Introduction
The Superay 5-inch King Box Spring (Model SUP-MT23) is a heavy-duty metal mattress foundation designed to provide stable and quiet support for your mattress. Its robust construction ensures longevity and compatibility with various mattress types, including innerspring, memory foam, and latex. This manual outlines the steps for easy assembly, proper usage, and essential maintenance to ensure optimal performance and comfort.

Figure 1: Superay 5-inch King Box Spring, displaying both the assembled unit with its fabric cover and the underlying metal frame.
Important Safety Information
- Do not exceed the maximum weight capacity of 3000 pounds.
- Always follow the assembly instructions carefully to ensure the stability and safety of the bed frame.
- Ensure all bolts are tightened securely before use.
- Keep small parts away from children during assembly.
Package Contents
Before beginning assembly, verify that all components are present. The package includes:
- Metal Frame Components
- Fabric Cover
- Installation Manual
- Slats
- Hardware Kit (bolts, nuts, Allen wrench, wrench)
Video 1: An overview of the Superay Box Spring components and initial assembly steps. This video demonstrates the parts included and how they fit together to form the frame.
Setup and Assembly
Assembly of the Superay Box Spring is designed to be straightforward and can typically be completed in under 20 minutes. All necessary parts, tools, and instructions are included in one compact box. Follow these steps carefully:
Step 1: Unpack and Identify Parts
Lay out all components on a clean, flat surface. Refer to the included installation manual to identify each part (labeled A, B, C, etc.) and the hardware (bolts, nuts, wrenches).

Figure 2: Detailed diagram of all box spring components and hardware, as typically found in the packaging.
Step 2: Assemble the Main Frame
Connect the main frame pieces according to the diagrams in the manual. Ensure that all "UP" labels on the frame pieces are facing upwards. Insert bolts through the designated holes and secure them with nuts. Do not fully tighten bolts until all pieces are in place.
Video 2: A step-by-step demonstration of the box spring frame assembly process, highlighting how to connect the metal components.
Step 3: Install Slats
Once the main frame is assembled, insert the metal slats into the U-shaped grooves on the frame. Press down firmly to ensure they are securely seated. The dense spacing of the 13 metal slats provides optimal mattress support and prevents sagging.

Figure 3: Detail of the box spring frame, illustrating the round corner design for safety and the U-shaped grooves where the slats are inserted.
Step 4: Final Tightening and Cover Installation
After all frame pieces and slats are in place, fully tighten all bolts using the provided tools. Then, carefully place the fabric cover over the assembled metal frame. The cover is designed with an elastic band and Velcro to securely attach it, similar to a fitted sheet, ensuring a snug and tidy fit.

Figure 4: The assembled metal frame with the fabric cover being applied, demonstrating how it fits over the structure.
Usage and Compatibility
The Superay 5-inch King Box Spring is designed for versatile use and can be paired with various mattress types, including innerspring, memory foam, and latex. Its low 5-inch profile is ideal for taller mattresses or for those who prefer a lower bed height. The heavy-duty metal frame and reinforced steel construction provide exceptional support, capable of holding up to 3000 lbs, ensuring your mattress remains in excellent condition.
The box spring features a noiseless design, incorporating mute foam strips to isolate contact between slats and prevent squeaking. This contributes to an uninterrupted and peaceful sleep environment.

Figure 5: An exploded diagram illustrating the typical layering of a mattress, box spring, and bed frame. Note: Mattress and bed frame are not included with the box spring.
Maintenance
To maintain the Superay Box Spring, regularly wipe the metal frame with a dry cloth to remove dust. The high-quality fabric cover is breathable, shrink-proof, and wrinkle-resistant. It can be easily removed for spot cleaning if necessary. Ensure the cover is completely dry before reattaching it to the frame.
Troubleshooting
- Squeaking Noises: If you experience squeaking, ensure all bolts are fully tightened. The box spring is designed with mute foam strips to prevent noise; verify these are correctly positioned between metal contact points.
- Instability/Wobbling: Check that all frame connections are secure and bolts are tightened. Ensure the box spring is placed on a flat, even surface.
- Difficulty during Assembly: Refer to the detailed diagrams and step-by-step instructions in the manual. Ensure parts are correctly oriented (e.g., "UP" labels facing upwards). If a part seems difficult to fit, double-check the manual for correct placement before applying excessive force.
Specifications
| Feature | Detail |
|---|---|
| Model Number | SUP-MT23 |
| Size | King |
| Product Dimensions | 78.8"L x 75.5"W x 5"H |
| Max Weight Capacity | 3000 lbs |
| Special Feature | Squeak Resistant |
| Color | Black (5 Inch) |
| Finish Type | Powder Coated |
| Included Components | Fabric Cover, Installation Manual, Slats |
| Compatible Mattress Size | King |
| Item Weight | 40.7 pounds |
| Manufacturer | Superay |
Warranty and Support
For warranty information or product support, please contact Superay customer service. Keep your purchase receipt and model number (SUP-MT23) handy for faster service. You can find contact details on the Superay official website or through your retailer.

