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RUWe check pipe fitting dimensions precisely to ensure accurate sizing and proper compatibility with pipes. This guarantees stable installation and prevents performance issues in railing or structural pipe systems.
1. Higher Standard Products
2. Shorter Production Cycle
3. More Corrosion Resistant
4. More Optional Delivery Methods
5. Comprehensive After Service
External sleeve joint pipe fittings are designed to connect two pipes in a strong and stable way. They are widely used in handrails, fences, guardrails, and DIY structures, providing durable performance with various surface finishes and precise dimensions.
The parameters of external sleeve joint structural pipe fittings cover dimensions, surface finishing, and product codes. These fittings are available in multiple pipe sizes to match different railing or structural requirements. Customers can choose from hot-dip galvanizing, double galvanizing, powder coating, or raw black finishes. Each fitting has a specific code for easy identification, ensuring you can order and manage products more efficiently for your projects.
| 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 |
| Basic Info Table of Fittings | |||||||||||
 |  | ||||||||||
| Name | 149 External Sleeve Joint | ||||||||||
| 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 |
| A | 20 | 3/4" | 26.9 | HM-G-149-A | HM-D-149-A | HM-PC-149-A | HM-B-149-A | 76 | |||
| B | 25 | 1" | 33.7 | HM-G-149-B | HM-D-149-B | HM-PC-149-B | HM-B-149-B | 89 | |||
| C | 32 | 5/4" | 42.4 | HM-G-149-C | HM-D-149-C | HM-PC-149-C | HM-B-149-C | 102 | |||
| D | 40 | 3/2" | 48.3 | HM-G-149-D | HM-D-149-D | HM-PC-149-D | HM-B-149-D | 102 | |||
| E | 50 | 2" | 60.3 | HM-G-149-E | HM-D-149-E | HM-PC-149-E | HM-B-149-E | 120 | |||
External Sleeve Joint Structural Pipe Fittings are used to extend or connect pipes in a simple and effective way. They are widely applied in guardrails, handrails, fences, and DIY structures. With reliable strength and multiple finishes, they provide strong connections that enhance durability. Designed with user-friendly installation in mind, they allow quick assembly and secure performance, making them ideal for construction projects, public infrastructure, and creative modular systems.
External Sleeve Joint Structural Pipe Fittings are types of connectors designed to join two pipes securely, typically in railing or structural pipe systems. It plays an important role in extending pipe lengths and reinforcing structures in handrails, guardrails, fences, and various DIY frameworks. The fitting is especially useful in modular construction systems where pipes need to be extended without welding or complicated tools.
Structurally, the External Sleeve Joint is a long sleeve tube fitted with two hexagon socket set screws, one at each end. These screws lock the pipes firmly inside the sleeve, ensuring a secure and stable connection. This design prevents movement or loosening during use, making it highly reliable for safety-critical applications.
Compared with other fittings, the External Sleeve Joint offers greater simplicity in installation while maintaining excellent load-bearing performance. It allows users to assemble and disassemble pipe systems quickly, making it suitable for both permanent and temporary structures. With different materials and surface treatments available, the fitting provides better adaptability to diverse environments, whether for outdoor guardrails exposed to harsh weather or indoor DIY projects requiring aesthetic finishes.
External sleeve joint pipe fittings can be produced in cast iron, stainless steel, or aluminum, each offering unique advantages.
Cast iron External Sleeve Joint fittings are produced by sand casting. They deliver strong durability and cost-effectiveness, making them a popular choice for structural pipe systems. The robust performance and affordability make them widely used in railing, guardrail, and fencing projects.
Stainless steel External Sleeve Joint fittings are produced by investment casting. They provide excellent corrosion resistance, durability, and a clean appearance. Suitable for projects requiring long-term strength and aesthetics, they are commonly used in coastal, outdoor, or industrial environments where protection is critical.
Aluminum External Sleeve Joint fittings are produced by die casting. Lightweight yet strong, they are easy to handle and install. With superior resistance to rust and attractive finishes, they are often selected for DIY structures and projects where portability is important.
Surface treatments improve durability and appearance, making the fittings suitable for different usage environments and customer requirements.
Hot-dip galvanizing forms a thick zinc coating on the surface, providing superior corrosion resistance and long-term durability. It is especially suitable for outdoor installations like railings, fences, and guardrails that face rain and harsh weather. This treatment ensures fittings maintain structural integrity and a reliable service life in demanding environments.
Double-coating galvanizing applies two layers of zinc protection, further enhancing rust resistance and lifespan compared with standard galvanizing. It is ideal for projects requiring extra durability, such as public infrastructure, heavy-duty guardrails, and industrial environments. This finish offers longer-lasting performance where fittings are exposed to continuous moisture or extreme outdoor conditions.
Powder coating provides both corrosion resistance and aesthetic value. With customizable colors, fittings can be matched to design requirements. It is suitable for indoor railings, DIY projects, and decorative fencing where appearance matters. The coating also enhances wear resistance, making it a practical choice for projects requiring both style and strength.
Ensure the pipe outer diameter matches the fitting inner diameter.
Confirm the surface treatment meets the environmental requirements.
Check compliance with local railing and installation standards.
Handrails, guardrails, and fences
DIY structures and modular systems
A: We operate a fully equipped quality inspection center with advanced instruments. Rigorous testing and a complete quality assurance system are applied to every order, ensuring that External Sleeve Joint Pipe Fittings meet international standards and deliver reliable long-term performance.
A: Our pricing is based on maintaining high quality. With the same quality level, we offer more competitive prices. Larger orders benefit from economies of scale, so purchasing in higher quantities helps reduce your overall cost while ensuring consistent quality.
A: The minimum order quantity depends on the product model and specifications. You can contact our sales team directly for an accurate quotation. We will provide a tailored solution that fits your order size and delivery requirements.
A: Delivery time depends on your order size and requirements. Generally, production and shipment take around 30 days. With larger orders, efficiency increases, but we ensure the cycle will not exceed 45 days under normal conditions.
A: We provide hot-dip galvanizing, double-coating galvanizing, and powder coating. Customized powder-coated colors can also be arranged but may require a minimum order quantity. All finishes are designed to meet different environmental and aesthetic requirements for your projects.
A: We export to over 50 countries worldwide, including Europe, North America, South America, Africa, and Southeast Asia. With strong logistics partnerships, we can arrange flexible shipping methods to meet different regional requirements and ensure smooth delivery.
Q7: What kind of materials can you use to produce structural pipe fittings? (40 words)
A: We mainly produce cast iron structural pipe fittings with a full set of molds. Stainless steel and aluminum are also available but require new mold production for OEM projects. Customers can choose materials according to strength, corrosion resistance, and budget.
A: We provide multiple sizes from DN20 to DN50, matching common railing and structural pipe dimensions. Each size has a unique code for easy ordering and management, ensuring you receive the correct products for your specific project requirements.
A: Pay attention to production quality, certification, surface treatment reliability, and after-sales service. Choosing a supplier with strong technical support, ISO 9001 certification, and consistent delivery performance ensures your project runs smoothly and achieves long-term durability.
A: We support flexible payment methods, including T/T, L/C, and negotiated terms. Delivery terms such as FOB, CIF, and DDP can be arranged according to customer preference, helping you optimize purchasing convenience and cost management.
HULK Metal carries out strict quality control throughout the production of External Sleeve Joint Structural Pipe Fittings. From raw material to finished products, every stage is inspected to ensure compliance with ISO 9001 standards. Our QC team uses advanced equipment to monitor dimensions, surface finishes, and overall durability. Multiple inspections guarantee reliable performance, helping you receive fittings with consistent quality, better longevity, and strong safety assurance.
We check pipe fitting dimensions precisely to ensure accurate sizing and proper compatibility with pipes. This guarantees stable installation and prevents performance issues in railing or structural pipe systems.
Before delivery, each batch is thoroughly examined for surface quality, coating thickness, and connection strength. This ensures customers receive defect-free products ready for installation.
Samples are tested under practical conditions to confirm performance. This process ensures each external sleeve joint fitting can withstand real usage stresses without deformation or loosening.
Every order undergoes strict quantity verification to match customer requirements. Accurate packing lists and checks prevent shortages, helping customers manage projects smoothly and without delays.
HULK Metal operates modern factories and a complete supply chain to produce External Sleeve Joint Pipe Fittings with consistent quality. From casting to surface treatment, each step is performed under strict supervision. Our advanced QC center and experienced production team guarantee precision. With large-scale capacity, we can handle bulk orders efficiently, ensuring faster lead times and delivering structural pipe fittings that meet global standards.
Choosing HULK Metal means working with a trusted supplier that offers certified quality, faster production cycles, and better corrosion resistance. We provide comprehensive technical support, reliable surface treatments, and flexible logistics services. With ISO 9001 certification and CE/TUV/GB compliance, our fittings meet international standards. Customers benefit from consistent quality, competitive prices, and responsive after-sales service, ensuring every project is supported from order placement to delivery.
In this section, you can browse articles related to external sleeve joint structural pipe fittings. The content provides technical knowledge, industry applications, and practical tips for selecting the right fittings. These articles cover topics such as railing system installation, surface treatment benefits, and comparisons of different materials. They serve as valuable references for buyers and project managers, helping you make more informed purchasing decisions while staying updated with the latest industry trends.
Besides external sleeve joints, HULK Metal supplies a wide range of structural pipe fittings, including base flanges, gate hinges, handrail brackets, railing connectors, and more. Each fitting is available with multiple surface treatments to suit different environments. With our large-scale production capacity, you can source various fittings from one supplier, ensuring consistency in quality and design. This integrated supply reduces procurement costs and simplifies project management for railing, fencing, and DIY structural systems.
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.
Malleable Iron/Ductile Iron/Customizable
Galvanized/Powder-coat/Customizable
TUBE SIZE(mm)
26.9
33.7
42.4
48.3
Customizable
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.
Malleable Iron/Ductile Iron/Customizable
Galvanized/Powder-coat/Customizable
TUBE SIZE(mm)
26.9
33.7
42.4
48.3
60.3
21.3
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.
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.
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.
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.
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.
No. 101 galvanized pipe handrail fittings are used to connect two pipes into a "T" shape. It is also called Short Tee. One pipe is inserted into the socket and the other one passes through the channel above.
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.
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.
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.
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.
123 Type Galvanized Railing Fittings is a kind of elbow that can connect two pipes with an angle of 40° to 70°. We can provide two calibers: 42.4mm and 48.3mm. We will strictly implement ISO9001 to manage the supply chain and provide better products and services.
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.
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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