Amazon Basics 9-Inch King Box Spring Bed Base, Metal

Amazon Basics Smart Box Spring Bed Base is a 9-inch king-size metal mattress foundation with a tool-free interlocking assembly design. Its listed dimensions are 79 inches long by 75.5 inches wide, so confirm the fit against your bed frame and mattress before choosing it.

At a glance

The listing describes an interlocking frame intended for tool-free assembly.
Horizontal slats are described as providing mattress support.
The removable two-piece zip cover is intended for spot cleaning.
The stated capacity for this size is up to 700 pounds, with a single-user limit of up to 350 pounds.

Price

$122.58Save 15%

Reference price: ~~$145.00~~

Price checked: Nov 14, 2026

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Often bought together

Amazon Basics Metal Bed Frame, 9-Leg Support Base for Box Spring and Mattress, King-Size, Tool-Free Easy Assembly, 79.6" x 76" x 7", Black

$59.84

Pros and cons

Pros

King dimensions and 9-inch height are clearly specified for planning bed height and fit.
Tool-free interlocking assembly may simplify setup compared with a conventional box spring.
The listing claims compatibility with spring, memory foam, latex and hybrid mattresses.

Technical specifications

11 specifications

Identity
Brand	Amazon
Model	AMZ-9KDBS-K2

Size and construction
Size	King(79"L x 75.5"W)
Form factor	Rectangular
Dimensions listed	79 x 75.5 x 9 inches
Material listed	Metal
Weight listed	42.2 pounds
Maximum weight recommendation	700 pounds

Assembly and features
Assembly	Minimal, tool-free assembly instructions included
Mattress compatibility	Supports all mattress types - spring, memory foam, latex and hybrid
Cover	Removable two-piece zip cover for convenient spot cleaning

What to know before buying

Customer feedback is mixed on fit, stability, height and durability. Some report a mattress sliding or the base collapsing after six months, while others describe it as sturdy and easy to handle. Verify frame fit and consider these varied experiences when deciding.

What’s in the box

Included

Screw

Who is it for?

A good fit for

Buyers seeking a 9-inch king mattress foundation with a metal frame and tool-free assembly.
Those who want a removable cover that can be spot-cleaned.

Less suited to

Buyers who need a confirmed fit with a particular bed frame or mattress, since reported fit and stability experiences vary.
Those who require a single-user capacity above 350 pounds.

Amazon Basics 9-Inch King Box Spring Bed Base, Metal · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.4 / 5 · 38,982 ratings

5 stars75%75%
4 stars12%12%
3 stars5%5%
2 stars2%2%
1 star6%6%

Customer feedback highlights perceived quality, sturdiness and ease of use, including a report that it is easier to handle than a standard box spring. Experiences are mixed on height, fit, stability and durability: some say it gives a suitable bed height and fits together well, while others report being about half an inch too wide, mattress sliding, or collapse after six months. These concerns matter when matching the stated king dimensions to a frame and when weighing long-term support. Aggregate ratings lean positive, but do not explain individual experiences.

Positive themes

Customers describe it as sturdy and easy to use.
Some customers report good quality and say it is easier to handle than a standard box spring.

Mixed feedback

Fit and size feedback varies, including reports that it is about half an inch too wide.
Durability and stability experiences differ, including reports of collapse after six months and mattress sliding.

Frequently asked questions

What are the listed dimensions?

The listing gives 79 x 75.5 x 9 inches. Check those measurements against your frame and mattress, especially because customers report mixed fit experiences.

What mattress types does the listing say it supports?

It claims compatibility with spring, memory foam, latex and hybrid mattresses.

How is it assembled?

The listing describes an interlocking design with minimal, tool-free assembly instructions included.

What weight limit is stated for the king size?

The listing gives a maximum recommendation of 700 pounds overall and a single-user limit of 350 pounds.