Our SS304 KF Vacuum Weld Ring is a precision-engineered, dual-purpose component purpose-built for ISO-KF (NW/QF) high-vacuum piping systems. Designed to streamline installation while ensuring long-term vacuum integrity, it serves as both a welding alignment fixture and a permanent, quick-disconnect flange interface.
Our SS304 KF Vacuum Weld Ring (also known as KF stub weld flange) is a precision-machined component designed for high-vacuum piping systems, combining accurate alignment during welding with a standardized, quick-disconnect KF interface.
Manufactured from durable 304 stainless steel, it offers excellent corrosion resistance, compatibility with bake-out processes up to 200°C. The press-fit inner bore ensures precise alignment with vacuum tubing during welding, preventing deformation, burn-through, and misalignment to guarantee full-penetration, leak-tight welds.
The flange end features a standard ISO-KF groove design, compatible with all industry-standard KF clamps, centering rings, and O-rings, enabling fast, tool-free assembly and disassembly for maintenance or cleaning. Available in common sizes including KF16, KF25, KF40, and KF50, this weld ring is widely used in semiconductor manufacturing, laboratory equipment, pharmaceutical processing, and industrial vacuum systems.
It serves as both a welding alignment tool and a permanent vacuum connection, reducing installation errors, lowering on-site rework rates, and ensuring consistent, long-term vacuum integrity.
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Production Name |
SS304 KF Vacuum Weld Ring |
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Material Capabilities |
Customized |
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Brand |
LIONSE |
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Surface Treatment |
As customer’s requirements |
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Origin |
Qingdao, China |
Key Features
LIONSE has established a well-deserved reputation in the CNC machining industry for quality, reliability, cost-effectiveness and timely delivery. To meet your expectations for your projects, our team of mechanics and engineers will work closely together throughout all stages of product development, from prototype to production. We recognize that each project and its application are unique, so we offer each customer a distinctive yet practical solution, including precision machining services and custom surface treatments. Contact us today and let us start creating your parts.
Q1: what products is your company producing?
For over 15 years, LIONSE is a worldwide supplier in the distribution of titanium products, metal working and bearings. The industries we serve is including surgical implants & tools, automotive parts, chemical devices, power generation, mine equipments, aircraft, pumps etc. LIONSE is your reliable supplier.
Q2:How does your company control the products' quality?
Well, as we all know that quality comes first during the business with our customers we always persist in the "Quality is the life of enterprise. we are using the first confirmed cases, production inspection, and packaging seized the entire combination to control product quality strictly.
Q3:Why Choose Our KF Weld Rings?
By combining welding alignment and permanent connection into one component, our KF weld rings simplify installation workflows, reduce costs, and deliver consistent performance. Whether you are building a new vacuum system or upgrading an existing line, they offer a reliable, cost-effective solution that meets the strictest standards for vacuum piping.
Q4:Typical applications of SS304 KF Vacuum Weld Ring
Our SS304 KF Vacuum Weld Rings are widely trusted across industries where vacuum integrity and easy maintenance are critical:
Semiconductor manufacturing equipment
Laboratory and research vacuum systems
Pharmaceutical and food processing vacuum lines
Industrial vacuum coating and processing machinery
Analytical instrumentation and test chambers
