mention that it is super supportive, firm, and stable. The amount of support this box spring adds is amazing, and the mattress feels much more stable and firmer on this foundation than the original box spring, making it more comfortable getting on and off. Customers also say that it makes them sleep well at night.

"...made with its style of construction and material used made for superior support This system came with the necessary tool kit and instructions making..." Read more

"...My bed feels better." Read more

"This was easy to assemble and provides excellent support to my foam mattress. It's very sturdy and totally silent. Highly recommend." Read more

"...It gave me the additional height I needed and added a slight bit of firmness that was more comfortable than my mattress had previously been...." Read more

216 customers mention213 positive3 negative

Customers are satisfied with the appearance of the punching bag. They mention it looks very good, perfect as a design can be, and elegant. The black metal also looks elegant and classy. The cover makes it very nice, and it looks like a true adult bed. Customers also love the snap-on design, and the illustrator did an incredible job.

"...The over for them is very nice and makes the foundation look as good as any foundation...." Read more

"...It is easy to assemble, but does take two people. The outer cover is nice and fits well. It isn't too heavy to move and fits onto the bed correctly...." Read more

"...my husband and it comes with all of the tools and screws u need its cool and easy to assemble, just know its pretty heavy because its metal...." Read more

"...heavy so it’s easy to carry yet it is very sturdy, and the cover makes it very nice so you don’t see the metal framing." Read more

266 customers mention156 positive110 negative

Customers are mixed about the weight of the punching bag. Some mention it's not too heavy to move, and easy to carry. They say the box spring has a good weight to it, but is not impossible to move alone. However, some customers say the boxes are long and heavy.

"...The upper mattress does not move at all, and makes no noise getting on, moving about on it, or getting off of it...." Read more

"...The frame itself is heavy and high quality which makes my lift up bed a lot harder to pick up but I think it's worth it since it saved me time and..." Read more

"...The outer cover is nice and fits well. It isn't too heavy to move and fits onto the bed correctly. We are pleased with this purchase" Read more

"...OMG, it was easy to assemble, sturdy as could be, not overly heavy and at a price much less than any regular one piece wooden box spring...." Read more

Need a sturdy box spring for a Dream Cloud Hybrid Mattress, this is it!
5 Stars
Need a sturdy box spring for a Dream Cloud Hybrid Mattress, this is it!
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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Top reviews from the United States

Reviewed in the United States on June 15, 2023
Size: KingStyle Name: 4 InchDesign: Smart Box SpringVerified Purchase
Customer image
5.0 out of 5 stars Need a sturdy box spring for a Dream Cloud Hybrid Mattress, this is it!
Reviewed in the United States on June 15, 2023
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.
Images in this review
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51 people found this helpful
Report
Reviewed in the United States on February 11, 2024
Size: QueenStyle Name: 4 InchDesign: Smart Box SpringVerified Purchase
Reviewed in the United States on January 22, 2024
Size: KingStyle Name: 9 InchDesign: Smart Box SpringVerified Purchase
2 people found this helpful
Report
Reviewed in the United States on January 24, 2024
Size: KingStyle Name: 4 InchDesign: Smart Box SpringVerified Purchase
Customer image
AJ
5.0 out of 5 stars Omg they sent a ratchet along!
Reviewed in the United States on January 24, 2024
So I have bought and put together enough furniture to hate the allen wrench that is always sent along. Don’t get me wrong, I appreciate that it’s included so if you don’t have one it’s available. But it sucks putting together furniture with one, especially if there are a lot of screws. This base only had like 12 screws in total. This company was kind enough to send along a ratcheting allen wrench! I’d give them 5 stars for that alone! I mean there isn’t much I can say about the base. All the parts were there, it went together very easily, and it serves its purpose. My bed feels better.
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Customer imageCustomer image
Reviewed in the United States on February 4, 2024
Size: QueenStyle Name: 7.5 InchDesign: Smart Box SpringVerified Purchase
Reviewed in the United States on August 27, 2023
Size: KingStyle Name: 4 InchDesign: Smart Box SpringVerified Purchase
Reviewed in the United States on December 29, 2023
Size: QueenStyle Name: 9 InchDesign: Smart Box SpringVerified Purchase
3 people found this helpful
Report
Reviewed in the United States on January 20, 2024
Size: KingStyle Name: 7.5 InchDesign: Smart Box SpringVerified Purchase

Top reviews from other countries

katie Cochrane
5.0 out of 5 stars Boxspring king
Reviewed in Canada on June 15, 2023
Size: KingStyle Name: 7.5 InchDesign: Smart Box SpringVerified Purchase
Customer image
katie Cochrane
5.0 out of 5 stars Boxspring king
Reviewed in Canada on June 15, 2023
I put it together easily, I put the cover on the bed frame and built the boxspring in to it. Every easy to assemble, very sturdy and only about 2.5-3 inches between bars.
Images in this review
Customer image
Customer image
Michael H
5.0 out of 5 stars Solid foundation and easy to assemble - a WOW purchase
Reviewed in Canada on August 5, 2022
Size: QueenStyle Name: 9 InchDesign: Smart Box SpringVerified Purchase
Jasmine
5.0 out of 5 stars Easy to assemble and solid.
Reviewed in Canada on August 19, 2021
Size: KingStyle Name: 4 InchDesign: Smart Box SpringVerified Purchase
Sparkle
5.0 out of 5 stars Easy to assemble and SOLID
Reviewed in Canada on June 15, 2020
Size: QueenStyle Name: 4 InchDesign: Smart Box SpringVerified Purchase
Customer image
Sparkle
5.0 out of 5 stars Easy to assemble and SOLID
Reviewed in Canada on June 15, 2020
I actually bought this box spring because my dog is getting older and has issues jumping up on the bed. I've heard about the stairs for dogs but i thought that a lower box spring might do the job. Was i ever surprised to see it come in a box so narrow. I thought that it would be difficult to put together. It was perhaps one of the most easy things to put together and on top of that, it also included a ratchet to tighten the screws! That ratchet was the most handiest tool to use. I loved it.

I was really surprised, once put together, how solid it was. My bed no longer squeaks, and well, it did not bother me before, but now i notice the no squeaks. I also have wrapped in the cover that came with it. You just slip it in the cover and zip it! So easy!

Not only did it accomplish my goal of having the bed lower for the dog, but it also surprised me with it's solidness and ease of assembly. I did not realize that I would like it so much and now wonder why I did not get one earlier.

A final note which should be mentioned. I have put together many new things lately and they seem to be just thrown together in the box and instructions are not clear. It is like they don't care about you once you buy the product. NOT in this case. I feel like the company went beyond to make sure that you would like their product. Easy to read instructions, a separate ratchet, and everything placed in the box with care. I was impressed. Definitely worth the investment and I'm speaking as someone that did not even know that she needed a new box spring, until she got one!
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15 people found this helpful
Report
Karen Rommel
5.0 out of 5 stars Super Easy To Assemble!
Reviewed in Canada on August 19, 2023
Size: KingStyle Name: 4 InchDesign: Smart Box SpringVerified Purchase