Custom Sewn Round Bellows for Machine and Cylinder Protection

Sewn Round Bellows

BSTFLEX Sewn Round Bellows are custom-made flexible protective covers designed for hydraulic cylinder rods, ball screws, lead screws, shafts, actuators and other moving machine components. Their accordion-style construction expands and compresses with the movement of the equipment while helping protect precision parts from dust, abrasive particles, metal chips, oil, coolant, heat and general industrial contamination.

Unlike standard molded rubber bellows, sewn fabric bellows can be manufactured in a wide range of diameters, stroke lengths, compressed lengths and material combinations. This makes them particularly suitable for OEM machinery, replacement protection systems and applications where standard molded bellows cannot meet the required dimensions or operating conditions.

Custom Construction

Each round sewn bellows can be manufactured according to the actual dimensions and movement of the protected component.

Typical custom parameters include:

The relationship between inside diameter, outside diameter, convolution depth, compressed length and extended length is evaluated according to the required machine stroke and available installation space.

Material Options

Material selection is one of the most important factors in the performance of a sewn round bellows.

BSTFLEX can manufacture bellows from a range of industrial technical fabrics, including:

Coated Nylon Fabric
Suitable for general machine protection where flexibility, abrasion resistance and contamination control are required.

Silicone Coated Fiberglass Fabric
Recommended for elevated-temperature environments and machinery exposed to heat, sparks or hot surfaces.

PTFE Coated Fiberglass Fabric
Suitable for applications requiring temperature resistance, chemical resistance and a low-adhesion surface.

Aluminized Fiberglass Fabric
Used where radiant heat reflection is required around furnaces, foundry equipment, exhaust components or other high-temperature processes.

Other Technical Fabrics
Additional fabric constructions can be developed according to temperature, oil, coolant, chemical, abrasion and environmental requirements.

Hydraulic Cylinder Rod Protection

Hydraulic cylinder rods are highly sensitive to contamination and mechanical damage. Dust, metal particles and abrasive debris can accumulate on exposed rods and may eventually affect seals and hydraulic performance.

A custom hydraulic cylinder bellows forms a flexible protective barrier around the rod while allowing normal extension and retraction.

Round sewn bellows can be designed for:

• Hydraulic cylinder rods

• Pneumatic cylinder rods

• Linear actuators

• Lifting cylinders

• Industrial positioning systems

Ball Screw and Lead Screw Protection

Ball screws and lead screws require clean operating surfaces for reliable movement and positioning accuracy.

Sewn round bellows can help isolate these components from:

• Metal chips

• Grinding dust

• Coolant

• Oil contamination

• Abrasive particles

• General workshop debris

Custom ball screw bellows are commonly used on CNC machinery, automated production equipment, positioning systems and industrial machine tools.

Shaft and Actuator Protection

Round fabric bellows can also be used around:

• Rotating or reciprocating shafts

• Splines

• Linear actuators

• Spindles

• Guide rods

• Telescoping assemblies

• Mechanical linkages

The flexible pleated structure allows repeated movement without requiring a rigid protective enclosure.

High Temperature Sewn Bellows

For machinery operating near furnaces, hot process equipment, exhaust systems or radiant heat sources, BSTFLEX can manufacture high temperature fabric bellows using heat-resistant technical textiles.

Depending on the operating environment, silicone coated fiberglass, PTFE coated fiberglass, aluminized fiberglass and other high-temperature materials can be considered.

Temperature is not the only selection factor. The correct fabric should also be evaluated according to:

• Radiant heat

• Direct contact temperature

• Spark exposure

• Oil and coolant

• Abrasion

• Chemicals

• Mechanical cycling

• Outdoor or indoor service

Mounting Options

Different end constructions can be incorporated according to the machine design.

Typical mounting methods include:

• Fabric collars

• Clamp-mounted ends

• Flanged ends

• Reinforced end sections

• Grommet mounting

• Custom fastening systems

For components that cannot easily be disconnected, split or zippered round bellows can also be produced for easier installation and maintenance.

Applications

BSTFLEX Sewn Round Bellows are suitable for a wide range of industrial equipment, including:

• CNC machines

• Machine tools

• Hydraulic equipment

• Pneumatic equipment

• Industrial automation

• Robotics

• Lifting equipment

• Foundry machinery

• Metal processing equipment

• Packaging machinery

• Material handling systems

• Special-purpose machines

Information Required for a Custom Bellows

To manufacture the correct sewn round bellows, please provide the following information whenever possible:

1. Inside diameter

2. Maximum allowable outside diameter

3. Fully compressed length

4. Fully extended length

5. Required stroke

6. End mounting dimensions

7. Operating temperature

8. Type of contamination or environmental exposure

9. Movement frequency

10. Drawing, photograph or existing sample

If complete dimensions are unavailable, BSTFLEX can also evaluate photographs, drawings or an existing bellows sample.

Why Choose BSTFLEX Sewn Round Bellows

BSTFLEX combines custom textile fabrication with extensive experience in industrial heat-resistant and protective fabrics. This allows us to develop sewn bellows not only for general machine protection, but also for applications involving elevated temperatures, radiant heat and demanding industrial environments.

We support custom dimensions, special materials, prototype development and OEM production.

For a new project, send us your bellows dimensions, equipment drawing, working environment and temperature requirements. BSTFLEX can recommend a suitable material and construction for your application.