Can the vacuum flexible bellows be customized in length?

Yes. Custom overall lengths are available according to drawings, installation dimensions, or application requirements. Standard lengths are also available for selected KF and ISO-K configurations.

Can KF and ISO-K flange configurations be customized?

Yes. The bellows can be supplied with KF or ISO-K flange configurations, including different flange sizes and connection arrangements according to the required vacuum system.

Can KF and ISO-K flanges be combined on the same bellows?

Yes. Mixed flange configurations can be supplied where required, subject to dimensional and application confirmation.

Can the bellows be manufactured according to a drawing?

Yes. Custom bellows can be supplied according to drawings, dimensions, flange configurations, length requirements, and other application specifications.

Can helium leak testing be specified?

Yes. 100% helium leak testing can be specified where controlled leak integrity is required. The final leak-rate specification and test method are confirmed according to the order requirement.

What vacuum applications are these flexible bellows suitable for?

They are suitable for vacuum piping, vacuum equipment, pumps, and process systems where a flexible connection is required between rigid components.

Are KF and ISO-K vacuum bellows available in different sizes?

Yes. KF configurations are available from KF16 to KF200, and ISO-K configurations are available from ISO63 to ISO200, subject to product configuration and dimensional confirmation.

Custom Vacuum Flexible Bellows | KF & ISO-K 304/316L Stainless Steel

Name: Custom Vacuum Flexible Bellows | KF & ISO-K 304/316L Stainless Steel
Brand: WeldPure

Tubing & Assemblies

Custom stainless steel vacuum flexible bellows with KF and ISO-K flange configurations. Available in multiple standard sizes and lengths, with custom dimensions, materials, and configurations available. Helium leak testing, including 100% testing, can be specified for vacuum-critical applications.

Material

Size

Length (mm)

Clear

Custom Vacuum Flexible Bellows | KF & ISO-K Stainless Steel

Custom stainless steel vacuum flexible bellows for vacuum piping, vacuum equipment, pumps, and process systems. Available with KF or ISO-K flange configurations in multiple standard sizes and lengths, with custom dimensions available for application-specific requirements.

The bellows provide a flexible connection between rigid vacuum components and can accommodate axial movement, vibration, installation misalignment, and other mechanical movement within the specified operating range.

Product Overview

WeldPure supplies vacuum flexible bellows with stainless steel bellows construction and vacuum flange connections for applications where flexibility is required between rigid vacuum components.

Standard configurations are available in KF16 to KF200 and ISO63 to ISO200, depending on the product configuration. Standard lengths are available from 100 mm to 2000 mm, with custom lengths and configurations available according to drawings or application requirements.

For vacuum applications requiring controlled leak integrity, 100% helium leak testing can be specified as part of the supply requirement. The final leak-rate specification and test method are confirmed according to the order requirement.

KF Vacuum Bellows

KF configurations are available for both small- and large-diameter vacuum connections.

KF16–KF50

KF Size	Bore Size	Clamp OD
KF16	16 mm	30 mm
KF25	25 mm	40 mm
KF40	40 mm	55 mm
KF50	50 mm	75 mm

KF63–KF200

KF Size	Available Lengths
KF63	100 \| 150 \| 200 \| 300 \| 400 \| 500 \| 800 \| 1000 \| 1500 \| 2000 mm \| Custom
KF80	100 \| 150 \| 200 \| 300 \| 500 \| 1000 \| 1500 \| 2000 mm \| Custom
KF100	100 \| 150 \| 200 \| 250 \| 300 \| 500 \| 1000 \| 1500 \| 2000 mm \| Custom
KF160	Custom Length
KF200	Custom Length

KF160 and KF200 configurations are available subject to application and dimensional confirmation.

ISO-K Vacuum Bellows

ISO-K configurations are available for larger vacuum piping and equipment connections.

ISO Size	Inside Diameter	Outside Diameter	Flange Diameter	Standard Length
ISO63	65 mm	86 mm	95 mm	100 mm
ISO80	80 mm	100 mm	110 mm	100 mm
ISO100	100 mm	125 mm	130 mm	100 mm
ISO125	125 mm	150 mm	155 mm	100 mm
ISO160	150 mm	178 mm	180 mm	100 mm
ISO200	200 mm	230 mm	240 mm	100 mm

ISO-K bellows can be supplied with different flange configurations, including ISO-K and ISO-K to ISO-F arrangements, according to the required connection.

Flexible Connection for Vacuum Systems

The thin-wall corrugated bellows structure provides flexibility compared with rigid vacuum tubing. Depending on the bellows configuration, it can help accommodate:

Axial movement
Mechanical vibration
Thermal movemen

Can the vacuum flexible bellows be customized in length?: Yes. Custom overall lengths are available according to drawings, installation dimensions, or application requirements. Standard lengths are also available for selected KF and ISO-K configurations.
Can KF and ISO-K flange configurations be customized?: Yes. The bellows can be supplied with KF or ISO-K flange configurations, including different flange sizes and connection arrangements according to the required vacuum system.
Can KF and ISO-K flanges be combined on the same bellows?: Yes. Mixed flange configurations can be supplied where required, subject to dimensional and application confirmation.
Can the bellows be manufactured according to a drawing?: Yes. Custom bellows can be supplied according to drawings, dimensions, flange configurations, length requirements, and other application specifications.
Can helium leak testing be specified?: Yes. 100% helium leak testing can be specified where controlled leak integrity is required. The final leak-rate specification and test method are confirmed according to the order requirement.
What vacuum applications are these flexible bellows suitable for?: They are suitable for vacuum piping, vacuum equipment, pumps, and process systems where a flexible connection is required between rigid components.
Are KF and ISO-K vacuum bellows available in different sizes?: Yes. KF configurations are available from KF16 to KF200, and ISO-K configurations are available from ISO63 to ISO200, subject to product configuration and dimensional confirmation.

Material	304 Stainless Steel, 316L Stainless Steel
Size	KF16, KF25, KF40, KF50, KF63, KF80, KF100, KF160, KF200, ISO63, ISO80, ISO100, ISO125, ISO160, ISO200, Custom
Length (mm)	100 mm, 150 mm, 200 mm, 250 mm, 300 mm, 400 mm, 500 mm, 800 mm, 1000 mm, 1500 mm, 2000 mm, Custom
Country of Origin	China
Leak Testing	100% Helium Leak Tested
Leak Rate	≤ 5 × 10⁻¹⁰ Pa·m³/s