A
Anonymous
Mar 28, 2026
Rating: 5/5
Perfect for garage shelves
These connectors made building my storage rack incredibly easy. No welding needed.
Description
Product Description
Square tube connectors are suitable for building square-tube structures such as shelves, storage racks, flower stands, display frames, advertising frames, awnings, fences, and color-steel tile supports. The no-welding, no-drilling design uses set screws to fix square tubes, making installation and disassembly convenient.
Specifications and Material
Common sizes include 20×20mm, 25×25mm, and 30×30mm, fitting square tubes with different side lengths and wall thicknesses. Materials are often aluminum alloy, stainless steel, or galvanized metal. Aluminum alloy models are lightweight and suitable for movable structures, while stainless steel or galvanized models offer better rust resistance for outdoor use.
Connection Method
The connector tightens the square tube through built-in set screws or screws without welding or threading. According to structural needs, choose straight connectors, elbows, tees, four-way connectors, bases, and other accessories to build different frame shapes.
Selection Advice
Before purchase, accurately measure the outer side length, wall thickness, and connection angle of the square tube, and confirm whether set screws, screws, and required accessories are included. Load-bearing structures should use thicker materials and have reliable locking checked.
Reviews
Attributes
| Brand | - |
| Category | Industrial Small Parts / Connectors and Fasteners |
| Origin | - |
| Material | Stainless Steel & Galvanized Carbon Steel |
| Compatible Tube Size | 20mm, 25mm, 30mm, 40mm |
| Installation Method | Clamp-on (No Welding Required) |
| Drilling Required | No |
| Surface Finish | Zinc Plated |
| Color | Silver |
| Brand | Hujian |
| Item Weight | 0.45 kg per set |
| Load Capacity | Varies by frame structure |
| Application | DIY Shelving, Storage Racks |
5 reviews
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Anonymous
Mar 12, 2026
Rating: 4/5
Sturdy but tight fit
Good quality metal. The clamp was a bit tight on the 25mm tube but manageable.
A
Anonymous
Feb 22, 2026
Rating: 4/5
Good value
Cheap way to build custom racks. Instructions could be more detailed.
A
Anonymous
Feb 10, 2026
Rating: 5/5
No rust so far
Used these in a humid basement. The galvanization seems to be holding up well.
A
Anonymous
Feb 07, 2026
Rating: 5/5
Saved me time
Exactly what I needed for a quick DIY project. Very stable once assembled.
5 FAQ
Q: Will this fit a 30mm square tube?
A: Yes, please select the 30mm option from the variant menu.
Q: Is this suitable for outdoor use?
A: Yes, the galvanized finish provides rust resistance for outdoor environments.
Q: Do I need special tools for installation?
A: No, standard wrenches or screwdrivers are sufficient depending on the bolt type.
Q: How many connectors are in one package?
A: Packages vary by selection. Please check the specific SKU details before ordering.
Q: What is the maximum weight capacity?
A: Capacity depends on the tube thickness and overall frame design. Recommended for standard shelving.
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