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RUAll fittings are measured against design specifications to guarantee accurate tube diameters, sleeve alignment, and bolt placements, ensuring a perfect fit for system integration and safe installation.
1. Higher Standard Certification
2. Perfect Production Solution
3. More Corrosion Resistant
4. Comprehensive After Service
5. Wide-ranging Application
The Add on Crossover, also known as Split Crossover, is designed for adding a perpendicular pipe to an already installed system. Its split-sleeve structure makes installation easy without dismantling existing pipes. HULK Metal ensures each fitting is durable, precisely manufactured, and treated for corrosion resistance, providing reliable performance for guardrail, handrail, fence, and other structural applications.
Our Add on Crossover Structural Pipe Fittings are available in various sizes and materials to suit different construction needs. Each fitting can be made of malleable iron, ductile iron, or customized materials, with surface treatments such as galvanizing or powder coating for enhanced corrosion resistance. Standard tube sizes include 33.7mm, 42.4mm, and 48.3mm, but we also provide customizable options to meet special project requirements.
| Pipe Info | |||
 | |||
| Material | Carbon Steel | ||
| Surface | Hot Galvanized / Powder Coating | ||
| Color | Refer To Pantone Color Card | ||
| Pipe Sizes Comparison | |||
| Size | Inner Diameter | Outer Diameter | |
| Nominal (DN) | in | mm | |
| T | 15 | 1/2" | 21.3 |
| A | 20 | 3/4" | 26.9 |
| B | 25 | 1" | 33.7 |
| C | 32 | 5/4" | 42.4 |
| D | 40 | 3/2" | 48.3 |
| E | 50 | 2" | 60.3 |
| Color only refers to the color of the powder coating. The powder coating of the pipe will allow for color tolerance, Kindly contact us for details. The quality of the tube will meet the usage requirements in most scenarios. For special scenarios, Kindly contact us for performance testing. | |||
| Basic Info Table of Fittings | |||||||||||
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| Name | 137 Add on Crossover Pipe Fitting | ||||||||||
| Material | Malleable Iron / Ductile Iron | ||||||||||
| Surface | Hot-dip Galvanized / Double Galvanized / Powder Coating / Raw Black | ||||||||||
| Color | Refer To Pantone Color Card | ||||||||||
| Pipe Sizes Comparison | Surface Finishing & Code | Dimensions(mm) | |||||||||
| Size | DN | in | mm | Hot-dip Galvanized | Double Galvanized | Powder Coating | Raw Black | a | b | C | D |
| B | 25 | 1" | 33.7 | HM-G-137-B | HM-D-137-B | HM-PC-137-B | HM-B-137-B | 53.5 | 41 | ||
| C | 32 | 5/4" | 42.4 | HM-G-137-C | HM-D-137-C | HM-PC-137-C | HM-B-137-C | 61.4 | 50 | ||
| D | 40 | 3/2" | 48.3 | HM-G-137-D | HM-D-137-D | HM-PC-137-D | HM-B-137-D | 67 | 55 | ||
The Add on Crossover Structural Pipe Fitting, also known as Split Crossover, is specially designed to connect an additional pipe to an existing system without disassembly. Its unique hinged sleeve structure makes installation easier and more efficient. Widely used in guardrail, handrail, fence, and DIY structures, it offers strong adaptability, durability, and reliable performance. HULK Metal provides multiple materials and surface treatments to meet various applications.
The Add on Crossover, also known as Split Crossover, is designed to add a perpendicular pipe onto an already installed system. This feature eliminates the need to dismantle existing structures, saving time and labor. It is widely applied in guardrails, handrails, fences, and DIY structural projects, ensuring better adaptability and flexibility for engineers and builders.
The fitting consists of two sleeves positioned perpendicular to each other. One sleeve is split with a hinged opening and secured by a hexagon socket bolt, allowing it to clamp firmly onto an existing pipe. Due to its structural design, there will be a small gap between connected pipes.
The split sleeve is clamped tightly onto the chosen pipe of an existing system using bolts, while the other sleeve holds a new pipe in place. This allows secure and stable perpendicular connections without dismantling the original framework.
The Add on Crossover allows perpendicular extensions on already installed systems, eliminating the need to rebuild or disassemble. It saves time, reduces labor costs, and improves flexibility for system modifications. It is particularly useful in enhancing existing guardrail, handrail, and fence structures with minimal installation effort.
Guardrail, Handrail, Fence Systems: Add mid-rails to the outside of uprights for enhanced safety and protection strength.
DIY Structures: Attach a perpendicular pipe to any chosen section of an existing pipe, making structures more versatile and adaptable.
Industrial & Commercial Projects: Used in warehouses, workshops, and outdoor facilities to strengthen frameworks or expand systems without dismantling.
Temporary Structures: Ideal for quick modifications or expansions of temporary railings and barriers.
Overall, it provides engineers, contractors, and DIY users with a convenient way to upgrade or reinforce existing systems.
Confirm the size of the Add on Crossover fits the pipe diameter and load-bearing requirements of your system.
Ensure the selected surface treatment (hot-dip galvanizing, double-coating galvanizing, powder coating) matches the working environment and durability expectations.
Choose a supplier with strict quality management systems such as ISO 9001 certification. A reliable factory should provide dimensional accuracy, consistent performance, and corrosion resistance. This ensures your Add on Crossover fittings meet international standards and maintain long-term reliability, especially in guardrail, handrail, and safety-critical applications.
Evaluate the supplier's production capacity and factory scale. A larger factory with advanced equipment and professional teams can handle bulk orders efficiently, ensuring timely delivery and consistent quality. This helps reduce lead times, improve inventory management, and support long-term stable supply for your projects and clients.
Check whether the supplier offers flexible customization services. Projects often require special sizes, materials, or surface treatments. A capable supplier should be able to provide OEM/ODM services, develop molds, and adapt to specific engineering requirements. This ensures your Add on Crossover fittings fit perfectly into your unique applications.
Consider the after-sales service and support provided by the supplier. A professional supplier should offer product guarantees, replacement policies, and consultation services. Comprehensive after-service helps solve potential issues quickly, gives you confidence in long-term cooperation, and strengthens your market competitiveness when supplying clients with structural pipe fittings.
A: We have a fully equipped quality inspection center, rigorous testing procedures, and a complete quality assurance system. Each Add on Crossover undergoes dimensional checks, performance testing, and surface treatment inspections before delivery to guarantee consistency and reliability.
A: The price depends on raw materials, size, surface treatment, and order quantity. Since we own a factory, we can offer real-time quotes and competitive pricing directly without middlemen, ensuring better cost control for your bulk purchase.
A: All prices are based on guaranteed high quality. With the same quality, our prices are more competitive. Larger order quantities reduce production costs, allowing you to enjoy better discounts and maximize your purchasing efficiency with HULK Metal.
A: The MOQ depends on the product size and surface treatment requirements. We are flexible with small trial orders and can also handle bulk production. Contact us anytime for a personalized quotation and order plan.
A: Delivery depends on your order requirements. Normally, it takes around 30 days, while larger orders benefit from higher production efficiency. In most cases, the delivery time will not exceed 45 days, ensuring timely supply for your projects.
A: We provide hot-dip galvanizing, double-coating galvanizing, and powder coating. Customized powder coating colors require a MOQ. Each finish is selected based on the project's durability, environment, and aesthetic requirements.
A: HULK Metal exports to over 50 countries across Europe, North America, South America, Africa, and Southeast Asia. Our global logistics partners ensure safe packaging, reliable delivery, and stable long-term cooperation with clients worldwide.
A: We mainly produce cast iron structural pipe fittings with full mold sets. Stainless steel and aluminum fittings are also available, but these require mold development and OEM production. We can customize materials based on your project needs.
A: Standard sizes include 33.7mm, 42.4mm, and 48.3mm tube diameters. We also support customized sizes to fit specific systems. Our engineering team can design and produce according to your exact project requirements, ensuring a perfect structural match.
A: We accept multiple payment methods, including T/T, L/C, and other flexible options. Delivery terms such as FOB, CIF, and EXW are supported to meet different trading needs. Contact us for detailed arrangements.
We first confirm your requirements, including surface treatment, quantity, packaging methods, delivery terms, and payment method. Our professional team ensures that every production detail matches your project specifications, providing a customized solution for your bulk order needs.
Raw materials are purchased from reliable suppliers and inspected for chemical composition, strength, and durability. Strict material testing ensures that only qualified malleable iron, ductile iron, or stainless steel enters production, guaranteeing the final fittings meet international standards.
Our production follows a standardized process, including casting, machining, finishing, and surface treatment. Each step is executed under strict quality control systems to ensure dimensional accuracy, structural strength, and corrosion resistance, meeting bulk buyers' requirements efficiently and consistently.
Using advanced casting equipment, molten metal is poured into precision molds. The process ensures accurate shape formation and strong structural integrity. We use both automatic and semi-automatic casting lines to achieve consistency for large-scale Add on Crossover production.
After casting, the parts are cleaned, trimmed, and machined to remove burrs and irregularities. Finishing ensures smooth surfaces, accurate dimensions, and precise fit for pipe assembly. This step prepares the fittings for high-quality surface treatments and final inspections.
Every finished part undergoes inspection for dimensional accuracy, surface defects, and material strength. Advanced testing equipment and strict inspection standards guarantee that only qualified products move to the assembly stage, ensuring stable quality across large order quantities.
Each Add on Crossover is assembled with hexagon socket bolts and tested for fit and performance. The assembly process ensures structural stability, secure connections, and reliable function for guardrail, handrail, and fence systems in both industrial and DIY applications.
We provide hot-dip galvanizing, double-coating galvanizing, or powder coating, depending on client requirements. Each treatment enhances corrosion resistance and surface durability. Careful process control ensures thicker, more uniform coatings, extending the lifespan of the Add on Crossover fittings.
Final inspections are conducted on surface coating thickness, uniformity, and appearance. Mechanical tests verify structural strength. Only fittings that pass all inspections are approved for packaging. This double-check system ensures that every Add on Crossover meets international standards.
Products are packed securely using customized packaging methods to prevent damage during transport. We offer flexible delivery solutions, cooperating with reliable logistics partners. Orders are shipped on time, with documentation and tracking provided for your convenience and peace of mind.
Upon receiving goods, customers can check product quality and quantity. Any fittings with quality issues are eligible for return, exchange, or restocking services. We also provide technical support and consultation, ensuring long-term cooperation and customer satisfaction with HULK Metal.
HULK Metal implements strict quality control throughout the production of Add on Crossover Structural Pipe Fittings. From raw material inspection to pre-shipment checks, each stage is monitored to ensure dimensional accuracy, structural integrity, and surface quality. Our QC team conducts rigorous usage tests, quantity verification, and final inspections, ensuring that every fitting meets ISO, CE, GB, and TUV standards, providing bulk buyers with reliable, durable, and high-performance products.
All fittings are measured against design specifications to guarantee accurate tube diameters, sleeve alignment, and bolt placements, ensuring a perfect fit for system integration and safe installation.
Before delivery, fittings are visually and mechanically inspected to ensure compliance with quality standards, packaging integrity, and surface treatment consistency, reducing the risk of defects reaching clients.
Functional tests simulate real-world applications, including load-bearing and stress tests, to verify structural stability and the performance of Add on Crossover fittings under operational conditions.
Each order is carefully counted and verified to match client requirements, ensuring no shortage or excess, supporting accurate inventory management, and timely project execution.
HULK Metal operates a fully equipped factory exceeding 10,000 ㎡, integrating casting, machining, surface treatment, and assembly. Advanced production equipment and a professional workforce allow us to efficiently produce high-quality Add on Crossover fittings for bulk orders. Our on-site QC center and dedicated logistics team ensure products meet strict international standards, maintain consistent quality, and are delivered promptly worldwide.
HULK Metal offers Add on Crossover fittings with ISO 9001 certification and CE, GB, TUV approvals, ensuring superior quality. Our factory, experienced team, and advanced equipment allow large-scale production with precise specifications. We focus on corrosion-resistant surface treatments, comprehensive after-sales support, and customized solutions, helping bulk buyers obtain reliable, durable, and cost-effective structural pipe fittings. Professional guidance and production transparency enhance client confidence and project efficiency.
Explore related articles to gain deeper insights into Add on Crossover Structural Pipe Fittings, including installation tips, maintenance advice, and application examples. Learn how these fittings enhance guardrail, handrail, fence, and DIY systems. Images, diagrams, and case studies demonstrate practical usage, helping engineers, contractors, and bulk buyers make informed decisions. HULK Metal shares technical knowledge to support efficient project planning, safe installation, and improved system performance.
HULK Metal offers a wide range of structural pipe fittings beyond Add on Crossovers. These include 90 Degree Elbow, Short Swivel Tee, Three Socket Cross, Adjustable Short Tee, Single Swivel Combination, and more. All fittings are available in malleable iron, ductile iron, and other materials with customized surface treatments. Our comprehensive catalog supports versatile construction projects, enabling bulk buyers to source high-quality fittings from a single trusted supplier, ensuring efficiency, reliability, and cost-effectiveness.
Our handrail bracket structural pipe fittings have multi-type surface treatments to prevent corrosion, precise dimensions, and a strong load-bearing capacity. They provide a longer service life and a more secure installation, making them perfect for outdoor safety rails, balconies, and staircases.
The Internal Swivel Tee Structural Pipe Fitting allows a 360 deg rotation around the connection point, making it ideal for angled rail systems. Manufactured from malleable iron or ductile iron with multiple finish options, it provides stronger performance and longer service life.
The Three Socket Angle Tee Structural Pipe Fitting is an essential component for angled guardrails and handrails. It connects two top rails to an upright post with adjustable angles from 0 to 11 degrees, ensuring both safety and flexibility.
The Slope Short Tee is specially designed for guardrail and handrail systems with slopes from 0 to 11 degrees. Its internal socket allows for the precise adjustment and secure fixing of uprights using hex bolts.
Malleable Iron/Ductile Iron/Customizable
Galvanized/Powder-coat/Customizable
TUBE SIZE(mm)
26.9
33.7
42.4
48.3
Customizable
HULK Metal supplies base flange structural pipe fittings made of durable materials with multiple surface finishes. They are designed for stronger pipe connections and longer service life. Our modern factory, professional team, and strict inspection ensure higher-standard products for your projects.
HULK Metal manufactures high-standard railing base flange structural pipe fittings with ISO 9001 certification. Our fittings feature precise dimensions, reliable strength, and multiple surface treatments, ensuring durability and excellent performance in both indoor and outdoor applications for handrail and guardrail systems.
The Short Swivel Tee Structural Pipe Fitting is widely used in handrail and guardrail systems where angled connections are required. Manufactured by HULK Metal with strict ISO 9001 standards, it offers strength, flexibility, and long service life.
Malleable Iron/Ductile Iron/Customizable
Galvanized/Powder-coat/Customizable
TUBE SIZE(mm)
26.9
33.7
42.4
48.3
60.3
33.7/26.9
Customizable
The Swivel Base Flange is engineered to secure pipes to walls with adjustable angles from 0° to 180°. Its modular design ensures easy assembly, reliable stability, and compatibility with multiple pipe sizes and materials.
The Corner Swivel Combination structural pipe fitting is designed to connect pipes set at right angles across perpendicular planes.
The Add on Crossover, also known as Split Crossover, is designed for adding a perpendicular pipe to an already installed system. Its split-sleeve structure makes installation easy without dismantling existing pipes.
The 90 Degree Two Way Elbow structural pipe fitting is designed for connecting two pipe ends at a right angle. It is commonly applied in handrail, guardrail, and fence systems, ensuring strong and stable joints.
Our Four Socket Cross Structural Pipe Fitting comes in various sizes and surface treatments to suit different projects. Made from malleable iron or ductile iron and customizable on request, these fittings are durable and corrosion-resistant.
Clamp on Crossover Structural Pipe Fittings are designed to create perpendicular connections between pipes without requiring dismantling of existing structures. They feature a strong clamping design that ensures tight, gap-free joints.
The Offset Crossover Structural Pipe Fitting is designed to connect two pipes securely in an offset crossing structure. It allows builders to easily create strong and stable frameworks while maintaining flexibility for different structural needs.
The 90 Degree Two Socket Tee offers two perpendicular sockets for secure pipe connections. It is engineered to provide precise alignment and exceptional strength in guardrails, handrails, fencing, and DIY structures.
Three Socket Cross Structural Pipe Fittings connect vertical uprights with three perpendicular horizontal pipes, offering robust support for fencing, storage racks, and DIY systems. Their versatile design allows easy installation and configuration, ensuring durability and stability in multiple applications.
HULK Metal's Clamp on Tee Structural Pipe Fittings are engineered for secure, easy installation on existing systems. Made from high-quality malleable or ductile iron, they support durable, stable connections for guardrails, handrails, and DIY structures.
Two Socket Cross Structural Pipe Fittings are designed to connect upright pipes with two perpendicular pipes in the same plane. Manufactured from high-quality cast iron, stainless steel, or aluminum, these fittings undergo strict inspection and advanced surface treatment
Malleable Iron/Ductile Iron/Customizable
Galvanized/Powder-coat/Customizable
TUBE SIZE(mm)
26.9
33.7
42.4
48.3
Customizable
HULK Metal manufactures high-quality Three Socket Tee (Long Tee) Structural Pipe Fittings that combine strength, precision, and reliability. Made from malleable or ductile iron with customizable finishes such as galvanizing or powder coating, these fittings are ideal for both industrial and DIY applications.
The side outlet elbow, also called a 3-way elbow, is designed to connect three pipes at 90° angles. It provides strength and stability in guardrails, handrails, and cube-like structures.
HULK Metal's Variable Swivel Elbow is engineered for versatile pipe-joining applications. With angles ranging from 73° to 287°, it provides maximum flexibility for complex structures.
HULK Metal's Reducing Short Tee Structural Pipe Fitting is engineered to provide a secure vertical pipe connection with different diameters, ideal for mid-rails or guardrail top rails.
The Single Socket Tee Structural Pipe Fitting, also known as Short Tee, is widely used in railing systems, guardrails, and DIY structures. It allows one pipe to connect securely at a right angle to another, forming a stable "T" connection.
The Single Lugged Bracket Structural Pipe Fitting is a reliable solution for fixing pipes onto walls or panels where limited space prevents double lug use.
The Vertical Railing Side Support Structural Pipe Fitting is designed to provide strong and stable support for railing systems. Manufactured with malleable iron or ductile iron, and available in multiple surface treatments such as hot-dip galvanizing or powder coating, these fittings ensure long-term durability.
The Cradle Clamp Structural Pipe Fitting is designed to fasten pipe rails securely to uprights. Its open clamp structure allows quick installation, while inner hex bolts ensure reliable stability.
Horizontal Railing Side Support Structural Pipe Fittings are designed to fasten railing uprights firmly against walls or side structures.
The Adjustable Short Tee is engineered to connect pipes at variable angles from 30 deg to 60 deg. Its durable structure, simple installation, and flexible design make it suitable for guardrail and handrail systems.
The Single Swivel Combination is formed by joining two swivel fittings, making it ideal for environments requiring flexible angle adjustments. While it cannot independently bear lateral loads, it becomes effective when used together with other fittings.
The Add on Short Tee Structural Pipe Fitting is a hinged socket fitting that allows vertical connections to existing pipe systems without dismantling.
HULK Metal Variable Elbow Structural Pipe Fitting is designed to create secure and adjustable angled connections between pipes. With a strong structure and reliable locking bolts, it delivers stability and precision.
HULK Metal Adjustable Angle Two Socket Cross Structural Pipe Fitting provides a strong and flexible connection between uprights and rails. Designed for rail systems with slopes from 45° to 90°, it is widely used in stairways, handrails, and ramps.
The Galv Ground Socket Structural Pipe Fitting is designed to provide secure support for uprights in diverse ground conditions. Made of high-strength malleable or ductile iron, it ensures long-term stability and durability.
The Side Palm Fixing Structural Pipe Fitting is engineered to provide a solid and secure connection for railing uprights against walls, stairs, or ramps. Its three-lug design with reinforced sockets improves stability and load capacity.
The Double Lugged Bracket Structural Pipe Fitting is engineered to mount pipes flush against flat walls or panels. Featuring two lugs with fixing holes, it supports various screw or chemical fixing methods. Its socket with hex bolts firmly secures the pipe in place.
The Double Male Swivel Structural Pipe Fitting is designed for flexible joint connections and works seamlessly with single swivel female parts to form a stable structure.
Malleable Iron/Ductile Iron/Customizable
Galvanized/Powder-coat/Customizable
TUBE SIZE(mm)
26.9
33.7
42.4
48.3
60.3
Customizable
Hook structural pipe fittings provide temporary mounting points on pipes. Designed for horizontal and vertical installation, they ensure user safety with rounded heads and secure locking via hex bolts. This solution is suitable only for incomplete systems.
The slope railing base flange pipe fitting is designed to secure inclined uprights to the ground with adjustable angles. Manufactured with strict quality control, it offers multiple surface treatments, ensuring strength, corrosion resistance, and suitability for diverse railing and structural applications.
Our gate hinge pipe fittings combine robust materials with precision casting to create dependable connections for gates. With multiple surface treatments and sizes available, they meet diverse installation requirements, deliver excellent corrosion resistance, and provide a secure, smooth rotational function.
Gate Eye Pipe Fittings provide a reliable hinge connection for gates and handrail systems. Made from strong cast iron or flexible ductile iron, they come with different surface finishes, providing great performance, a longer lifespan, and making them suitable for many construction and industrial uses.
No. 101 galvanized pipe handrail fittings are used to connect two pipes into a "T" shape. It is also called a Pipe Clamp Short Tee. One pipe is inserted into the socket, and the other one passes through the channel above.
101 Reducing Short Tee Galvanized Pipe Railing Fittings are often used. HULK Metal is a well-known supplier in China. We look forward to your inquiry.
104 galvanized slip-on pipe fittings long tee can be used to add two horizontal pipes to the guardrail or handrail uprights, or to connect two pipes in a DIY structure and add a vertical pipe to them.
104 galvanized slip-on pipe fittings long tee can be used to add two horizontal pipes to the guardrail or handrail uprights, or to connect two pipes in a DIY structure and add a vertical pipe to them.
116A Galvanized Pipe Guardrail Fittings Add On Side-outlet Tee is used to add two perpendicular rails to an already assembled handrail or guardrail uprights, or to add two perpendicular pipes to an assembled DIY structure such as a cube or cuboid.
119 Galvanized Safety Railing Fittings Two Socket Cross is used to add two pipes on the same plane to form a cross structure for a specific position of a pipe.
We integrated a complete supply chain, passed ISO 9001 certification, formed a professional technical team and produced a full range models of the galvanized pipe connector fittings to provide the best services and products. Looking forward your inquiry.
The 119A Galvanized Railing Connectors Add-on Two Socket Cross is different from the 119 type in that it can add two pipes to an already completed system.
123 Galvanized Railing Fittings 40 to 70 Elbow is very easy to use and can be used in any scenario where two pipes need to be connected at an angle of 40 degree to 70 degree. We have a complete supply chain and provide QA services.
124 type Galvanized Key Clamp Fitting uses 3 types of hot-dip galvanizing, double coating, and powder coating. We can provide 33.7mm, 42.4mm and 48.3mm diameters. We integrate a complete supply chain and a professional team to provide better products and services. Looking forward to your inquiry.
We can provide 21.3 mm to 60.3 mm size, that is, 1/2" to 2". We have a full range of molds, can complete each order faster.
Safety rail fittings are slip-on pipe fittings for safety railings. They can be quickly installed to complete a system, are easy to operate, and have a longer life and better performance. The 125R reducing 90-degree elbow is a special and uncommon fitting used to connect two pipes of different thicknesses.
As a top metalworking service provider, we want to let every customer experience a sense of security in purchasing, sales, etc., and better realize their value through continuously defining new standards for products and services.
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