Product Overview
KF40 NW40 Centering Ring with Screen for Pump 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 QF40-SRV-SM is a KF40 centering ring with an integrated mesh screen for vacuum systems. It seals between two KF40 flanges while helping block large particulates and debris from reaching downstream pumps and gauges.
Key Features
- Fits KF40 flanges, also known as NW40 or QF40
- Stainless steel centering ring
- FKM Viton O-ring
- Integrated mesh screen for particulate protection
- Mesh size: 70 x 70 squares per inch
- Wire diameter: 0.12 mm / 40 swg
- Temperature limit: 200 C for the FKM O-ring
- Requires a compatible KF40 clamp and two mating KF40 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 fusor and hobbyist vacuum setups
Frequently Asked Questions
What flange size does this centering ring fit?
It is designed for KF40 NW40 QF40 flanges only.
What is the O-ring material?
This model uses an FKM Viton O-ring.
Does the screen reduce 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 bolted flanges or ISO-K systems.
Good choice for buyers who need KF40 sealing with added debris protection. Verify your flange size and confirm that reduced conductance is acceptable for your application.
