Description
MKS HPS Stainless Steel Vacuum Bellows 2" Opening 3" OD 9.75" Tall NW50 Flex
This is a stainless steel corrugated vacuum bellows from HPS Division of MKS Instruments, featuring NW50 (KF50) quick-flange connections on both ends. Vacuum bellows of this type serve as flexible connectors within high- and rough-vacuum plumbing, absorbing vibration and thermal expansion between a vacuum pump and a chamber or manifold while maintaining a leak-tight seal. The unit is stamped "HPS DIV OF MKS BOUL[DER CO] USA" on the flange rim, confirming domestic manufacture.
Specifications & What's Included
- Manufacturer: MKS Instruments — HPS Division (Boulder, CO, USA)
- Type: Corrugated stainless steel vacuum bellows / flexible vacuum line connector
- Opening (bore) diameter: 2 inches
- Overall outer diameter: 3 inches
- Overall length: 9.75 inches
- Flange standard: NW50 / KF50 quick-flange on both ends
- Material: Stainless steel body and flanges
- O-ring seals: Present and seated in both flange grooves
- Country of manufacture: USA (stamped on flange)
Applications
Vacuum bellows like this are standard plumbing components in rough-vacuum and high-vacuum systems. They are used to connect vacuum pumps (rotary vane, turbomolecular, dry scroll, etc.) to vacuum chambers, forelines, or manifolds wherever a rigid hard-plumbed connection would transmit vibration, risk misalignment stress, or need to accommodate thermal expansion and contraction. The NW50/KF50 flange standard is one of the most widely used quick-connect fitting standards in laboratory and industrial vacuum work, compatible with a broad range of vacuum equipment from manufacturers such as Pfeiffer, Edwards, Leybold, Varian, and MKS itself. These components are common in semiconductor processing tools, physical vapor deposition (PVD) systems, electron beam equipment, thin-film coating chambers, and general scientific vacuum apparatus. Because the corrugated metal body flexes in all axes, they also serve as vibration isolators that help prevent pump noise and mechanical oscillation from reaching sensitive instruments or chamber assemblies. The HPS Division of MKS Instruments has long been a primary supplier of vacuum fittings, flanges, valves, and flexible connectors to the semiconductor, research, and industrial vacuum markets.
This MKS HPS stainless steel vacuum bellows has been inspected and is in good used condition. The corrugated stainless body is intact with no visible cracks or deformation. Both NW50 flanges show light surface oxidation and age-related discoloration, which is typical for used vacuum hardware. O-ring seals are present and seated in both flange grooves. 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 legible in photos |
Type: |
Stainless Steel Vacuum Bellows / Flex Connector |
SKU: |
26993 |
Opening Diameter: |
2 inches |
Overall Diameter: |
3 inches |
Overall Length / Height: |
9.75 inches |
Flange Standard: |
NW50 / KF50 |
Material: |
Stainless Steel |
Seal / O-Ring: |
O-ring seal present on both flanges |
Connection Type: |
KF / NW Quick-Flange (NW50 / KF50) |
Application: |
Vacuum system flex connection, vibration isolation |
Compatible With: |
Vacuum pumps, chambers, systems with NW50/KF50 fittings |
Seller Notes: |
Inspected and in good condition. O-rings present on both flanges. |
Country/Region of Manufacture: |
USA |
Condition: |
Used – Inspected |
Condition Notes: |
MKS HPS stainless vacuum bellows, inspected and in good used condition. Corrugated body intact, no visible cracks. Both NW50 flanges show light oxidation. O-ring seals present on both ends. |
