Search  for anything...
Zinus

Zinus 9 Inch Queen Metal Smart Box Spring with Quick Assembly, Mattress Foundation, Strong Metal Frame, Easy Assembly

  • Based on 4,058 reviews
Condition: New
Checking for the best price...
$139.97 Why this price?
Save $19.03 was $159.00

Buy Now, Pay Later

As low as $23.33 / mo
  • – 6-month term
  • – No impact on credit to apply
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout.

Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Apple Pay, and PayTomorrow. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Selected Option

Free shipping on this product

FREE 30-day refund/replacement

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

Availability: In Stock.
Fulfilled by Amazon
Arrives Monday, Jul 13
Order within 21 hours and 2 minutes
Available payment plans shown during checkout
Protection Plan Protect Your Purchase
Checking for protection plans...

Recently Viewed

Size: Queen


Style: New/upgraded with quick assembly


Features

  • Steel Interior Frame With Poly Jacquard
  • STRONG, DEPENDABLE, AND READY IN NO TIME - As if its ultra-durable steel structure and convenient packaging werent impressive enough, our original Smart BoxSpring has been given a quick-assembly upgrade
  • DURABLY ENGINEERED - Durable steel is used to construct the inside framework of this foundation; Twin/Twin XL sizes support a maximum weight capacity of 350 lbs, while all other sizes can support up to 700 lbs
  • EASIER THAN EVER ASSEMBLY - With fewer bolts and tool-free locking brackets for intuitive setup, assembly takes only minutes to complete
  • VERSATILE FIT - Compatible with all Zinus mattresses and bed frames; please confirm dimensions before using with non-Zinus products
  • WARRANTY INCLUDED - Included a 5-year limited warranty for the box spring only; a bed frame is required to support this foundation and is sold separately

Description

As the backbone for solid mattress support, a box spring that falls short can make or break your night’s sleep. We developed the Smart BoxSpring® with unbeatable durability and rock-solid stability to keep your mattress in shape for years to come. And our latest quick assembly version gives you total confidence when it comes to setup, requiring fewer bolts and ingeniously designed with easy to use, tool-free brackets. With our simple, step-by-step instructions on hand, you’ll have this foundation built and ready to use within minutes. Built with a strong and durable steel frame and a versatile poly jacquard cover that slips right on, the Smart BoxSpring® is the picture of dependability for any mattress. All packed in a compact shipping box with everything included, even our 5-year worry free warranty! Now that’s peace of mind you can sleep on.

Size: Queen


Material: Alloy Steel, Fabric


Product Dimensions: 78.7"L x 59.5"W x 9"H


Style: New/upgraded with quick assembly


Special Feature: Quick Assembly, Durable Metal Frame


Other Special Features of the Product: Quick Assembly, Durable Metal Frame


Included Components: Steel Frame, Cover


Brand Name: Zinus


Manufacturer: Zinus


UPC: 841550325416


Global Trade Identification Number: 16


Manufacturer Warranty Description: Worry-free 5 year limited warranty included.


Manufacturer Part Number: ZU-ABS-9QS


Model Number: ZU-ABS-9QS


Set Name: Queen


Unit Count: 1.0 Count


Item Type Name: Box Spring


Material Type: Alloy Steel, Fabric


Product Care Instructions: Wipe with Damp Cloth


Style Name: New/upgraded with quick assembly


Color: Grey


Finish Types: Unfinished


Furniture Finish: Gray


Form Factor: Rectangular


Shape: Rectangular


Compatible With Mattress Size: Queen


Maximum Weight Recommendation: 700 Pounds


Size: Queen


Item Dimensions L x W x H: 78.7"L x 59.5"W x 9"H


Item Weight: 17.6 Kilograms


Item Dimensions: 78.7 x 59.5 x 9 inches


Item Depth: 59.5 inches


Required Assembly: Yes


Assembly Instructions Description: Included


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Monday, Jul 13

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • Easy 45 Minute Assembly with sticky notes
Size: King Style: New/upgraded with quick assembly
I knew there were going to be a lot of parts, so I decided to be as organized as possible. After opening the box, I marked each group of items with a sticky note to make assembly as easy as possible. It took 45 minutes total to label, assemble, and put the cover on. I especially loved the mini ratchet tool that was included; it made tightening everything much faster and easier than using a standard allen wrench. Everything fit as expected and was easy to move into our rolling adjustment frame. The King mattress fits nicely on the metal box spring and does not slide around at all. It looks great and feels very solid. We are looking forward to having family visit and hope they enjoy the comfort. If you take the time to organize the pieces first and use the provided ratchet, this is a very straightforward and high-quality setup ... show more
Reviewed in the United States on January 5, 2026 by LivingLife
    • Good upgrade over wood
Size: Full Style: New/upgraded with quick assembly
Upgraded an old broken down wood box spring with this metal one from Zinus. Setup was just a few minutes, and done with 1 person. Seems very sturdy, I have a larger full size mattress on top as well, and have not noticed any flexing or noise after months of use. I appreciate the fact it is metal, and will probably last longer than the standard wood box springs. My only complaint would be the top is open, so when you go to tuck in sheets under the mattress, your hand will slip in there, but super small complaint. Still 5 star item for me, because the material is good and the price is right. ... show more
Reviewed in the United States on March 8, 2026 by Shopaholic
    • Excellent!!
Size: California King Style: New/upgraded with quick assembly
I recently purchased the ZINUS 9 Inch Metal Smart Box Spring for my California King mattress, and I couldn't be happier with my decision. Here’s why this product deserves every bit of its five stars: **1. Quick and Easy Assembly:** The term "Quick Assembly" isn't just marketing talk. Within 15 minutes, I had this foundation fully assembled. The instructions were clear, and the design is ingeniously simple. No tools needed, which was a major plus for someone like me who is not particularly handy. **2. Durability and Support:** Made from strong metal, this box spring feels incredibly sturdy. There's no sagging, even with the weight of my mattress and two people sleeping on it. It provides excellent support, ensuring that our mattress maintains its shape and comfort over time. **3. Versatile Use:** It's not just for box spring mattresses; it works perfectly with memory foam, innerspring, and other mattress types. This versatility makes it a great choice regardless of what kind of mattress you have or might purchase in the future. **4. Quiet and Stable:** One of the things I appreciate most is how quiet it is. No creaking or squeaking, which is a common issue with some foundations. It remains stable, even when getting in and out of bed, which adds to the overall sleeping experience. **5. Aesthetically Pleasing:** The design is sleek and modern, adding a touch of elegance to the bedroom. It's not just functional; it looks good too, blending well with various bedroom décors. **Conclusion:** The ZINUS 9 Inch Metal Smart Box Spring is an outstanding investment for anyone looking to enhance their sleeping environment. It combines ease of use, durability, and style in a package that delivers excellent value for money. I recommend this to anyone who wants to upgrade their bed setup without the hassle. A truly smart choice for a smarter sleep! ... show more
Reviewed in the United States on October 9, 2024 by slobobdan
    • Sturdy and Easy to Assemble
Size: King Style: New/upgraded with quick assembly
This box spring is solid and supports our mattress perfectly. Assembly was quick with clear instructions. Great value and quality—highly recommend
Reviewed in the United States on November 3, 2025 by Victoria Standley
    • Well built, do wish the pieces were labeled
Size: King Style: New/upgraded with quick assembly
Easy enough to assemble, but I do wish the pieces would have been labeled with an item number/letter. Seems well built and does it's intended job well.
Reviewed in the United States on June 3, 2026 by Adam Easley
    • Strong, Sturdy, and Easy to Assemble!
Size: Queen Style: New/upgraded with quick assembly
The ZINUS 9 Inch Metal Smart Box Spring has been an excellent addition to our bed setup! I was impressed by how easy the assembly process was—everything came neatly packaged with clear instructions, and I had it put together in under an hour without any hassle. The design is very smart and straightforward, making it much more convenient than traditional box springs. This box spring provides strong, sturdy support for our mattress, and it has noticeably improved the overall comfort of our bed. The metal frame feels very durable and solid, and I love that it doesn’t squeak or shift, even with movement during the night. It’s also lightweight enough to move around if needed, yet still very stable once in place. The 9-inch height is perfect—it gives our bed the lift we wanted without being too tall, and it works great with our existing bed frame. Another big plus is that the cover has a nice, clean look that blends seamlessly with our bedding. Overall, I highly recommend this ZINUS box spring for anyone looking for an affordable, high-quality foundation that’s easy to assemble and provides reliable support. It’s a great value for the price! ... show more
Reviewed in the United States on August 25, 2024 by Amanda Cruz
    • Disappointed: Broken and missing parts!
Size: King Style: New/upgraded with quick assembly
A little disappointed. I ordered this Friday night, and the product was promptly delivered the very next day early evening. Kudos to fast delivery! Yay! It’s 4:05 am and I’ve just built my new king size bed frame and I was in the process unpacking this supposed great box frame for king size mattress. As I am separating the pieces in alphabetical order A-S per the parts listing. I found part C had been built incorrectly where it was missing a push in button connection and missing 3 welds. A little concerning being that it suppose to support a king size bed and 2 bodies on top. With so many positive reviews and with so many purchases, I was expecting a great product. I hope it’s a just a one off situation and I'm the only unlucky one. But I am very disappointed at the fact that I won’t be sleeping on my new bed. Going back to the spot welds, it’s pretty janky at best. I can’t imagine this product lasting but as I said, with the many thousands of reviews and purchases by others, who knows. But I expected more. I’m not a welder so what do I know. Anyways… it’s just upsetting to get this delivered along with a purchase of new bed frame and this item was suppose to be the thing that brought it all together. And now, as I write this review, I’m stuck with parts scattered in my room and not a bed to sleep on. Also, because I ordered this product on the weekend I’m having to wait a couple days before getting this issue is resolved since customer service is not available till Monday. Im not saying I don’t recommend this product but I guess we’ll see how customer service handles the issue and how fast I get my part. I will update with a better review once this matter is resolved and I’m able to actually review the product in better conditions. ... show more
Reviewed in the United States on May 11, 2025 by Alexander Dubin
    • Easy assembly, robust frame, fits bed exactly.
Size: Twin XL Style: New/upgraded with quick assembly
The box springs on our King size bed had begun to creak with even the slightest weight on them. When we investigated, we found a wooden frame nailed together and topped with a thin plywood board - so there was no way to tighten the frame and stop the noises. We decided to buy two of the Easy Assembly Zinus Twin XL box springs, hoping that they would be robust enough for use in a rental unit, and that the assembly would not turn out to be a nightmare. We need not to have worried! I assembled the first of the two in 15 minutes, and my wife and I completed the other in 10. Adding the cloth cover was no problem at all, despite some of the comments we have seen from others. Once complete, the two units fitted neatly and easily onto our bedframe. It remains to be seen how long the product lasts, but from the look of it, I expect we will get a good life out of it. The assembled unit is firm and the bed remains comfortable. I am happy to recommend this product. ... show more
Reviewed in the United States on October 28, 2025 by Ian R

Can't find a product?

Find it on Amazon first, then paste the link below.
Checking for best price...