Introduction
Thank you for choosing the Mainstays 7" Adjustable Metal Bed Frame. This frame is designed to provide robust support for your mattress and box spring, offering versatility for Twin, Full, or Queen size beds. Its heavy-duty steel construction ensures durability and stability, while the no-tools assembly simplifies setup.
Key features include:
- Easy, no-tools assembly.
- Constructed from heavy-duty, durable, embossed, powder-coated steel.
- Integrated headboard brackets for convenient attachment.
- Adjustable center support bars to accommodate Twin, Full, or Queen size mattresses.
- Nine welded legs and a center support bar for enhanced stability.
- Capped feet to protect flooring.
Safety Information
Please read and understand all safety warnings before assembly and use. Failure to follow these instructions may result in injury or product damage.
- Weight Capacity: Do not exceed the maximum weight capacity of 2,000 lbs (907.19 kg). This includes the combined weight of the mattress, box spring, and occupants.
- Ensure all connections are securely fastened before placing a mattress or using the bed.
- Keep small parts away from children during assembly.
- Always lift with your legs, not your back, when moving heavy components.
- The legs on the outer edge of the frame are slightly recessed for safety. Be aware of the frame's perimeter to prevent tripping.
Product Features
The Mainstays Adjustable Metal Bed Frame offers several design elements for convenience and durability:
- Adjustable Design: Easily converts to Twin, Full, or Queen sizes.
- Durable Construction: Made from heavy-duty steel with a powder-coated finish for longevity.
- Integrated Headboard Brackets: Allows for direct attachment of most standard headboards.
- Floor Protection: Feet are capped to prevent scratches and damage to flooring.
- Enhanced Stability: Features 9 welded legs and a central support bar.
Setup & Assembly
This bed frame is designed for easy, no-tools assembly. Follow these steps for a quick and secure setup.
- Unpack Components: Carefully remove all parts from the packaging. Ensure all components are present and undamaged.
- Assemble Frame Sides: Lay out the frame components on a clean, flat surface. Connect the side rails by sliding the interlocking pieces together until they lock securely.
- Insert Center Support Bars: Position the center support bars between the assembled side rails. These bars will also slide and lock into place.
- Adjust to Desired Size: The frame is adjustable for Twin, Full, or Queen sizes. Locate the adjustment points on the frame. To adjust, press the release mechanism (if present) and slide the frame sections to the desired width. Ensure the frame locks into the correct position for your mattress size (T for Twin, F for Full, Q for Queen).

Image: Diagram illustrating the adjustable width settings for Twin, Full, and Queen sizes.

Image: A hand demonstrating the 'Press & Pull' mechanism for adjusting the frame size.
- Secure All Connections: Double-check that all frame sections are fully engaged and locked. The frame should feel rigid and stable.

Image: Detail of a securely connected corner joint on the metal bed frame.
- Attach Headboard Brackets (Optional): If you plan to use a headboard, attach it to the built-in headboard brackets at the top of the frame. Ensure the headboard is securely fastened.

Image: Close-up view of the integrated headboard brackets.
- Place Box Spring and Mattress: Once the frame is fully assembled and adjusted, carefully place your box spring and mattress onto the frame.

Image: The Mainstays adjustable metal bed frame fully assembled.

Image: The bed frame with a box spring and mattress in place.
Operating Instructions
The primary operation of this bed frame involves adjusting its size to fit your mattress and box spring.
- Adjusting Frame Size: To change the frame from Twin to Full or Queen, or vice versa, first remove the mattress and box spring. Locate the adjustment points on the frame's side rails and center bars. Press the release buttons or mechanisms and slide the frame sections to expand or contract to the desired size. Ensure the frame clicks into place for the selected size (Twin, Full, or Queen) before replacing the box spring and mattress.
Maintenance
Proper care will extend the life of your bed frame.
- Cleaning: Wipe the metal frame with a damp cloth and mild soap as needed. Avoid harsh chemicals or abrasive cleaners that could damage the powder-coated finish.
- Regular Inspection: Periodically check all connections and bolts to ensure they remain tight and secure. Tighten any loose fasteners.
- Floor Protection: The frame includes non-slip pads on the feet to protect your flooring. Ensure these pads remain in place. If they become worn or detached, replacements may be available or generic floor protectors can be used.

Image: Detail of a non-slip pad on the bed frame's support leg.
Troubleshooting
If you encounter issues with your bed frame, consider the following common solutions:
- Squeaking Noises: Squeaking often indicates loose connections. Re-check and tighten all bolts and interlocking mechanisms. Ensure the frame is properly adjusted to the correct size and fully locked.
- Instability/Wobbling: Verify that the frame is assembled on a level surface. Ensure all legs are making firm contact with the floor and that all connections are secure. Check that the center support bar is correctly installed and supporting the frame.
- Difficulty Adjusting Size: Ensure the mattress and box spring are removed before attempting to adjust the frame size. Press the release mechanisms firmly and slide the sections smoothly. Do not force the adjustment.
Specifications
| Feature | Detail |
|---|---|
| Model Number | B0756C1NJ7 |
| Brand | Mainstay |
| Material | Metal |
| Color | Black |
| Assembled Size (Queen) | 75" L x 59.5" W x 7" H |
| Storage Size (Packaged) | 37.05" x 4.92" x 5.71" |
| Weight Capacity | 2,000 lbs (907.19 kg) |
| Compatible Mattress Sizes | Twin, Full, Queen |
| Number of Legs | 9 welded legs |
| Special Feature | Adjustable, Built-in Headboard Brackets |
Warranty & Support
For warranty information or customer support, please refer to the product packaging or contact Mainstays customer service directly. Keep your purchase receipt for any warranty claims.
For further assistance, please visit the Mainstays official website or contact their customer support line.





