Hastelloy® is a special alloy with superior chemical compatibility. With the capability of manufacturing bellows from Hastelloy, applications with highly specialized and corrosive media can now benefit from bellows. Pharmaceutical, process and chemical equipment requiring high vacuum or positive pressure use edge welded bellows to ensure high accuracy and repeatable results.

Edge welded bellows offer high stroke capability in comparison to other bellows.  This can reduce the size of the required bellows as well as the cost.  Bellows made from Hastelloy can be designed as a mechanical seal, expansion joint, volume compensator, or actuator.

With the flexibility to customize, BellowsTech can manufacture and weld custom fittings, flanges, and weld rings to its bellows to make customer installations easy and seamless.

*Hastelloy® is a registered trademark of  Haynes International, Inc.

Bellows DD Form12-21B

Specifications – Hastelloy Bellows – PDF

Material Alloy 276 (Hastelloy 276C) (Haynes 242 also available; contact factory)
Thickness 0.003″ and up every 0.001″
Standard Leak Rate <1×10-5 std CC He/sec
Size Ranges
Outside Diameter 0.358″ (9.0932mm) to 22.205″ (564mm)*
Inside Diameter 0.198″ (5.029mm) to 19.921″ (505.99mm)*
Shapes Round standard. Non-Round Available; Contact Factory.
Temperature -420 to 1000°F
Length Up to 96 inches (244 cm)

*For other dimensional requirements, contact the factory


Typical Industries


Process Equipment Excellent Corrosion Resistance
Pharmaceutical Valves High Strength
Chemical Processing High Temperature

There are over 90 Standard Diaphragm sizes available.

View the entire die list here and quickly choose the best fitting bellows mechanical seal for your application