Introduction
KF (QF) HV Blank Stubs (Aluminum 6061-T6) are lightweight vacuum components designed to cap or extend KF/QF (NW) ports in high-vacuum (HV) systems. They are commonly used to temporarily close unused connections, create short dead-end extensions, or protect ports during system modification and maintenance. The use of aluminum 6061-T6 offers an excellent balance of strength, corrosion resistance, and easy handling.
Detailed Description
Manufactured in accordance with standard KF/QF dimensions, aluminum blank stubs feature a short tubular section terminated with a blank end. When paired with a standard centering ring, O-ring, and clamp, they provide a reliable HV seal without permanent system changes.
Aluminum 6061-T6 is widely chosen for vacuum hardware due to its low weight, good mechanical strength, and stable machining characteristics. Compared with stainless steel stubs, aluminum versions reduce overall system mass and are easier to install or reposition—particularly beneficial for mobile frames, compact assemblies, or frequently reconfigured laboratory setups.
Key features include:
Precision-machined KF sealing face for uniform O-ring compression
Lightweight construction for easy handling
Smooth internal and external surfaces to reduce particle generation
Full compatibility with standard KF clamps and centering rings
Applications
Capping unused KF/QF ports in HV systems
Temporary isolation during system maintenance
Short extensions or dead-end terminations in vacuum lines
Semiconductor and thin film deposition tools
Laboratory vacuum manifolds and test setups
Technical Parameters
| Parameter | Typical Value / Range | Importance |
|---|---|---|
| Material | Aluminum 6061-T6 | Lightweight, corrosion resistant |
| Standard Sizes | KF10, KF16, KF25, KF40, KF50 | Matches common KF ports |
| Connection Type | KF (QF / NW) | Standard clamp-based interface |
| Sealing Method | O-ring with centering ring & clamp | Reliable HV sealing |
| Stub Length | Standard or custom | Functional flexibility |
| Vacuum Range | Up to ~10⁻⁷ mbar (typical) | Suitable for HV systems |
Comparison with Related Components
| Component | Key Advantage | Typical Application |
|---|---|---|
| Aluminum KF Blank Stub | Lightweight, easy handling | Labs & modular HV systems |
| Stainless Steel KF Blank Stub | Higher strength, bakeable | More demanding HV use |
| KF Blank Flange | Shortest closure | Direct port sealing |
FAQ
| Question | Answer |
|---|---|
| Are KF, QF, and NW interchangeable? | Yes, they refer to the same standardized flange system. |
| Does the stub include O-ring and clamp? | Typically supplied separately unless ordered as a kit. |
| Is it suitable for UHV systems? | Primarily for HV; CF components are preferred for UHV. |
| Can stub length be customized? | Yes, custom lengths and configurations are available. |
| Can anodized finishes be provided? | Yes, anodizing is available on request. |
Packaging
Our KF (QF) HV Blank Stubs (Aluminum 6061-T6) are cleaned, capped on sealing faces, and individually packed. Protective foam and export-grade cartons ensure safe transportation and prevent surface damage or contamination.
Conclusion
KF (QF) HV Blank Stubs (Aluminum 6061-T6) offer a lightweight, practical solution for sealing or extending KF vacuum ports in high-vacuum systems. With standardized compatibility, clean machining, and optional customization, they are well suited for laboratory, research, and general industrial vacuum applications.
For detailed specifications and a quotation, please contact us at sales@thinfilmmaterials.com.
Ordering Table
| Flange Size/OD | Type | Flange Material | Drawing | Part Number |
| KF10 (1.18" OD) | Stub, Blank | 6061-T6 Aluminum |
| QF10-050-UA |
| KF16 (1.18" OD) | Stub, Blank | 6061-T6 Aluminum |
| QF16-075-UA |
| KF25 (1.57" OD) | Stub, Blank | 6061-T6 Aluminum |
| QF25-100-UA |
| KF40 (2.16" OD) | Stub, Blank | 6061-T6 Aluminum |
| QF40-150-UA |
| KF50 (2.95" OD) | Stub, Blank | 6061-T6 Aluminum |
| QF50-200-UA |
Accessories Table
| Description | For | Per Package | Part Number |
| 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 (Aluminum with Fluorocarbon O-Ring) | KF10 Flanges | 1 | QF10-050-ARV |
| Centering Ring (Aluminum with Fluorocarbon O-Ring) | KF16 Flanges | 1 | QF16-075-ARV |
| Centering Ring (Aluminum with Fluorocarbon O-Ring) | KF25 Flanges | 1 | QF25-100-ARV |
| Centering Ring (Aluminum with Fluorocarbon O-Ring) | KF40 Flanges | 1 | QF40-150-ARV |
| Centering Ring (Aluminum with Fluorocarbon O-Ring) | KF50 Flanges | 1 | QF50-200-ARV |
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