Introduction
KF (QF) HV 6-Way Crosses are versatile vacuum fittings designed to create multiple orthogonal connections within a compact footprint. By providing six standardized KF/QF ports, these crosses enable efficient routing, diagnostics integration, and modular expansion in high-vacuum (HV) systems. They are widely used in research laboratories, semiconductor tools, and industrial vacuum assemblies where flexibility and clean sealing are essential.
Detailed Description
Manufactured to KF/QF (also known as NW) standards, 6-way crosses allow rapid system configuration using clamps, centering rings, and elastomer O-rings—no bolting required. The geometry supports balanced conductance and minimizes dead volumes, making it suitable for pumping lines, gauge ports, and process branches.
Typically produced from vacuum-grade stainless steel (304 or 316L), these crosses feature smooth internal surfaces to reduce particle generation and outgassing. Precision machining ensures concentricity and reliable O-ring compression across all ports, enabling repeatable assembly and maintenance. Optional electropolishing further enhances cleanliness for sensitive processes.
Key advantages include:
Six orthogonal KF ports for maximum connectivity
Quick, tool-light assembly and disassembly
Low outgassing and corrosion resistance
Excellent interchangeability with standard KF hardware
Applications
High-vacuum manifolds and distribution nodes
Thin film deposition systems (PVD, sputtering, evaporation)
Semiconductor R&D tools and load-lock interfaces
Analytical instruments (gauges, mass spectrometers)
Vacuum test stands and experimental setups
Technical Parameters
| Parameter | Typical Value / Range | Importance |
|---|---|---|
| Material | Stainless Steel 304 / 316L | Durability, low outgassing |
| Standard Sizes | KF16, KF25, KF40 (others on request) | Matches common HV lines |
| Connection Type | KF (QF / NW) | Fast clamp-based sealing |
| Sealing Method | Elastomer O-ring with centering ring | Reliable HV seal |
| Surface Finish | Machined / Electropolished (optional) | Cleanliness & particle control |
| Vacuum Range | Up to ~10⁻⁷ mbar (typical) | Suitable for HV systems |
Comparison with Related Fittings
| Fitting Type | Key Advantage | Typical Application |
|---|---|---|
| KF (QF) HV 6-Way Cross | Maximum connectivity in compact space | Manifolds & diagnostics |
| KF Tee | Simple branch connection | Basic line splitting |
| CF Cross | Metal gasket, UHV capability | Ultra-high-vacuum systems |
FAQ
| Question | Answer |
|---|---|
| Are KF, QF, and NW interchangeable? | Yes, they refer to the same standardized flange system. |
| Can different port sizes be combined? | Mixed-size configurations can be customized on request. |
| Is this suitable for UHV applications? | Primarily for HV; CF fittings are recommended for UHV. |
| What O-ring materials are available? | Viton® is standard; alternatives may be available. |
| How are the crosses cleaned and packed? | Cleaned for vacuum service and individually packed. |
Packaging
Our KF (QF) HV 6-Way Crosses are cleaned, capped on sealing faces, and individually packed. Protective foam and export-grade cartons are used to prevent damage and contamination during storage and transportation.
Conclusion
KF (QF) HV 6-Way Crosses provide a compact, modular solution for building complex high-vacuum manifolds with minimal downtime. Their standardized design, robust materials, and ease of assembly make them an excellent choice for both research and industrial vacuum systems.
For detailed specifications and a quotation, please contact us at sales@thinfilmmaterials.com.
Ordering Table
| Flange Size/OD | Type | Flange Material | Drawing | Nominal Tube OD | Wall Thickness | Part Number |
| KF16 (1.18" OD) | Cross, 6-Way | 304L SS |
| 3/4 | 0.065 | QF16-075-6X |
| KF25 (1.57" OD) | Cross, 6-Way | 304L SS |
| 1 | 0.065 | QF25-100-6X |
| KF40 (2.16" OD) | Cross, 6-Way | 304L SS |
| 1-1/2 | 0.065 | QF40-150-6X |
| KF50 (2.95" OD) | Cross, 6-Way | 304L SS |
| 2 | 0.065 | QF50-200-6X |
Accessories Table
| Description | For | Per Package | Part Number |
| Cast Clamps (SS) | KF10, KF16 Flanges | 1 | QF16-075-CS |
| Cast Clamps (SS) | KF25 Flanges | 1 | QF25-100-CS |
| Cast Clamps (SS) | KF40 Flanges | 1 | QF40-150-CS |
| Cast Clamps (SS) | KF50 Flanges | 1 | QF50-200-CS |
| Cast Clamps (Aluminum) | KF10, KF16 Flanges | 1 | QF16-075-C |
| Cast Clamps (Aluminum) | KF25 Flanges | 1 | QF25-100-C |
| Cast Clamps (Aluminum) | KF40 Flanges | 1 | QF40-150-C |
| Cast Clamps (Aluminum) | KF50 Flanges | 1 | QF50-200-C |
| Lever Clamps (Aluminum) | KF10, KF16 Flanges | 1 | QF16-075-CHA |
| Lever Clamps (Aluminum) | KF25 Flanges | 1 | QF25-100-CHA |
| Lever Clamps (Aluminum) | KF40 Flanges | 1 | QF40-150-CHA |
| Centering Ring (SS with Fluorocarbon O-Ring) | KF10 Flanges | 1 | QF10-050-SRV |
| Centering Ring (SS with Fluorocarbon O-Ring) | KF16 Flanges | 1 | QF16-075-SRV |
| Centering Ring (SS with Fluorocarbon O-Ring) | KF25 Flanges | 1 | QF25-100-SRV |
| Centering Ring (SS with Fluorocarbon O-Ring) | KF40 Flanges | 1 | QF40-150-SRV |
| Centering Ring (SS with Fluorocarbon O-Ring) | KF50 Flanges | 1 | QF50-200-SRV |
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