Mainstays 5" King High Profile Easy Assembly Smart Metal Box Spring
Mainstays 5" King High Profile Easy Assembly Smart Metal Box Spring
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Mainstays

Mainstays 5" King High Profile Easy Assembly Smart Metal Box Spring

4.5 stars out of 17263 reviews
(4.5)|
17.2K ratings
Mainstays 5" King High Profile Easy Assembly Smart Metal Box SpringMainstays 5 King High Profile Easy Assembly Smart Metal Box SpringMainstays 5 Twin High Profile Easy Assembly Smart Metal Box SpringMainstays 5 Queen Easy Assembly Smart Metal Box Spring Mattress FoundationMainstays 5 Twin XL High Profile Easy Assembly Smart Metal Box Spring
Bed Size:King

Key item features

  • Easy Setup: Sets up easily in seconds with no tools required.
  • Innovative Design: Folds up for convenient storage and transport when not in use.
  • Ultra-Sturdy Support: Provides strong support for any innerspring, memory foam, or combination mattress.
  • Durable Construction: Made with a powder-coated steel frame for long-lasting use.
  • Polyester Cover: Features a 100% polyester jacquard cover to prevent mattress shifting.
  • Size Options: Available in Twin, Twin XL, Full, Queen, King, and California King sizes.
  • Weight Capacity: Supports up to 600 lbs. for Twin and Twin XL, and up to 1200 lbs. for Full, Queen, King, and California King.
  • Dimensions: King dimensions: 79" x 75" x 5"H - 44.58 lbs.; Shipping dimensions: 78.5" x 11.2" x 6.1" - 50.42 lbs.
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Current price is $119.00
Price when purchased online
  • Free shipping
  • Free 90-day returns
Pro Furniture Assembly

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Columbus, 43215
Arrives by Mon, Mar 9
Sold and shipped by Walmart.com
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About this item

Product details

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Customer ratings & reviews

4.5 out of 5 stars
stars17.2K ratings8,086 reviews
How item rating is calculated
  1. 5 stars80% (13.7K)
  2. 4 stars8% (1,456)
  3. 3 stars3% (503)
  4. 2 stars2% (329)
  5. 1 star7% (1,250)

Reviews summary

Pros
  • : Quick and straightforward process requiring no tools.
  • : Made with robust materials and a solid build.
  • : Offers great value at this cost.
Neutral
  • : Can be snug, but also inconsistent across users.
  • : Can be sturdy, but may also be prone to warping or bending.
  • : Can be snug, but also prone to sizing issues.
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Showing 1-3 of 8,086 reviews

Jul 17, 2025
Angelina
Item details
Bed size: King
5 out of 5 stars review

Verified Purchase

Highly recommend 👌

Im on day one of having this and can already feel a big difference in support for this King 100 lb mattress our frame only has wood slats and wasnt enough plus this gave us the perfect height we wanted for our bed. The assembly was RIDICULOUSLY easy, no screws, no tools needed GREAT, took me literally 10/15 mins to put together. Was going to spend $150 for a 4 inch one on Amazon but happy i took this chance on Mainstay brand. Metal feels sturdy, the cover was easy to slip on.

Helpful?78f4cf10-4508-11f0-b3a2-1fa7e18da776554302228
Feb 15, 2026
Niki
Item details
Bed size: Queen
5 out of 5 stars review

Verified Purchase

Easy!

This was so easy to assemble. It looks intimidating when you first unbox it but it's nothing more than just snapping parts together. No tools needed! I ordered a king size and assembled this in less than 10 mins. The cover is easy just unzip all the way and tuck in box spring then re-zip. It's very sturdy not squeaking or noises and is supporting my hybrid mattress nicely

Helpful?78f4cf10-4508-11f0-b3a2-1fa7e18da776554302228
Jan 29, 2026
Rob
Item details
Bed size: King
5 out of 5 stars review

Verified Purchase

Sturdy and Easy to Assemble

The box spring was surprisingly easy to assemble by one person. Most of the interior structure is preassembled and merely needs to be unfolded. The cover was very easy to zip up over the assembled frame. Once assembled, the item is very sturdy. It fit into our antique bed frame perfectly, without the need for any bed slats.

Helpful?78f4cf10-4508-11f0-b3a2-1fa7e18da776554302228