DN16CF Edge-Welded Bellows

Material: 304L Flanges / 316L Bellows

Excellent corrosion resistance. Not recommended for use with hydrochlorides or halides.

Helium (He) Leak Rate <1x10^-10 mbar L/s

Rated for UHV

10,000 cycles service life

2x DN16CF Rotatable Flange with Clearance Bolt Holes

Length: 110mm-375mm.

Axial stroke: 265mm

Min ID: 16mm

Max OD: 34mm

Operational Temperature: 20°C

Max Bakeout: 80°C

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Edge-welded bellows are used to provide flexible, leak-tight motion in demanding vacuum and pressure environments. They are particularly suited to ultra-high vacuum (UHV) systems where minimal outgassing, high cleanliness, and long fatigue life are essential. Typical applications include linear motion feedthroughs, thermal expansion compensation, vibration isolation, pressure boundary sealing, and alignment mechanisms in vacuum chambers.

These bellows are manufactured from precision-stamped AISI 316L diaphragms, edge-welded to form a robust yet highly flexible assembly. They are also fitted with AISI 304L rotatable CF16 flanges (clearance bolt holes) and incorporate internal AISI 304 support rings, allowing the use of a central shaft up to Ø15 mm while maintaining stability and preventing buckling under vacuum or differential pressure.

The use of 300 series low-carbon stainless steels ensures excellent corrosion resistance and weld integrity, as well as low magnetic permeability and suitability for clean vacuum environments. However, these bellows are not recommended for use with hydrochlorides or halides.

All bellows are supplied UHV-clean, with plastic protective caps fitted to the flanges and sealed in a clean bag to prevent contamination prior to installation.

Key Features

• Edge-welded construction for high flexibility and long cycle life
• Suitable for ultra-high vacuum (UHV) and high-purity applications
• Internal support rings for guided shafts up to Ø15 mm
• Excellent corrosion resistance (material-dependent)
• Low outgassing, vacuum-compatible materials
• Supplied clean, capped, and sealed for immediate use

Typical Applications

• UHV linear and rotary motion systems
• Vacuum feedthroughs and manipulators
• Thermal expansion compensation in vacuum lines
• Precision instrumentation and research equipment
• Semiconductor, surface science, and accelerator systems

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Materials Available

Bellows can be supplied in the following materials to suit specific mechanical, thermal, or corrosion requirements:

• AISI 304L
• AISI 316L
• AM350
• Inconel® 625
• Inconel® 718
• Hastelloy® C-276

Sizes and Availability

• Various flange sizes (nominal bores) and overall lengths are available
• Custom configurations available on request
• Items not held in stock we can typically supply within 6 weeks

Please enquire for availability, custom dimensions, or material options, and our technical team will be happy to assist with selection for your application.