Product Overview
The Square Flange Edge Welded Bellows solves a persistent integration challenge: how to connect a flexible vacuum element to non-round vacuum ports, rectangular chamber apertures, and custom equipment interfaces that standard round CF/ISO flanges cannot accommodate. Every square flange bellows is fully custom-engineered — flange dimensions, bolt pattern, bellows geometry, and material are tailored to your specific equipment interface, eliminating the need for cumbersome round-to-square adapter plates that add cost and potential leak paths.
This product is manufactured from AM350 precipitation-hardening stainless steel — the premium choice for applications demanding maximum fatigue life under high-cycle dynamic loading. AM350 offers 2-5x longer cycle life than SS316L under identical stroke conditions, making it the definitive material for aerospace actuators, satellite propulsion bellows, and any application where fatigue failure is the primary life-limiting factor. For a detailed comparison, see our Material Selection Guide.
Key Benefits
- True square/rectangular flange integration — built to your exact port dimensions and bolt pattern; no adapter plates, no compromise on leak integrity
- AM350 material advantage — 2-5x greater fatigue life than SS316L at equivalent stroke; the definitive choice for high-cycle dynamic applications where downtime is not an option
- Fully customizable — flange geometry, bellows OD/ID, convolution count, stroke length, spring rate, and surface finish all specified to your requirements
- Superior vacuum sealing — edge welded metal diaphragm construction with helium leak test verification to <1×10⁻⁹ mbar·L/s
- Multi-directional motion compensation — simultaneous axial, angular, and lateral compliance in a single component, simplifying system design
Technical Specifications
- Flange Shape: Square / Rectangular — custom dimensions, bolt patterns, and sealing surface finish to your drawing
- Material: AM350 Precipitation-Hardening Stainless Steel (SS316L and Inconel 718 also available)
- Vacuum Level: 10⁻⁸ mbar (standard); UHV 10⁻¹⁰ mbar with appropriate sealing design
- Operating Temperature: -269°C to +427°C (AM350)
- Flange Size: Fully customizable — contact engineering with your port dimensions
- Axial Stroke: Custom-designed per application requirements
- Leak Rate: < 1×10⁻⁹ mbar·L/s (helium MST verified)
- Cycle Life: Application-dependent — AM350 typically achieves 2-5x SS316L cycle life under identical conditions; FEA fatigue prediction available on request
- Manufacturing: Edge welded with micro-plasma process; Class 10,000 cleanroom assembly
Typical Applications
- Aerospace and satellite systems — non-round vacuum chamber interfaces, propulsion system flexible joints, cryogenic cooling line bellows
- Rectangular vacuum chamber interfaces — custom vacuum vessels for research and industrial processing with non-standard port geometries
- Special research equipment — custom synchrotron beamline components, neutron scattering instrument vacuum interfaces
- Non-standard automation equipment — custom motion feedthroughs for proprietary manufacturing tools
- Special equipment mounting interfaces — any application where standard round flanges cannot mate with existing hardware
