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| For this wholesale custom 4.25" V-band clamp, we use AISI-grade stainless steel with a precision-formed V-profile, providing uniform circumferential clamping force and reliable sealing performance. It is designed for flanges with a 108 mm ID, with a band width and thickness of 22 × 1 mm. The clamp is suitable for exhaust connections on heavy-duty applications such as high-power truck diesel engines of the same size, allowing for quick installation and easy disassembly during maintenance. We support custom sizes and structural variations, and can supply matching flange components as needed. For other applications or customization requirements, please feel free to contact us. | |||||||||
This 4.25 inch (108 mm) ID high-performance V-band clamp is designed for efficient connection and sealing in large-scale power systems. It is widely used at turbocharger outlets, large-diameter exhaust manifolds, as well as in industrial generator sets and marine engines.
In heavy-duty diesel platforms and high-performance builds, the 4.25" size is a common standard, suitable for turbo outlets (downpipes) such as BorgWarner S400 series (e.g., S475, S480) and Garrett GT45/GTX45 units. It is also widely applied in exhaust aftertreatment systems for engines like Cummins ISX/QSX15, Caterpillar C15/C18, and Detroit Diesel DD15. In performance applications, this size is often used in large single-turbo setups for high-output builds such as Supra (2JZ) and GT-R (VR38).
As a direct manufacturer of exhaust system components, we operate a production facility covering over 20,000 square meters, with products exported to more than 100 countries and regions. The entire process—from raw material sourcing and tooling development to stamping, high-frequency welding, polishing, and pressure testing—is completed in-house to ensure consistent quality, dimensional control, and performance across batches.
In terms of production capacity, our facility is equipped with automated CNC stamping lines and welding systems, with stable inventory for standard sizes to support bulk orders. Beyond the standard 4.25" specification, we offer full-range customization from 1.5" to 6" V Band Clamp, with flexible options based on application requirements. Material options include SS304, SS316, and SS321, while structural variations cover standard T-bolt, quick-release, and safety pin designs. Matching male/female flanges are also available to ensure proper alignment and leak-free sealing after welding. Additional parameters such as band width, thickness, bolt grade, and surface treatment can be adjusted to meet different operating conditions.
As a direct manufacturer with over 30 years of focus on exhaust system components, our strength lies in supply chain reliability and process control. All clamp products are produced under the IATF 16949 system, from raw material spectrographic analysis to final cold-forming, ensuring full-process consistency. The V-profile diameter tolerance is strictly controlled within ±0.05 mm. By eliminating intermediary costs, we are able to return 15%–25% cost advantages to our partners. Each shipment includes full Material Test Reports (MTR) to support compliance in high-standard markets. In addition, we offer flexible laser logo marking and private label services to help you build product differentiation in performance and industrial markets.
To extend the service life of the clamp and protect the fasteners, we recommend applying a small amount of anti-seize compound to the nut during installation. This helps prevent thread galling under high temperatures and ensures smooth disassembly even after repeated use.
The standard SS304 material can withstand exhaust temperatures up to approximately 800°C. The V-band design has been tested under pressure fluctuations to ensure leak-free performance in high backpressure environments such as heavy-duty diesel systems.
