Introduction
CF to NPT Adapters are essential vacuum interface components designed to connect ConFlat® (CF) flanges with National Pipe Thread (NPT) fittings. They enable seamless integration between ultra-high vacuum (UHV) hardware and conventional piping or instrumentation, making them indispensable in research laboratories, semiconductor processing, thin-film deposition systems, and industrial vacuum setups. By bridging two widely used connection standards, these adapters simplify system design while maintaining reliable sealing performance.
Detailed Description
CF to NPT Adapters feature a precision-machined CF flange on one side and a male or female NPT thread on the other. The CF side employs a knife-edge sealing surface intended for use with oxygen-free copper gaskets, ensuring leak-tight performance under high and ultra-high vacuum conditions. The NPT side follows standardized taper thread geometry, allowing secure connection to pressure gauges, valves, pumps, or gas lines commonly found in industrial environments.
Manufactured typically from high-grade stainless steel (304L or 316L), these adapters offer excellent corrosion resistance, mechanical strength, and thermal stability. Tight dimensional tolerances and smooth surface finishes help reduce virtual leaks and particle generation—critical factors in clean vacuum systems. Various CF sizes (e.g., DN16CF, DN40CF, DN63CF) can be combined with common NPT thread sizes (1/8″, 1/4″, 1/2″, 3/4″), supporting both compact laboratory setups and larger process tools.
Applications
CF to NPT Adapters are widely used across multiple vacuum-related fields, including:
Thin film deposition systems (sputtering, evaporation, ALD, CVD)
Semiconductor and microelectronics fabrication
Vacuum measurement and instrumentation (connecting gauges, transducers)
Research and development laboratories
Industrial vacuum lines and process integration
Gas inlet or exhaust connections in UHV chambers
Their versatility allows engineers and researchers to integrate legacy NPT-based components into modern CF-based vacuum systems without redesigning the entire setup.
Technical Parameters
| Parameter | Typical Value / Range | Importance |
|---|---|---|
| CF Flange Size | DN16 – DN100 (custom available) | Ensures compatibility with vacuum chambers |
| NPT Thread Size | 1/8″ – 3/4″ NPT | Matches common industrial fittings |
| Material | 304L / 316L Stainless Steel | Corrosion resistance and vacuum compatibility |
| Sealing Method (CF side) | Copper gasket, knife-edge seal | Achieves UHV leak-tight performance |
| Surface Finish | Machined, cleaned for vacuum use | Reduces outgassing and contamination |
Comparison with Related Adapters
| Adapter Type | Key Advantage | Typical Application |
|---|---|---|
| CF to NPT Adapter | Bridges UHV and industrial piping | Vacuum systems with mixed standards |
| CF to KF Adapter | Quick-connect flexibility | Frequent assembly/disassembly |
| CF to ISO Adapter | Large-diameter vacuum transfer | High-throughput process chambers |
FAQ
| Question | Answer |
|---|---|
| Can CF to NPT Adapters be customized? | Yes, CF size, NPT thread type, material grade, and length can be customized. |
| Are these adapters suitable for UHV? | Yes, when used with proper copper gaskets on the CF side. |
| Do you offer male and female NPT options? | Both male and female NPT configurations are available. |
| How are the adapters cleaned and packaged? | Vacuum-cleaned, individually packed, and sealed to prevent contamination. |
| Which industries use them most? | Semiconductor, optics, aerospace, energy, and R&D laboratories. |
Packaging
Our CF to NPT Adapters are meticulously tagged and labeled externally to ensure efficient identification and strict quality control. Each adapter is carefully protected to prevent surface damage during storage and transportation, ensuring it arrives in excellent condition ready for immediate installation.
Conclusion
CF to NPT Adapters provide a reliable, precise, and cost-effective solution for connecting UHV CF flanges with standard NPT piping and instruments. With robust materials, accurate machining, and flexible customization options, they support demanding vacuum applications across research and industry.
For detailed specifications and a quotation, please contact us at sales@thinfilmmaterials.com.
Ordering Table
| Flange Size/OD | Fitting | Part Number |
| DN16CF (1.33" OD) | 1/8" NPT | F0133XFNPT2 |
| DN16CF (1.33" OD) | 1/4" NPT | F0133XFNPT4 |
| DN35CF-DN40CF (2.75" OD) | 1/8" NPT | F0275XFNPT2 |
| DN35CF-DN40CF (2.75" OD) | 1/4" NPT | F0275XFNPT4 |
| DN35CF-DN40CF (2.75" OD) | 1/8" NPT 1 x Radial | DFF275X1NPT |
| DN35CF-DN40CF (2.75" OD) | 1/8" NPT 2 x Radial | DFF2752NPT18 |
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