Amazon Basics Smart Box Spring Bed Base, 9-Inch Height Mattress Foundation, Tool-Free Easy Assembly, Metal Frame, Cal King, 83" x 71" x 9", White
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Availability:
In Stock.
Arrives
Thursday, Oct 1
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Size: California King(83"L x 71" W)
Style: 9-Inch Height
Features
- COMFORT AND SUPPORT BOOST: Enhances mattress comfort and stability
- VERSATILE MATTRESS COMPATIBILITY: Supports all mattress types - spring, memory foam, latex and hybrid
- IMPRESSIVE WEIGHT CAPACITY: Twin size supports 350 lbs; Full, Queen, King & California King sizes hold up to 700 lbs total (350 lbs per person max for all sizes)
- EASILY SETUP: Tool-free, interlocking design assembles in minutes
- ROBUST DUARABLE STEEL CONSTRUCTION: Durable frame with horizontal slats for strong mattress support
- EASY-CLEAN DESIGN: Removable two-piece zip cover for convenient spot cleaning
- Product Dimension: 83"L x 71"W x 9"H (Length x Width x Height)
Description
An Amazon Brand. From the Manufacturer Amazon Basics, this product may originate from [China] or [Vietnam]
UPC: 190517873904
Global Trade Identification Number: 04
Included Components: Screw
Item Type Name: box-springs
Model Number: AMZ-9KDBS-CK2
Manufacturer Part Number: AMZ-9KDBS-CK2VN
Additional Features: Durable
Number of Items: 1
Size: California King(83"L x 71" W)
Item Dimensions: 83 x 71 x 9 inches
Item Weight: 43 pounds
Material Type: Metal
Color: White
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Thursday, Oct 1
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.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Size: Queen(79"L x 59.5"W)
Style: 5-Inch Height
Just what I needed! I didn’t want to pay 250 From the local mattress store for a low profile box spring so I decided to give this a try. A great alternative. Seems sturdy and was very easy to put together. Everything snaps in and it’s so intuitive you don’t really need directions. One of the corners was bent up so it gave us some trouble fitting in one piece but my husband was able to take the back of a hammer and straighten it out, otherwise I would have had to get an exchange. I would recommend.
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Reviewed in the United States on July 15, 2026 by Sarah
Size: King(79"L x 75.5"W)
Style: 7-Inch Height
I purchased a king size! I’ll tell you, this was the best option vs buying two XL twin box springs! The king size fit right into my bed frame with no problem. It was very easy to assemble and feels like it will last for years! My bed feels sturdy and stable.
Reviewed in the United States on September 22, 2026 by CJ
Size: King(79"L x 75.5"W)
Style: 5-Inch Height
I have probably assembled 4 or 5 of these box springs in the past and this one was, by far, the easiest to assemble. There is one center piece that unfolds into an “I” shape, and then you attach 2 side pieces. Very easy and intuitive and they lock into the other pieces with just slight force to insert. Then you attach the 10 cross pieces in the same manner by just snapping them into the outer frame. Once the frame is built, you secure it with 4 screws, one in each corner. Then it’s time to put on the fabric cover which fully encases the box spring frame. Wrestling that onto a king frame and then getting it zipped all the way around was the most challenging part of this assembly. I’m sure it would have been easier with 2 people and if I build another king frame, I’ll unzip the cover and build the frame on top of it as I think that would make this go more smoothly. The box spring feels sturdy and this 5” elevation was perfect to raise my mattress to a comfortable level. I’d absolutely purchase this box spring again.
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Reviewed in the United States on July 28, 2026 by Gigi Carol
Size: Full(74"L x 53"W)
Style: 5-Inch Height
Made of pretty sturdy metal so I think it will work well long term. Was easy to asssemble. I am 59 and was able to put it together myself. I took away one star because the cover does NOT fit very well. My husband had to help me try to stretch it over the frame and the zipper def gave way on one corner. Also, as other noted, it is slightly small. It does not matter as it rests on the bed slats just fine. But, I would have preferred the cover to fit and the size to be just a smidge bigger. But, for the price, it is good and sturdy and that is what matters.
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Reviewed in the United States on June 7, 2026 by Laura214
Size: Queen(79"L x 59.5"W)
Style: 9-Inch Height
This is an interesting box spring; it is not like a regular one that I have seen before. Most come like you see them complete and in the final shape and dimensions, but this one comes apart in a rectangular box about 5 ft high. and approx 9X9 around. You open the box and pull out the internal frame. Most of it is folded up and condensed into a smaller package, there are also bars that will be used to assemble and a cover. You basically open up the main part, add the ends and connect them. No tools are needed. after the outer frame is done there are 4 hand screws for the corners. then you just pop in the bars and it is done in the shape of a box frame. Then you open the cover and place it on the frame like making a bed with a fitted sheet. Lift it up and zip the bottom closed like a bag around the frame. then move into place. It is very sturdy after completion and lightweight. It spanned the frame well and held the queen bed mattress. I would recommend this frame for any size. Is light, strong and easy to use and move.
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Reviewed in the United States on June 28, 2026 by bonesdug
Size: King(79"L x 75.5"W)
Style: 9-Inch Height
long story short, i ordered a mattress and needed a new mattress foundation at the very last minute. i've only had this foundation for a day but i'm very happy so far. mainly because it was very easy to set up & the price was affordable (most importantly). so far it seems to be a solid foundation for my hybrid mattress. i'm very happy amazon was able to deliver me this foundation in about 16 to 18 hours with prime shipping.
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Reviewed in the United States on August 27, 2026 by Stef
Size: Full(74"L x 53"W)
Style: 7-Inch Height
Surprisingly terrific! It does go together almost as easily as seen in the video. Took me a few minutes longer. Perfectly fit on the metal slats across the bed-frame rails. It would also fit if you just had the standard 'L' shape rails. The cover is a nice touch. The only deficit I would mention is that this isn't something you might stand on. You could remedy that by adding a 1/4" piece of plywood under the cover, then it would be perfect.
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Reviewed in the United States on August 20, 2026 by D. A. Palmer
Size: Queen(79"L x 59.5"W)
Style: 7-Inch Height
2 small girls share this bed,. 1 is 120 lbs, the other is 100lbs. We purchased a new mattress and this box support 4 months ago for the existing queen frame in their room. we also were replacing the traditional spring mattress with a hybrid so we changed support style to steel slat box to give firmer coverage to the mattress design as recommended by the mattress mfr. If you look at the 3rd photo in the ad, where the steel frame is being assembled by a hand inserting 1 of the rods, you can catch an inward curve of the side of the outer rails both upper and lower edge. This true on mine as well and ended up becoming the 1st issue. the corners measured fine and went to the proper measurement for our queen base, and sit perfectly square on the bed frame, but the middle on 1 side rolls inward, narrowest was a full centimeter narrower than the corners. This got worse over time and eventually let the box slip off the frame when it began to flex the 2nd or 3rd month we had it in use (after the 30 day return had ended). I eventually remeasured, and yes it had lost several more millimeters from flexing. So I ended up bending the frame of the bed on the side to give additional support. That helped for a couple of months. yesterday, 1 corner of the bed dropped 4 inches or so from the corner to the middle of the bed, the other 3 stayed at height. one of the girls was sitting on that corner putting on her boots and it just suddenly DROPPED she said. I flipped up the mattress and removed the box cover. The upper and lower rails of the frame are pre-made with support ribs every foot or so to give it strength and maintain rigidity. 3 of the bars on the collapsed corner had broken their spot welds, and the cause of this was the premade corner joint metal had flexed and broken and you can see the weld was poor so the corner was weak and eventually gave way. This is not due to excess weight, or kids playing bounce games on the bed. It was used by 2 slender teenage sisters with a total weight of 220 lbs, the frame is rated at over 600. The only reason this happened is the welds could not withstand the on and off application of weight and flexed till they broke. since the corner holds the angle and shape integrity, once it broke the supports ribs then had to absorb the now moving rail spacing and eventually their welds cracked. Steel that is rated over 600lbs needs to be durable enough to hold 220 lbs forever, not measured to not collapse with 600 for 10 seconds and then claim "Hold 600 lbs!". Less than 225 lbs over 4 months bent it more which should not happen even if it started slightly curved, it bent more over time because the weak metal flexed stressing the weld joints till they physically cracked likely 1 at a time. It simply isnt a sturdy or high quality piece. It was curved when it arrived. I addressed that by making the frame cirve to make sure it didnt have a less supported rail on 1 side. The 2 months later the welds cracked on 1 corner. I dont even want to warranty it after seeing how it failed. , I expect the same issues will repeat. I assembled it myself, and noticed the slight curve even when I put it together. but the bed frame still had a grip on the box enough it looked like it wasnt perfect but should manage. I liked the high star rating which is why I bought it. Thousands of purchases. However I am a mechanic by trade, with a welding certification and 30 years experience. I do not want this frame again. It has inherent weaknesses in its construction quality that wont affect it for everyone when new, but will make it fail earlier than needed even if you get a better one than the defective one I apparently got. You get what you pay for. There is a reason this box support is 100 dollars cheaper than many of its competitors.
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Reviewed in the United States on October 8, 2023 by Kelly M. Garvey