Exhaust Flex Pipe
Welcome to Yueding Exhaust Solutions! We are a dedicated enterprise providing high-quality Exhaust Flex Pipe products, offering reliable one-stop custom flex pipe solutions and soft pipe wholesale services for automotive and industrial exhaust systems. Free Samples Available for Bulk Orders！
What is the Stainless Steel Flex Pipe Exhaust ?
Exhaust flexible pipe is a key component in automotive and industrial exhaust pipe connection systems, designed to absorb vibration, compensate thermal expansion, and reduce stress on other exhaust pipe components. We provide standard universal exhaust flexible pipe, as well as upgraded structures such as interlock liner, inner braided mesh liner, fine mesh braided outer, and extended welded pipe types. In addition, we also supply long interlock hoses, braided hoses, exhaust bellows, and exhaust pipe clamps such as V-band flange clamps and U-bolt clamps. These exhaust flexible pipe components can widely solve exhaust flexible connection issues for passenger vehicles, trucks, marine vessels, construction machinery, and various industrial pipelines.
Flex Joint Exhaust Pipe Product
Exhaust Flex Couplings of Various Structures
YDCT manufacture flexible stainless steel pipe with distinct inner liner designs to meet specific NVH (Noise, Vibration, and Harshness) requirements.
Base Construction (Standard Single Braid)
Structure: High-grade Bellows + Outer Braid + K2 Cap
Feature: This is the foundational design for vibration isolation. It features a robust K2 cap that secures the outer braid to the bellows.
Best For: Economic replacement solutions where basic vibration damping is required without the need for internal flow liners.
With Inner Braid (Noise Reduction)
Structure: Base Structure + Inner Braid
Feature: Engineered with a stainless steel inner wire braid. This additional layer significantly improves noise elimination functionality by smoothing exhaust gas flow and reducing turbulence.
Best For: Passenger vehicles requiring a quieter ride and protection for the bellows against exhaust pulses.
With Interlock (High-Temperature)
Structure: Base Structure + Interlock Liner + K1 Cap
Feature: This premium design utilizes a K1 cap and a flexible metal interlock hose. The interlock structure enhances resistance to higher temperatures and significantly increases the pipe's overall tensile strength.
Best For: High-performance engines, turbocharged applications, and commercial trucks where extending component lifespan is critical.
With Nipple (Enhanced Installation)
Structure: Available for all types + Extension Nipples.
Feature: Includes pre-welded nipples (extension tubes) on both ends. This configuration retains all the performance features of the base, inner braid, or interlock models but adds better welding capability.
Best For: Repair shops and assembly lines looking for a "ready-to-install" solution that simplifies the connection to existing exhaust piping.
Common Material Specifications for Automotive exhaust flexi
Automotive exhaust flexi are available in standard diameters ranging from 1 1/2 inch to 5 inch and larger, covering both passenger and high-flow exhaust systems. Across different sizes, material structure and forming methods remain consistent to maintain predictable flexibility and durability.
Material Selection (Steel Grades)
SS304 (Standard): The industry standard for exhaust bellows. Offers excellent corrosion resistance and high toughness.
SS316L (Premium): Features low carbon content and superior resistance to corrosion, ideal for marine environments or premium automotive applications.
SS321 (High Temp): A stabilized stainless steel capable of withstanding extreme temperatures (800°F - 1500°F), offering higher creep strength than SS304.
SS409 / Aluminized Steel: Commonly used for collars and extension pipes to match standard exhaust tubing cost-effectively.
Exhaust Flex Pipe Standard Size Reference Table
Choose from our wide selection of standard sizes or request a custom dimension. All part numbers listed below are IATF 16949 certified and ready for bulk ordering.
Part Number
Inlet Diameter (Inch)
Length (Inch)
Part Number
Inlet Diameter (Inch)
Length (Inch)
YD17504
1 3/4"
4"
YD22512
2 1/4"
12"
YD17506
1 3/4"
6"
YD25004
2 1/2"
4"
YD17508
1 3/4"
8"
YD25006
2 1/2"
6"
YD17509
1 3/4"
9"
YD25008
2 1/2"
8"
YD17510
1 3/4"
10"
YD25009
2 1/2"
9"
YD17511
1 3/4"
11"
YD25010
2 1/2"
10"
YD17512
1 3/4"
12"
YD25011
2 1/2"
11"
YD20004
2"
4"
YD30004
3"
4"
YD20006
2"
6"
YD30006
3"
6"
YD20008
2"
8"
YD30008
3"
8"
YD20009
2"
9"
YD30010
3"
10"
YD20010
2"
10"
YD30012
3"
12"
YD20011
2"
11"
YD35006
3.5"
6"
YD20012
2"
12"
YD35008
3.5"
8"
YD22504
2 1/4"
4"
YD35010
3.5"
10"
YD22506
2 1/4"
6"
YD35012
3.5"
12"
YD22508
2 1/4"
8"
YD40008
4"
8"
YD22509
2 1/4"
9"
YD40010
4"
10"
YD22510
2 1/4"
10"
YD40012
4"
12"
YD22511
2 1/4"
11"
Professional Flexible Exhaust Pipe Manufacturer
Why do global wholesalers and exhaust system manufacturers choose YDCT? Because we are not a trading company—we are a source factory controlling every step of production.
In-House Manufacturing
Our facility is equipped with advanced machinery, including hydraulic metallic hose making machines (DN32-DN350) and high-speed wire braiding machines (24-156 spindle). This ensures consistent wall thickness and braid tension.
Rigorous Quality Control
We adhere to IATF 16949 standards. Every batch undergoes: 100% Air Tightness Testing.Salt Spray Testing for corrosion resistance.Fatigue Lifecycle Analysis.
Global Reach
We successfully export to Russia, Australia, Brazil, the USA, and Europe, understanding the specific quality demands of each region.
OEM/ODM Capabilities
Need a custom logo or specific box design? We offer laser marking and custom packaging. Plus, our tooling team can develop custom molds in as little as 15 days.
Contact Us
Have questions or need a custom solution? Our team at Yueding Exhaust Solutions is ready to assist you with high-quality Exhaust Flex Pipe products, custom soft pipe requirements, and soft pipe wholesale inquiries. Get in touch today for expert advice and fast, reliable support.
Applications of Flexible Exhaust Pipe Connector
Automotive Aftermarket
Trusted by repair chains and distributors, our OEM exhaust system parts include direct-fit exhaust flex pipes, OE-spec clamps, and truck exhaust connectors wholesale, providing reliable performance and easy installation for a wide range of vehicles.
Petroleum Industry
We deliver corrosion-resistant exhaust flanges and high-temperature exhaust clamps engineered for harsh oilfield environments. Our API-compliant stainless steel exhaust pipes ensure long-lasting durability under extreme conditions.
Chemical Industry
For chemical processing plants, our exhaust system flex pipes and marine-grade exhaust components resist aggressive solvents and chlorinated compounds, ensuring safe and efficient operation.
Power Generation
Optimizing turbine exhaust efficiency, our heavy-duty exhaust system components include custom pipe connectors and corrosion-resistant compensators for coal- and gas-fired plants, delivering reliable performance and extended service life.
Installation Tips
The "Natural Lie" Rule
Never install a flex pipe in a fully compressed or fully extended state. It should be installed in its "natural lie" (midway position) to allow for movement in both directions.
Correct Measurement
When cutting out an old pipe, measure the gap and add 3 inches (1.5" overlap per side) to determine the correct flex pipe length.
Welding vs. Clamping
While strap band clamps are suitable for Nipple-type pipes, MIG welding is recommended for standard flex pipes to ensure a hermetic seal and structural integrity.
Flexible Auto Exhaust Pipe Catalogue File Download
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FAQs
Q1: Can we request specific diameters and end types?
Yes. We offer full customization for diameter, length, braid type, and connection method to meet your installation requirements.
Q2: How does mesh braid compare to regular braid in lifespan?
Mesh braid may offer slightly lower durability under abrasive conditions but compensates with better flexibility and ease of fitment.
Q3: Can I order these in bulk for OEM supply?
Absolutely. We serve global OEM and aftermarket customers with stable lead times and competitive pricing.
Q4: Are these pipes tested before shipping?
Yes, all flex pipes undergo pressure and leak testing to ensure performance and safety.
Q5: What is the main difference between Interlock and Inner Braid flex pipes?
Inner Braid is cost-effective and protects the bellows from gas scour, suitable for standard cars. Interlock uses a robust metal hose liner that is more durable against high heat and vibration, making it ideal for heavy-duty and turbo applications.
Related Blogs
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Main function of stainless steel flex pipeIn real exhaust systems, stainless steel flex pipe is usually not for changing exhaust performance, but is used to deal with a long-existing but often ignored problem, that is the inevitable relative movement between the engine and the exhaust pipe. -
4 inch and 5 inch stainless steel exhaust flex pipe are mainly used in diesel engines, trucks, and high-flow exhaust systems. With interlock liner and 304 stainless steel material, these flex pipes are suitable for OEM supply, replacement projects, and bulk purchasing. -
2 inch and 2 1/2 stainless steel flex exhaust pipe are widely used in OEM and bulk supply projects. From front-section small engines to mid-section long vehicles, these standard sizes ensure installation stability, vibration absorption, and consistent performance for maintenance and large-scale supply. -
An exhaust flex coupler is a small part, but it has a big job. Its price is low, but the labor cost to replace it is high. Choosing the right technical spec—rather than the cheapest price—prevents repeated repairs and extra downtime. When you treat the selection as a technical decision, you ensure the long-term health of the entire exhaust system. -
Did you know that a small component in your car’s exhaust system could prevent costly damage? The flexi pipe exhaust plays a vital role in maintaining your vehicle’s performance. Without it, your exhaust system could suffer from cracks and leaks. -
Interlock flex pipes are not a mandatory choice for every exhaust system, but in scenarios with higher requirements for reliability and service life, they are often a more conservative and stable option. -
In summary, choose exhaust flex pipe not only look diameter. 2.5 inch exhaust flex pipe and 4 inch flex pipe exhaust difference not only number. You need look material, bellows structure, braid, expansion joint, nipple, cap and install environment. -
Some connectors have built-in fixing, easy to install, while others do not, so you need to select proper fixing method according to pipe diameter, material and usage, for example clamps or welding. Wrong fastening can cause pipe loosen, leak, or noise, and make maintenance more difficult.
Keep In Touch With Us
Partner with YDCT for factory-direct pricing, consistent quality, and reliable delivery. Whether you need standard replacements or custom OEM components, we have the capacity to meet your demands.
Mob：+86-13757770601
E-mail：mike@yuedingexhaust.com
