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| We provide custom exhaust flex pipe assemblies with flanges in various sizes, covering common diameters from 2.0" (51mm) to 4.0" (102mm), including 3-bolt, 4-bolt, and square flange configurations.Customization is available for bellows length, braid structure, and flange hole patterns to meet different OEM requirements. The flanges are made of heavy-duty carbon steel for strength, and slight surface oxidation may be present, which does not affect welding performance or service life. Some models are non-standard sizes and require minimum order quantities. For bulk purchasing or technical requirements, please feel free to contact us. | |||||||||
This flanged exhaust bellows assembly is designed for demanding industrial and automotive exhaust system conditions. As a source factory of stainless steel flexible connection products, we use standard AISI 304 stainless steel raw material and strictly control material composition and batch stability, to ensure the product keeps structural stability under long-term thermal cycling. The product is made by hydraulic bellows forming, braid weaving, and end flange welding. It can effectively absorb system vibration and compensate thermal movement, reduce stress transfer, and extend the service life of the whole exhaust system.
Compared with welded or clamp connection types, the flanged connection does not require on-site welding and is easier to install. It also provides more stable sealing performance under high temperature and high pressure conditions. It is suitable for OEM applications and high-load working conditions, and helps reduce later maintenance cost. We also supply matching sealing gaskets and related components for system integration use.
Our factory is equipped with CNC stamping and machining equipment. We can customize matching flanges and exhaust flex pipe assemblies based on your drawings or technical requirements, and support fast sampling and small batch validation. For the connection between flange and bellows, we use a combination of automatic and manual TIG welding, with process control on welding parameters. This ensures uniform weld shape and stable gas tightness, meeting OEM requirements for connection reliability.
As a factory with large-scale production capacity, our monthly output of exhaust bellows can reach up to 350,000 pieces. Standard flange sizes are kept in stable stock, which supports continuous delivery for bulk orders and tight lead time requirements. In quality management, we are certified with ISO 9001, ISO 45001, and RoHS. All products can provide material certificates and inspection reports to meet compliance requirements of different markets.
Yes. We have an independent tooling development and engineering team, supporting deep customization based on your CAD, PDF, or paper drawings. Whether it is special square flanges, 3-bolt asymmetric layouts, or increasing bellows layers and adjusting inner structures (such as interlock or liner) for high-pressure conditions, we can provide a technical evaluation within 24 hours. This ensures both physical fit and performance matching with your system design.
It depends on your maintenance frequency and sealing requirements. Welded type is a permanent connection with lowest cost, but requires cutting during replacement. Clamp type relies on compression sealing, suitable for light repair or modification, but may have slight leakage under high pressure. Flanged type (this product) is commonly used in OEM systems. It uses bolt fastening with gasket to achieve high-level sealing and easy assembly/disassembly. For positions like turbo outlet or manifold joints with high pressure, high vibration, and regular maintenance needs, flanged type is the better choice to ensure long-term leak-free performance and reduce downtime cost.
Under extreme conditions, a single connection method is often not enough. Our technical support focuses on optimizing the whole assembly structure. First, we suggest suitable bellows layers (double or triple) based on your application data to improve fatigue strength. Second, for flange connection, we recommend proper torque standards during bolt tightening, together with our matching reinforced metal gaskets. With this “thick flange + multi-layer bellows” structure, the assembly can keep stable connection under medium-low frequency large vibration and sudden thermal expansion, preventing flange deformation and system leakage.
