Description
MKS HPS Stainless Steel Vacuum Bellows KF-40 NW-40 1.75in Bore 9.75in Long
This is a stainless steel flexible vacuum bellows manufactured by HPS, a division of MKS Instruments, based in Boulder, Colorado. It features KF-40 (NW-40) quick-clamp flanges on both ends and a corrugated accordion body that allows axial, lateral, and angular movement while maintaining a vacuum-tight seal. The flanges and sealing surfaces are clean and in good condition.
Specifications & What's Included
- Manufacturer: HPS Division of MKS Instruments, Boulder, CO USA
- Type: Flexible Vacuum Bellows
- Material: Stainless Steel (corrugated body and flanges)
- Flange Type: KF-40 / NW-40 quick-clamp, both ends
- Bore / Opening Diameter: 1.75 in (approx.)
- Overall Outer Diameter: 3 in (approx.)
- Overall Length: 9.75 in (approx.)
- Bellows only — no clamps, centering rings, or fittings included
Applications
Vacuum bellows like this are standard components in high-vacuum and rough-vacuum systems used in semiconductor fabrication, thin-film deposition, research laboratories, and scientific instrumentation. The KF-40 (NW-40) clamp-flange standard is one of the most widely used quick-connect interfaces in the vacuum industry, compatible with a broad range of turbomolecular pumps, roughing pumps, chambers, and gauging components. Flexible bellows serve several functions in these systems: they isolate mechanical pump vibration from sensitive chamber equipment, allow for slight misalignment between flanged components, and accommodate thermal expansion. HPS (High Purity Systems), now part of MKS Instruments, has long been a recognized supplier of vacuum fittings, valves, and components for semiconductor and research applications.
This MKS HPS stainless steel vacuum bellows was pulled from a working vacuum system and has been visually inspected. The corrugated body and both KF-40 flanges are intact and show no visible damage. The convolutions show light surface discoloration and minor oxidation consistent with normal use in a vacuum environment, as visible in the photos. The flange faces and sealing surfaces appear clean and undamaged. Please view our photo set and contact us if you have any questions.
Warranty Information
Additional Information
Brand: |
MKS Instruments (HPS Division) |
Model: |
HPS Vacuum Bellows |
MPN: |
Not Visible |
Type: |
Flexible Vacuum Bellows |
SKU: |
26994 |
Seller Notes: |
Bellows only — no clamps or fittings included. |
Country/Region of Manufacture: |
United States |
Material: |
Stainless Steel |
Flange Type: |
KF-40 / NW-40 Clamp Flange |
Bore / Opening Diameter: |
1.75 in |
Overall Outer Diameter: |
3 in |
Overall Length: |
9.75 in |
Connection Type: |
KF / QF Quick-Clamp (both ends) |
Compatible With: |
KF-40 / NW-40 vacuum systems and pumps |
Application: |
Vacuum pump isolation, semiconductor, research |
Condition Notes: |
This MKS HPS stainless steel vacuum bellows was pulled from a working vacuum system and has been inspected. Both KF-40 flanges and the corrugated body are intact. Light surface discoloration on convolutions from normal use. |
California Prop 65 Warning: |
WARNING: This product can expose you to chemicals including lead and lead compounds, and DEHP (a phthalate), which are known to the State of California to cause cancer and birth defects or other reproductive harm. Go to P65Warnings.ca.gov |
