Skip to main content
Home / Connectors and Fasteners / Square Tube Connector Fittings, Weld-Free Cast Iron Square Steel Joint Fastening Clips for 20/25/30/40 Guardrail Joints

Attributes

Brand -
Category Industrial Small Parts / Connectors and Fasteners
Origin -
Material Cast Iron
Surface Finish Hot-Dip Galvanized
Compatible Tube Size 20 / 25 / 30 / 40 mm
Connection Type Clamp-On
Welding Required No
Screw Material Hardened Steel
Package Quantity 10 Pieces
Total Weight 2.8 kg
Usage Guardrails, Handrails, Frames
Warranty 1 Year Limited

5 reviews

A

Anonymous

Mar 17, 2026

Rating: 3/5

Screw quality varies

The connectors are fine, but one of the set screws was stripped out of the box. Spare worked though.

A

Anonymous

Mar 12, 2026

Rating: 5/5

Easy installation

Saved me a lot of time not having to weld. The clamp mechanism is tight and secure.

A

Anonymous

Mar 03, 2026

Rating: 5/5

Perfect for 30mm tubes

Fit my 30mm square tubing perfectly. Galvanized finish looks great for outdoor use.

A

Anonymous

Feb 21, 2026

Rating: 5/5

Excellent quality fittings

These connectors are very solid. Used them for a garage guardrail and they hold firmly without welding.

A

Anonymous

Feb 20, 2026

Rating: 4/5

Good but heavy

They work well and are sturdy. Just be aware they are quite heavy compared to aluminum options.

5 FAQ

Q: Are set screws included?

A: Yes, each connector comes with the necessary set screws for installation.

Q: Can I use this for structural support?

A: They are suitable for guardrails and handrails. For major structural loads, please consult an engineer.

Q: What tool is needed for installation?

A: You will typically need a hex key or wrench to tighten the set screws on the clamp.

Q: Does this fit 25mm rectangular tube?

A: Yes, these fittings are designed to accommodate 20, 25, 30, and 40 mm square or rectangular tubes.

Q: Are these rust resistant?

A: Yes, they feature a galvanized finish which provides high corrosion resistance for outdoor environments.

Explore your interests

View More
All Categories
Best Seller (30)
New List (30)
Food Warmer Cabinet, Room Temperature Commercial Constant-Temperature Display Case, Egg Tart Heating Cabinet, Small Countertop Sample Retention Cabinet, Chestnut, White

Food Warmer Cabinet, Room Temperature Commercial Constant-Temperature Display Case, Egg Tart Heating Cabinet, Small Countertop Sample Retention Cabinet, Chestnut, White

$239.00

Ultra-Narrow 8/9/10cm Bathroom and Kitchen Gap Storage Rack with Wheels

Ultra-Narrow 8/9/10cm Bathroom and Kitchen Gap Storage Rack with Wheels

$15.90

Glow-in-the-Dark 3D Printing Pen for Kids, Low-Temperature Stereoscopic Graffiti Magic Pen, Drawing Toy, Birthday Gift for Girls

Glow-in-the-Dark 3D Printing Pen for Kids, Low-Temperature Stereoscopic Graffiti Magic Pen, Drawing Toy, Birthday Gift for Girls

$21.80

Custom Insulated Steel Pipes from Factory - Heating Pipes for Residential Complexes, Spiral Insulated Pipes, Polyurethane Insulated Pipes

Custom Insulated Steel Pipes from Factory - Heating Pipes for Residential Complexes, Spiral Insulated Pipes, Polyurethane Insulated Pipes

$45.40

New Pirelli Tires 305/40R20 112V & 275/45R20 110V XL N1 for Porsche Cayenne

New Pirelli Tires 305/40R20 112V & 275/45R20 110V XL N1 for Porsche Cayenne

$1,409.00

Over-Toilet Storage Rack Wall-Mounted No-Drill Bathroom Multi-Function Organizer for Toilet Essentials

Over-Toilet Storage Rack Wall-Mounted No-Drill Bathroom Multi-Function Organizer for Toilet Essentials

$20.50

Kang Kati Gardenia Tea Scented Candle Gift Set – Long-Lasting Fragrance, Elegant Birthday Gift for Her

Kang Kati Gardenia Tea Scented Candle Gift Set – Long-Lasting Fragrance, Elegant Birthday Gift for Her

$35.10

Safety Self-Locking Lifting Hook with Adjustable Chain for Hoisting and Rigging

Safety Self-Locking Lifting Hook with Adjustable Chain for Hoisting and Rigging

$140.00

Thickened Mobile Phone Waterproof Case, Waterproof Box, Sealed Container, Pressure-Resistant Box, EDC Drop-Proof Storage Box for Outdoor Travel

Thickened Mobile Phone Waterproof Case, Waterproof Box, Sealed Container, Pressure-Resistant Box, EDC Drop-Proof Storage Box for Outdoor Travel

$12.00

Commercial Heated Display Cabinet for Crispy Pork Belly, Roast Chicken, and Cantonese BBQ - Constant Temperature Warmer for Peking Duck

Commercial Heated Display Cabinet for Crispy Pork Belly, Roast Chicken, and Cantonese BBQ - Constant Temperature Warmer for Peking Duck

$1,394.00

Mejiang Baohong Watercolor Line Art for Beginners, Coloring Book with Colored Pencils and Markers, Cat Letter Theme

Mejiang Baohong Watercolor Line Art for Beginners, Coloring Book with Colored Pencils and Markers, Cat Letter Theme

$29.70

Shanghai Huamei Hair Transplant, Solution for Hair Loss, Thinning, and Density Enhancement

Shanghai Huamei Hair Transplant, Solution for Hair Loss, Thinning, and Density Enhancement

$6,750.00

New Direct Sale Nanda Silicone Rubber 704 Battery Fixative Adhesive Panel Light Special Glue Photovoltaic Solar Sealant

New Direct Sale Nanda Silicone Rubber 704 Battery Fixative Adhesive Panel Light Special Glue Photovoltaic Solar Sealant

$25.85

Yonghe Hair Transplant: Top Scalp Density Enhancement (2000+ Units Fixed Price)

Yonghe Hair Transplant: Top Scalp Density Enhancement (2000+ Units Fixed Price)

$33,800.00

No-Drill Bathroom Storage Rack – Toilet Paper Organizer for Dorms and Restrooms

No-Drill Bathroom Storage Rack – Toilet Paper Organizer for Dorms and Restrooms

$22.16

Premium Metallographic Polishing Cloth – White Short-Pile Velvet for Mirror Finish Grinding by Goral

Premium Metallographic Polishing Cloth – White Short-Pile Velvet for Mirror Finish Grinding by Goral

$35.00

Rock Guitar Hell Training: Electric Guitar Textbook and Tutorial by Shinichi Kobayashi, Beginner to Intermediate Chinese Guitar Book and Sheet Music

Rock Guitar Hell Training: Electric Guitar Textbook and Tutorial by Shinichi Kobayashi, Beginner to Intermediate Chinese Guitar Book and Sheet Music

$58.69

Aromatherapy Candle Resin Jelly Wax Strawberry Silicone Mold, Large Squishy Handmade Soap DIY Material

Aromatherapy Candle Resin Jelly Wax Strawberry Silicone Mold, Large Squishy Handmade Soap DIY Material

$1.90

Liboer Drill-Free Security Camera Mount & Router Shelf – Adhesive-Free Wall Bracket for 360 PTZ Cameras and Sockets

Liboer Drill-Free Security Camera Mount & Router Shelf – Adhesive-Free Wall Bracket for 360 PTZ Cameras and Sockets

$21.90

City Hunter Theme Song Mr. Chui Saxophone Three-Piece Precise Transcription Service

City Hunter Theme Song Mr. Chui Saxophone Three-Piece Precise Transcription Service

$16.00

[Deposit Group 12] New Colors: Hugging Bear Matte Low-Mid Heel Lolita Shoes - Sheep Puff with Bear Buckle

[Deposit Group 12] New Colors: Hugging Bear Matte Low-Mid Heel Lolita Shoes - Sheep Puff with Bear Buckle

$38.00

Handcrafted Peach Wood and Brass Baby Rattle - Non-Toxic Paint-Free Teething Toy for Infants

Handcrafted Peach Wood and Brass Baby Rattle - Non-Toxic Paint-Free Teething Toy for Infants

$32.00

Car Tire Stone Removal Hook - Debris Cleaning Tool for Wheels

Car Tire Stone Removal Hook - Debris Cleaning Tool for Wheels

$6.19

Ceramic Rabbit Egg Holder – Creative Irregular Egg Stand for Breakfast or as a Decorative Gift

Ceramic Rabbit Egg Holder – Creative Irregular Egg Stand for Breakfast or as a Decorative Gift

$33.82

Toilet Tank Side Shelf Bathroom Storage Rack No-Drill Organizer for Bathroom Essentials

Toilet Tank Side Shelf Bathroom Storage Rack No-Drill Organizer for Bathroom Essentials

$10.40

No-Drill Over-Toilet Storage Rack for Bathroom Restroom Organizer

No-Drill Over-Toilet Storage Rack for Bathroom Restroom Organizer

$8.90

Artsneak Blending Stump for Oil Pastels, Dual-Tip Sponge Brush Art Student Painting Tool Set, Washable and Crumb-Free

Artsneak Blending Stump for Oil Pastels, Dual-Tip Sponge Brush Art Student Painting Tool Set, Washable and Crumb-Free

$14.20

75X100 Imitation Inkjet Transfer Steel Plate for Date Coding - Custom Logo and Trademark Available

75X100 Imitation Inkjet Transfer Steel Plate for Date Coding - Custom Logo and Trademark Available

$38.00

Lint-Free Cloth 1009DLE/SLE - Straight/Net Weave for UV Printhead, Screen, Lens Cleaning, Industrial Wiping Cloth

Lint-Free Cloth 1009DLE/SLE - Straight/Net Weave for UV Printhead, Screen, Lens Cleaning, Industrial Wiping Cloth

$10.80

Pirelli PZ4 Tires, Sizes 235/245/255/265/285/40/45/50/55 R19/R20/R21/R22

Pirelli PZ4 Tires, Sizes 235/245/255/265/285/40/45/50/55 R19/R20/R21/R22

$350.00