When purchasing supermarket shelves or warehouse racks, you may notice that products are divided into main frames and add-on frames. Many buyers are confused at first — why are there two types, and which one should you choose? Here’s a simple explanation.
What is a Main Frame?
The main frame is a complete, independent shelving unit. It includes two uprights, beams, shelves, and all necessary parts, so it can stand alone without connecting to other shelves.
Think of it as the “starter unit” of a shelving system.
What is an Add-on Frame?
The add-on frame (sometimes called auxiliary frame) is an extension unit. It comes with one upright, beams, and shelves, and shares one upright with the main frame.
An add-on frame cannot stand alone; it must connect to a main frame or another add-on frame.
Why Use Main + Add-on Frames?
- Save cost: Add-on frames require fewer uprights, which reduces overall expense.
- Flexible expansion: Start with one main frame and easily add more units as needed.
- Neat and professional look: Connected frames form a smooth and continuous shelving line.
Example: If you need 5 units, you don’t have to buy 5 main frames. Instead, you only need 1 main frame + 4 add-on frames, which is more economical.
Conclusion
- Main Frame= a complete, stand-alone shelf.
- Add-on Frame= an extension shelf connected to a main frame.
By combining them, you get a shelving system that is strong, cost-effective, and easy to expand — perfect for both supermarkets and warehouses.
About Jinboxin
At Jinboxin Commercial Equipment Co., Ltd., we specialize in supermarket shelving and warehouse racking with over 22 years of experience. Our products are made with high-quality steel, advanced automation, and strict quality control to ensure strength, durability, and competitive pricing.
Contact us today to get expert advice and a free quotation for your shelving needs.
Sourcing Gondola Shelving for Your Store?
JBX Shelf manufactures supermarket gondola shelving in Changshu, Suzhou — available in both standard and custom configurations. Share your floor plan and our export team will provide a full bay layout drawing and quotation within 24 hours.
