Zinus 5 Inch Metal Smart Box Spring Queen
- Size: Queen
- Compatible With Mattress Size: Queen
- Maximum Weight Recommendation: 700 pounds
- Form Factor: Rectangular
Last refreshed Sep 9, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A straightforward steel frame queen box spring with tool-free assembly, useful as a foundation under an existing bed frame rather than a full bed system.
As an Amazon Associate I earn from qualifying purchases. ProductDome earns a commission when you buy through links on this page.
ASIN: B09XMB39J1Category: Box Springs
Sizes Available
Styles Available
Need a different one? Pick on Amazon →
Overview
A 5 inch metal box spring foundation sized for queen mattresses, built around a steel frame with a fabric cover and tool-free locking brackets for quick assembly. It supports a mattress on top of an existing bed frame or platform bed, which is sold separately.
This is a foundation, not a full bed: Zinus is explicit that a bed frame or platform bed is required underneath it, and it exists only to support a mattress at standard box spring height. The main change from earlier Smart BoxSpring versions is fewer bolts and tool-free brackets, aimed at cutting assembly time rather than adding features. Weight capacity varies by size: twin and twin XL are rated to 350 lbs, while queen and larger sizes are rated to 700 lbs.
- 5 inch metal box spring, queen size
- Steel interior frame, fabric outer cover
- Tool-free locking brackets for quick setup
- 5 year limited warranty
Who it's for
Fits anyone who already owns a queen bed frame or platform base and needs a low cost foundation to bring a mattress up to standard height. Not a standalone bed solution; a frame underneath and a mattress on top are both needed separately.
Pros and cons
- Tool-free brackets speed up assembly
- Fabric cover gives a finished look under a mattress
- 700 lb capacity on queen and larger sizes
- Needs a separate bed frame or platform
Performance notes
The steel interior frame is rated to 700 lbs for queen and larger sizes, versus 350 lbs for twin and twin XL, so the weight ceiling is worth checking against the mattress and sleeper weight combined. Assembly relies on tool-free locking brackets rather than the bolt-heavy designs older box springs used, which is the main change in this version. It ships as a single compact box rather than the bulkier packaging typical of steel foundations.
Specifications
| Brand | Zinus |
|---|---|
| Dimensions & fit | |
| Size | Queen |
| Compatible With Mattress Size | Queen |
| Maximum Weight Recommendation | 700 pounds |
| Item Weight | 36.8 pounds |
| Item Depth | 5 inches |
| Item Dimensions | 78.7 × 59.5 × 5 inches |
| Item Dimensions L x W x H | 78.7 × 59.5 × 5 inches |
| Construction & materials | |
| Material Type | Fabric, Steel |
| Color | Grey |
| Finish Types | Steel |
| Furniture Finish | Alloy Steel |
| Included components | |
| Number of Packs | 1 |
| Unit Count | 1 |
| Included Components | Cover, Slat, Steel Frame |
| Warranty & support | |
| Manufacturer Warranty Description | 5 years |
| Other details | |
| Form Factor | Rectangular |
| Shape | Rectangular |
| Number of Items | 1 |
| Style Name | New/upgraded With Quick Assembly |
| Item Type Name | Box Spring |
| Set Name | Queen, 5 Inch |
| Product Care Instructions | Wipe with Dry Cloth |
| Other Special Features of the Product | Durable |
Closest rivals on specs
EMODA 5 Inch Metal Box Spring with Cover Queen- Item Weight 36.8 vs 33 pounds (+12%)
- Maximum Weight Recommendation 700 vs 1999.99 pounds (-65%)
SHLAND 5 Inch Metal Box Spring with Cover King- Maximum Weight Recommendation 700 vs 3000 pounds (-77%)
SHOANED BS504 5 Inch Low Profile Box Spring Queen- Maximum Weight Recommendation 700 vs 3000 pounds (-77%)
Frequently asked questions
Does the Zinus Smart Box Spring include a bed frame?
No, it is the foundation only; a bed frame or platform bed is required underneath and sold separately.
What weight can the queen size Zinus box spring hold?
Zinus rates queen and larger sizes at up to 700 lbs; twin and twin XL are rated lower, at 350 lbs.
How long does assembly take?
Zinus built this version with fewer bolts and tool-free locking brackets specifically to cut assembly time versus its earlier box springs.