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RUBefore shipping, we conduct visual and functional checks to confirm product surface, coating quality, and assembly accuracy. Only products that meet standards are packed and delivered.
1. Higher Standard Products
2. Shorter Production Cycle
3. More Corrosion Resistant
4. More Optional Delivery Methods
5. Comprehensive After Service
Plug Structural Pipe Fittings are used to close and protect pipe ends in railing systems. They prevent corrosion inside pipes, enhance safety, and provide a clean, finished appearance. HULK Metal offers customizable materials, sizes, and surface treatments for diverse applications.
Our Plug Structural Pipe Fittings are manufactured with malleable iron, ductile iron, or customized materials to meet different project requirements. Multiple surface treatments such as galvanizing or powder coating ensure durability and corrosion resistance. Standard sizes fit common tubes ranging from 26.9 mm to 60.3 mm, with customization available. Each product is precisely designed and tested to ensure secure fitting, reliable sealing, and long-lasting performance in various structural systems.
| 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 | 184 Plug Structural 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 |
| A | 20 | 3/4" | 26.9 | HM-G-184-A | HM-D-184-A | HM-PC-184-A | HM-B-184-A | 27.5 | |||
| B | 25 | 1" | 33.7 | HM-G-184-B | HM-D-184-B | HM-PC-184-B | HM-B-184-B | 26.5 | |||
| C | 32 | 5/4" | 42.4 | HM-G-184-C | HM-D-184-C | HM-PC-184-C | HM-B-184-C | 29.4 | |||
| D | 40 | 3/2" | 48.3 | HM-G-184-D | HM-D-184-D | HM-PC-184-D | HM-B-184-D | 28 | |||
| E | 50 | 2" | 60.3 | HM-G-184-E | HM-D-184-E | HM-PC-184-E | HM-B-184-E | 38 | |||
HULK Metal provides Plug Structural Pipe Fittings engineered to protect pipe ends and enhance the safety of railing systems. These fittings prevent accidents by sealing sharp edges while stopping moisture and debris from entering pipes, reducing corrosion risk. Our plugs are manufactured with precision, using high-grade materials and advanced surface treatments. Each product is tested for durability, ensuring a secure fit, smooth finish, and long service life in multiple applications.
A Plug Structural Pipe Fitting is a component used at the end of handrails, guardrails, and other railing or DIY structures to close and protect the pipe. Its primary function is to safeguard users from accidental injury and prevent internal rusting or contamination of the pipe system.
The plug is designed with a head diameter equal to or slightly larger than the pipe's outside diameter. The surface is smooth and rounded, providing a safe and comfortable touch while avoiding scratches during use. Inside, the plug features a gripping structure that locks firmly into the inner wall of the pipe, ensuring that it does not loosen or fall out during operation.
These fittings are commonly used in industrial, commercial, and residential railing systems, where both safety and aesthetics matter. In addition to practical protection, plugs also improve the overall appearance of the system by creating a clean and finished end. With customizable sizes, materials, and finishes, HULK Metal's Plug Structural Pipe Fittings can be tailored to meet the requirements of diverse projects and environments, ensuring consistent performance, corrosion resistance, and long-lasting safety.
We manufacture Plug Structural Pipe Fittings in cast iron, stainless steel, and aluminum to provide durable solutions for various applications.
Cast iron plug fittings are strong, durable, and cost-effective. They provide excellent mechanical strength and are suitable for most industrial railing applications. With surface treatments like galvanizing, they resist corrosion and extend service life. Cast iron is the most commonly used material for structural pipe fittings, making it a practical choice for heavy-duty projects.
Stainless steel plug fittings offer excellent corrosion resistance, especially in outdoor or marine environments. They provide a polished, professional appearance while ensuring long-lasting strength. Stainless steel is ideal for projects where durability and aesthetics are equally important. Though higher in cost, its resistance to rust and minimal maintenance needs make it an excellent option for premium railing systems.
Aluminum plug fittings are lightweight yet strong, making them easy to handle and install. They provide good corrosion resistance and are suitable for environments where reducing system weight is critical. Aluminum is also recyclable, making it an eco-friendly choice. These fittings are ideal for architectural and decorative applications where both performance and appearance matter.
We provide multiple surface treatments to enhance durability, corrosion resistance, and appearance, suitable for different environments and customer requirements.
Hot-dip galvanizing involves immersing the plug fitting in molten zinc to create a thick, durable coating. This process provides strong protection against rust and is ideal for outdoor applications exposed to rain, humidity, or corrosive environments. The coating forms a metallurgical bond with the base material, ensuring long-lasting adhesion. Hot-dip galvanized plugs are widely used in industrial facilities, public railings, and safety barriers where long-term corrosion protection is essential.
Double-coating galvanizing builds on hot-dip galvanizing by adding an extra electro-galvanized layer, creating superior resistance against corrosion. The additional coating enhances surface smoothness, making the plug more visually appealing while strengthening durability. This method is ideal for railing systems used in coastal areas, humid regions, or chemical facilities where higher resistance is needed. It ensures both functional and aesthetic benefits, providing extended service life even under challenging environmental conditions.
Powder coating uses an electrostatic process to apply a protective and decorative finish to the plug. It allows a wide choice of colors, making it suitable for architectural projects where visual design is important. Besides improving appearance, powder coating enhances surface hardness, weather resistance, and wear resistance. It is particularly effective for indoor or outdoor decorative railing systems, helping customers achieve both safety and style.
Confirm the plug size matches the system requirements.
Ensure surface treatment suits the intended environment.
Check compliance with local railing installation standards.
A: We operate a fully equipped quality inspection center with advanced testing equipment. Rigorous procedures ensure every Plug Structural Pipe Fitting meets ISO 9001 standards. From raw material inspection to final testing, our system guarantees consistent and reliable quality.
A: Our prices are based on high-quality standards. For the same quality, we offer more competitive pricing. Larger orders benefit from better cost savings. Contact our sales team for tailored quotations based on your quantity and material requirements.
A: The MOQ varies depending on size and material. For standard cast iron plugs, the MOQ is usually low. For customized stainless steel or aluminum fittings, the MOQ may be higher. Contact us to discuss your specific order.
A: Delivery time depends on the order and customization. Generally, standard products ship within 30 days. Larger or special orders may take up to 45 days. We optimize production schedules to ensure faster lead times without compromising quality.
A: We provide hot-dip galvanizing, double-coating galvanizing, and powder coating. Customized color options for powder coating are also available but may require a minimum order quantity. Each finish is designed to match specific environments and durability requirements.
A: HULK Metal ships globally, with customers in over 50 countries, including Europe, North America, South America, Africa, and Southeast Asia. We provide multiple logistics solutions to ensure safe, fast, and cost-effective delivery to your region.
A: We manufacture fittings in cast iron, stainless steel, and aluminum. Currently, full mold sets are available for cast iron. Stainless steel and aluminum production requires mold development or OEM cooperation. We can provide solutions based on your needs.
A: Standard sizes cover tube diameters from 26.9 mm to 60.3 mm. Customized dimensions can be developed according to project drawings or requirements. Our technical team will recommend the best plug size to ensure perfect fit and performance.
A: Check the supplier's production capacity, quality certification, and surface treatment options. Evaluate their after-sales service and delivery speed. Reliable suppliers like HULK Metal provide complete technical support, transparent pricing, and strict quality inspection to reduce risks.
A: We accept multiple payment methods, including T/T and L/C. Delivery terms such as FOB, CIF, and DDP are available. We can also customize freight routes and offer free warehousing services to meet your logistics needs.
HULK Metal follows a strict quality control system to ensure every Plug Structural Pipe Fitting meets international standards. From raw materials to finished products, all steps are inspected with precision equipment. Our ISO 9001 certified processes guarantee dimensional accuracy, durability, and corrosion resistance. By combining advanced testing methods and professional QC staff, we ensure that customers receive reliable, consistent, and high-quality products for any structural or railing application.
Before shipping, we conduct visual and functional checks to confirm product surface, coating quality, and assembly accuracy. Only products that meet standards are packed and delivered.
Each plug is measured with advanced tools to confirm exact dimensions. This ensures a precise fit with pipes, avoiding installation problems and guaranteeing stable performance in structural systems.
Random samples are tested in simulated environments to verify performance, durability, and safety. This inspection ensures the plug remains securely fixed and functional under different working conditions.
Strict counting procedures and barcode systems are applied to verify order quantities. This ensures that customers always receive the exact number of products ordered without errors.
HULK Metal's factory integrates casting, machining, surface treatment, and quality control under one roof. With modern equipment and experienced staff, we provide efficient large-scale production while meeting diverse customization requirements. Our streamlined workflow reduces lead time while maintaining strict quality standards. By combining technology with management expertise, HULK Metal ensures that every Plug Structural Pipe Fitting is delivered with consistent quality and performance, ready to serve international markets.
Choosing HULK Metal means working with a manufacturer who combines experience, efficiency, and reliability. We offer ISO-certified production, advanced surface treatments, and strict quality inspections to guarantee higher standard fittings. Our solutions are cost-effective, with flexible logistics and comprehensive after-sales support. From technical consultation to delivery, we ensure a smooth experience. Partnering with HULK Metal allows you to secure durable Plug Structural Pipe Fittings and enjoy long-term supply stability.
To help you better understand Plug Structural Pipe Fittings, we provide related articles covering product applications, installation guides, surface treatment comparisons, and project case studies. These resources showcase real-world usage, industry insights, and technical tips to support your projects. Each article is accompanied by images and practical examples, helping you evaluate which plug solution best suits your requirements. Explore these materials to gain valuable knowledge before making purchasing decisions and to optimize your railing system design.
HULK Metal manufactures a full range of structural pipe fittings beyond plugs, including elbow fittings, swivel base flanges, slope railing base flanges, T-joints, and hook fittings. Each product is designed for durability, safety, and ease of installation. Customers can choose from galvanized, powder-coated, or customized finishes to suit their projects. By offering a complete selection of components, we ensure seamless system integration, helping you build reliable and long-lasting railing or structural frameworks.
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
Malleable Iron/Ductile Iron/Customizable
Galvanized/Powder-coat/Customizable
TUBE SIZE(mm)
33.7
42.4
48.3
Customizable
Malleable Iron/Ductile Iron/Customizable
Galvanized/Powder-coat/Customizable
TUBE SIZE(mm)
26.9
33.7
42.4
48.3
48.3/42.4
60.3
21.3
Customizable
Malleable Iron/Ductile Iron/Customizable
Galvanized/Powder-coat/Customizable
TUBE SIZE(mm)
26.9
33.7
42.4
48.3
60.3
21.3
Malleable Iron/Ductile Iron/Customizable
Galvanized/Powder-coat/Customizable
TUBE SIZE(mm)
26.9
33.7
42.4
48.3
60.3
Customizable
Malleable Iron/Ductile Iron/Customizable
Galvanized/Powder-coat/Customizable
TUBE SIZE(mm)
26.9
33.7
42.4
48.3
60.3
Customizable
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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