Cylindrical bellows BSTFLEX Sewn

roundPTFEcoated 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 framework stabilizes each convolution during extension and compression to reduce fabric sagging and maintain consistent geometry. These wire-reinforced fabric bellows protect hydraulic rods, shafts, actuators, telescoping mechanisms and other moving components from dust, metal chips, abrasion, oil, coolant, sparks and radiant heat. Customizable parameters include inside and outside diameters, compressed and extended lengths, stroke, wire diameter and spacing, fabric material and end-mounting configuration.

Wire Supported Construction
The internal wire framework defines and stabilizes each fold so the assembly does not rely solely on fabric stiffness. This design provides:

• Improved dimensional stability during cycles
• Better structural support for large diameters
• Reduced fabric collapse and sagging
• Suitability for long travel and extended lengths
• Efficient compressed-to-extended length ratio
• Flexible custom geometry options

Custom Dimensions (Key specification matrix)
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
End Construction: Collar, flange, clamp or custom
Closure: Closed, zipper, hook-and-loop or custom
Production: Prototype and OEM quantities

Large Diameter and Long Stroke Suitability
Large-diameter bellows are prone to uneven folding, twisting and contact with moving parts. Wire-supported construction maintains profile and folding consistency throughout motion, making it suitable for heavy machinery, presses, lifting systems and long-stroke telescoping equipment.

Material Options

• Coated nylon — general industrial protection with flexibility and abrasion resistance
• Silicone-coated fiberglass — for elevated temperatures and exposure to heat or sparks
• PTFE-coated fiberglass — chemical and temperature resistance with low surface adhesion
• Aluminized fiberglass — radiant heat reflection near furnaces and hot processes
• High-temperature technical fabrics — for severe heat, hot particles and demanding environments

High-Temperature Considerations
When heat-resistant fabrics cannot form rigid, self-supporting folds, the wire framework preserves bellows geometry while allowing use of flexible high-temperature materials. Consider exposure to radiant heat, welding sparks, hot particles, foundry and furnace environments when selecting materials and wire spacing.

Machine Protection Applications
These bellows protect moving components from:

• Dust
• Metal chips
• Grinding debris
• Abrasive particles
• Oil and grease
• Coolant
• Sparks
• Radiant heat
• Environmental contamination

Mounting Options
End and mounting configurations include fabric collars, clamp-mounted ends, reinforced mounting sections, metal flanges, grommets, mounting plates and custom fastenings. Split or zippered constructions can be used where equipment cannot be disassembled.

Information Required for Custom Production (parameters)

• Inside diameter
• Maximum outside diameter
• Fully compressed length
• Fully extended length
• Required stroke
• Mounting dimensions
• Installation orientation
• Operating temperature
• Environmental exposure
• Movement frequency
• Drawing or equipment photograph

Why Choose BSTFLEX
BSTFLEX combines custom industrial sewing and experience with high-temperature technical fabrics to supply wire-supported bellows for large-diameter and high-temperature applications. We provide custom dimensions, wire reinforcement, special materials, mounting arrangements and OEM production.

Technical Specifications

• Product: Wire Supported Sewn Bellows (BSTFLEX)
• Shape: Round / Cylindrical
• Dimensions: Custom inside/outside diameters, extended and compressed lengths
• Stroke: According to application
• Wire support: Custom diameter and spacing
• Fabric materials: Coated nylon, silicone-coated fiberglass, PTFE-coated fiberglass, aluminized fiberglass, high-temperature fabrics
• End construction: Collar, flange, clamp or custom
• Closure options: Closed, zipper, hook-and-loop or custom
• Production quantities: Prototype and OEM quantities
• Typical applications: Large hydraulic cylinders, shafts, actuators, telescoping systems, industrial presses, foundry and furnace equipment, lifting systems and heavy machinery