Introduction
DN295CF (14.00″ OD) 316LN Stainless Steel Standard ConFlat® (CF) UHV Flanges are large-diameter vacuum interfaces engineered for ultra-high-vacuum (UHV) systems that demand exceptional sealing reliability, thermal stability, and structural strength. Commonly used on main chambers, high-conductance pump ports, and large experimental vessels, DN295CF flanges provide dependable metal sealing in the most demanding scientific and industrial environments.
Detailed Description
These DN295CF flanges are precision-machined from vacuum-grade 316LN stainless steel, a low-carbon, nitrogen-enhanced alloy selected for superior mechanical strength, excellent corrosion resistance, and very low outgassing rates. The accurately formed ConFlat® knife-edge geometry creates a robust metal-to-metal seal when compressed against an OFHC copper gasket, ensuring leak-tight performance suitable for UHV operation.
With a 14.00 inch (355.6 mm) outer diameter, DN295CF flanges comply fully with international CF standards, allowing direct compatibility with matching flanges, reducers, tees, and zero-length adapters. The high structural rigidity of 316LN SS makes this flange especially suitable for large ports where mechanical stability during pump-down and bakeout is critical.
Applications
Large UHV chambers and experimental vessels
High-conductance pump ports (turbo, cryo, diffusion pumps)
Semiconductor processing and deposition systems
Particle accelerators, beamlines, and fusion research
Surface science and advanced physics laboratories
Technical Parameters
| Parameter | Typical Value / Range | Importance |
|---|---|---|
| Flange Type | ConFlat® (CF), DN295 | Standard UHV interface |
| Outer Diameter | 14.00″ (355.6 mm) | Large-port compatibility |
| Material | 316LN Stainless Steel | Low outgassing, high strength |
| Sealing Method | Knife-edge with copper gasket | Proven UHV metal seal |
| Bolt Pattern | DN295CF standard | Interchangeable with CF hardware |
| Bakeout Temperature | Up to ~450 °C | UHV-ready performance |
| Leak Rate | ≤ 1×10⁻¹⁰ mbar·L/s (typical) | Maintains UHV integrity |
Comparison with Related CF Flanges
| Flange Size | Key Advantage | Typical Application |
|---|---|---|
| DN295CF (316LN SS) | Very high conductance, structural strength | Main chambers & pump ports |
| DN200CF | Compact large-port option | Medium UHV chambers |
| DN350CF | Extra-large access | Custom & research systems |
FAQ
| Question | Answer |
|---|---|
| Are copper gaskets included? | Copper gaskets are typically supplied separately unless requested. |
| Why use 316LN instead of 304L? | 316LN offers higher strength and improved performance for large flanges. |
| Is this flange suitable for repeated bakeouts? | Yes, it supports repeated high-temperature UHV bake cycles. |
| Are electropolished versions available? | Yes, electropolishing can be provided on request. |
| How are knife edges protected during shipping? | Protective caps are installed to prevent damage. |
Packaging
Our DN295CF 316LN SS Standard ConFlat® UHV Flanges are cleaned for vacuum service, with knife edges protected by caps. Each flange is individually packed using shock-absorbing materials and shipped in export-grade cartons or wooden crates to ensure safe delivery.
Conclusion
DN295CF (14.00″ OD) 316LN SS Standard ConFlat® (CF) UHV Flanges deliver exceptional sealing reliability, mechanical strength, and full compatibility with global CF standards. They are an ideal solution for large-scale UHV systems in semiconductor manufacturing, advanced research, and high-technology vacuum applications.
For detailed specifications and a quotation, please contact us at sales@thinfilmmaterials.com.
Ordering Table
| Flange Size/OD | Type | Note | Part Number |
| Fixed | — | — | F1400N000NLN |
| Fixed Tapped | — | — | F1400N000NMLN |
| Rotatable Tapped | — | — | F1400N000RMLN |
| Fixed Tapped | — | — | F1400N000TLN |
| Fixed | Fixed | F1400N1200NLN | |
| Fixed Tapped | — | — | F1400N1200TLN |
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