Product Overview
KF25 NW25 Centering Ring with Screen for Particulate Protection in Vacuum Lines
Condition
Single unit available. Unused NOS condition with no issues noted during visual evaluation. Evaluation: Visual inspection only. Function testing not performed. Packaging is a bit beat up, but the part is in great shape and looks unused. Genuine Kurt J. Lesker part obtained from a government research facility and covered by our No Hassle PartsMine Guarantee.
Ships same business day from Idaho. Packed carefully.
Product Overview
Kurt J. Lesker QF25-SRV-SM is a KF25 centering ring with integrated mesh screen for vacuum systems. It creates a seal between two KF25 flanges while helping block debris and larger particulates from reaching downstream pumps or sensitive components.
Key Features
- Fits KF25 flanges, also known as NW25 or QF25
- Stainless steel centering ring
- FKM fluorocarbon Viton O-ring
- Integrated protective mesh screen
- Mesh size: 70 x 70 squares per inch
- Wire diameter: 0.12 mm
- Requires a compatible KF25 clamp and two mating KF25 flanges
Applications
- Protecting turbomolecular pumps from debris in forelines and roughing lines
- Adding particulate protection at chamber exhaust ports
- Vacuum plumbing in laboratory and semiconductor systems
- Pump protection in hobbyist and thin film vacuum setups
Frequently Asked Questions
What flange size does this centering ring fit?
It is designed for KF25 NW25 QF25 flanges only.
What is the O-ring material?
This model uses an FKM fluorocarbon Viton O-ring.
Does the screen affect vacuum flow?
Yes. The mesh screen reduces conductance, so it should not be used where maximum pumping speed is critical.
Will this fit CF or ISO-K systems?
No. It is not compatible with CF or ISO-K bolted flange systems.
Good choice for buyers who need KF25 sealing with added particulate protection. Verify your flange size and confirm that reduced conductance is acceptable for your application.
