Round bellows

cylindricalPTFEcoated fabric

Product Overview
BSTFLEX sewn wire-supported bellows are custom flexible protective covers engineered for large-diameter, long-stroke and demanding industrial applications. An internal wire support structure maintains the bellows profile during extension and compression, minimizing fabric sag and ensuring stable movement over repeated cycles.

Applications
These wire-reinforced fabric bellows protect hydraulic cylinders, shafts, actuators, telescoping systems and other moving components from dust, metal chips, abrasion, oil, coolant, sparks and heat.

Construction and Benefits
The bellows combine flexible industrial fabrics with an internal wire support system. Wire reinforcement preserves circular geometry during travel, reduces collapse or sagging and delivers controlled behavior over long strokes.

• Improved dimensional stability
• Enhanced support for large-diameter bellows
• Reduced fabric collapse or sagging
• Suitable for long travel and extended lengths
• Efficient compressed-to-extended length ratio
• Flexible custom geometry
• Compatible with high-temperature technical fabrics

Custom Dimensions & Options
Each bellows can be customized for inside diameter, outside diameter, compressed length, extended length, stroke, wire spacing, fabric material and mounting configuration. Wire diameter, spacing and convolution geometry are adjusted to match diameter, movement frequency and required structural stability.

Materials

• Coated nylon (general industrial protection: flexibility, abrasion resistance, contamination protection)
• Silicone-coated fiberglass (elevated-temperature applications, heat and spark exposure)
• PTFE-coated fiberglass (temperature and chemical resistance, reduced surface adhesion)
• Aluminized fiberglass (radiant heat reflection for furnaces and hot machinery)
• High-temperature technical fabrics (constructions for severe heat, hot particles and demanding environments)

Large Diameter & Long Stroke Considerations
Large-diameter protective bellows face challenges such as sagging, uneven folding, twisting and contact with moving parts. Wire-supported construction mitigates these issues and is particularly suited to heavy industrial equipment and long-stroke mechanisms.

Typical Applications

• Large hydraulic cylinders
• Large shafts
• Vertical actuators and lifting mechanisms
• Telescoping systems
• Industrial presses and heavy machinery
• CNC and machine tools, ball screws and lead screws
• Foundry and furnace equipment
• Automation and material handling systems

Mounting & End Construction Options
Available end configurations include fabric collars, clamp-mounted ends, reinforced mounting sections, metal flanges, grommets, mounting plates and custom fastening systems. Split or zippered wire-supported constructions can be supplied for equipment that cannot be disassembled easily.

Information Required for Custom Production
Key specification inputs for custom manufacture include inside diameter, maximum outside diameter, fully compressed length, fully extended length, required stroke, mounting dimensions, installation orientation, operating temperature, environmental exposure, movement frequency and a drawing or equipment photograph.

Technical Specifications

• Bellows Type: Wire-Supported Sewn Bellows
• Shape: Round / Cylindrical
• Inside Diameter: Custom
• Outside Diameter: Custom
• Extended Length: Custom
• Compressed Length: Custom
• Stroke: According to application
• Wire Support: Custom diameter and spacing
• Fabric Material: According to environment (coated nylon, silicone/PTFE-coated fiberglass, aluminized fiberglass, high-temp fabrics)
• End Construction: Collar, flange, clamp or custom
• Closure: Closed, zipper, hook-and-loop or custom
• Production: Prototype and OEM quantities