Weld-free, drill-free galvanized carbon steel connectors for 20 / 25 / 30 / 40 mm square tubes. One-piece cast joints with hex-screw fixing — build racks, frames, fences, shelving and exhibits in minutes.
Precision-machined galvanized steel joints designed for quick assembly and years of service.
Fits square tube 20–21mm, 25–26mm, 30–31mm and 40–41mm with a firm, wobble-free joint.
No welding, no drilling. Slide the tube in, tighten the hex screws with an Allen key — done.
Hot-dip galvanized surface resists rust and wear — indoor and outdoor frames stay solid for years.
T-tee, elbow, 3D tee, 3D cross, base plate, straight coupler, supports and more — one-stop sourcing.
| Item | Detail |
|---|---|
| Product | Square Tube Frame Connectors |
| Material | Galvanized Carbon Steel |
| Finishing | Hot-dip galvanized, smooth surface |
| Tube Sizes | 20×20 · 25×25 · 30×30 · 40×40 mm |
| Features | Wear-resistant / Drill-free / Weld-free |
| Fixing | Hex-socket screws (Allen key) |
| Application | Frames, racks, fences, shelving, greenhouses, exhibits, canopies |
| Packing | Carton + pallet, export standard |
| Price | From $0.82/pc (FOB China, wholesale) |
Other sizes and mixed models quoted within 24 hours — volume discounts available.
| Type | Part |
|---|---|
| T-Tee | 3-way flat joint |
| Elbow | 90° corner joint |
| 3D Tee / 3D Cross / 3D 5-Way | Multi-direction joints |
| Long Tee / Diagonal Tee | Extended & angle tees |
| Flat Cross / Cross Tee | Crossing joints |
| Straight Coupler / M-Straight | Inline extension joints |
| Base Plate | Floor / wall mounting base |
| Single Side · Edge Support · Top Support · Diagonal Brace | Support & brace fittings |
| Socket · Inner Coupler · Base Kit · Hinge · Single Ear | Accessories (on request) |
Each model is available for 20/25/30/40mm tubes — ask for the full pricelist.
| Type | USD / pc |
|---|---|
| T-Tee | $0.86 |
| Elbow | $1.19 |
| 3D Tee | $1.48 |
| 3D Cross | $1.40 |
| Long Tee | $1.79 |
| Flat Cross | $1.40 |
| Base Plate | $1.30 |
| Straight Coupler | $1.34 |
| 3D 5-Way | $1.77 |
| Single Side | $1.05 |
| Edge Support | $2.68 |
| Top Support | $2.68 |
| Diagonal Brace | $2.33 |
| M-Straight | $1.44 |
| Diagonal Tee | $1.30 |
| Cross Tee | $1.11 |
| Socket | $1.11 |
| Inner Coupler | $1.01 |
| Plate Holder | $0.91 |
| Base Kit | $3.50 |
| Base | $1.75 |
| Hinge | $2.04 |
| Single Ear | $0.82 |
| Type | USD / pc |
|---|---|
| T-Tee | $1.09 |
| Elbow | $1.40 |
| 3D Tee | $1.59 |
| 3D Cross | $1.59 |
| Long Tee | $1.40 |
| Flat Cross | $1.40 |
| Base Plate | $1.39 |
| Straight Coupler | $2.10 |
| 3D 5-Way | $2.33 |
| Single Side | $1.22 |
| Edge Support | $3.50 |
| Top Support | $3.50 |
| Diagonal Brace | $2.92 |
| M-Straight | $2.24 |
| Diagonal Tee | $1.91 |
| Cross Tee | $1.52 |
| Socket | $1.40 |
| Inner Coupler | $2.00 |
| Plate Holder | $1.26 |
| Base Kit | $3.69 |
| Base | $1.94 |
| Hinge | $2.59 |
| Single Ear | $1.22 |
| Type | USD / pc |
|---|---|
| T-Tee | $1.75 |
| Elbow | $2.33 |
| 3D Tee | $2.53 |
| 3D Cross | $2.33 |
| Long Tee | $2.92 |
| Flat Cross | $2.33 |
| Base Plate | $2.39 |
| Straight Coupler | $2.37 |
| 3D 5-Way | $2.72 |
| Single Side | $1.65 |
| Edge Support | $5.25 |
| Top Support | $5.25 |
| Diagonal Brace | $4.08 |
| M-Straight | $2.88 |
| Diagonal Tee | $2.92 |
| Cross Tee | $2.45 |
| Socket | $2.22 |
| Inner Coupler | $1.85 |
| Plate Holder | $1.85 |
| Base Kit | $4.08 |
| Base | $2.14 |
| Hinge | $4.08 |
| Single Ear | $1.65 |
| Type | USD / pc |
|---|---|
| T-Tee | $2.14 |
| Elbow | $3.50 |
| 3D Tee | $4.08 |
| 3D Cross | $3.40 |
| Long Tee | $5.05 |
| Flat Cross | $3.30 |
| Base Plate | $4.86 |
| Straight Coupler | $4.28 |
| 3D 5-Way | $5.25 |
| Single Side | $2.53 |
| Edge Support | $7.58 |
| Top Support | $7.58 |
| Diagonal Brace | $6.22 |
| M-Straight | $4.67 |
| Diagonal Tee | $5.05 |
| Cross Tee | $3.89 |
| Socket | $3.07 |
| Inner Coupler | $2.72 |
| Plate Holder | $2.33 |
| Base Kit | $4.67 |
| Base | $2.33 |
| Hinge | $4.67 |
| Single Ear | $2.95 |
Prices are per piece (pc), exclusive of shipping. All models fit 20/25/30/40mm square tubes. Wholesale & volume discounts available — contact us via WhatsApp.
All models below fit 20×20mm tube (20–21mm) and are also available in 25/30/40mm — each with an installation view.
Tell us your tube size, models and quantity — a detailed USD quotation within 24 hours.
