Plastic Shaft Sleeves, Bearing Liners & Polymer Bushings for Industrial Equipment

Plastic Shaft Sleeves, Bearing Liners & Polymer Bushings for Industrial Equipment

Kaybin manufactures plastic shaft sleeves, polymer bushings and composite bearing liners for industrial rotating equipment where corrosion resistance, controlled wear and dry-running performance are required. These sleeves are precision machined to drawing or  sample for use in pumps, conveyors, agitators, marine systems and heavy-duty OEM assemblies across South Africa and Africa.

Boundary control: This page covers industrial polymer sleeves and liners only — not automotive cylinder liners or engine wet sleeves.

High-Intent Application Coverage

• Pump shaft wear sleeves
• Conveyor shaft sleeves
• Agitator shaft sleeves
• Marine shaft sleeves
• Bearing liners and composite sleeve bushings
• Spacer sleeves and alignment sleeves
• Polymer shaft bushings for mining equipment
• Dry-running shaft sleeves for contaminated environments

Used where bronze bushes, coated shafts or metal sleeves fail due to corrosion, galling or lubrication breakdown.

Sleeve Configurations & Hardware Interface Options

Kaybin manufactures:

• Plain shaft sleeves
• Flanged sleeves
• Split shaft sleeves (for in-situ removal)
• Grooved shaft liners
• Keyway shaft sleeves
• Anti-rotation feature sleeves
• Lubrication groove sleeves
• Press-fit polymer sleeves
• Bonded or polyurethane-coated sleeves

Retention methods reviewed:

• Interference fit polymer sleeve
• Running clearance shaft sleeve
• Mechanical locking features
• Anti-spin configurations

Engineering Performance & Design Considerations

Radial Load & PV Consideration

Material selection accounts for:

• Allowable radial load for plastic sleeves
• Surface speed limits for polymer sleeves
• PV value (pressure × velocity) plastic bearing performance
• Shaft sleeve wear rate in service

Fit & Clearance Engineering

Design review includes:

• Sleeve wall thickness calculation
• Interference fit tolerance band
• Running clearance selection
• Press-fit guideline reference
• Thermal expansion (polymer vs steel shaft)
• Moisture absorption dimensional shift (nylon)

Surface Finish Compatibility

Shaft finish is evaluated in relation to dry-running performance, wear behaviour and friction characteristics.

Material Options & Behaviour

Nylon Sleeves (PA6 / PA66 – natural & glass-filled)

• High load capacity
• Good fatigue resistance
• Moisture absorption managed in clearance design

Acetal / POM Sleeves (Delrin-type)

• Excellent dimensional stability
• Lower moisture absorption than nylon
• Suitable for tighter tolerance sleeve applications

UHMWPE Sleeves

• Very low friction
• High abrasion resistance
• Common in conveyor and bulk handling duty

PTFE Sleeves (Virgin & Filled)

• Extremely low coefficient of friction
• High chemical resistance
• Lower load capacity than nylon/acetal (application reviewed)

Polyurethane Sleeves (PU Elastomer)

• Shock absorption and vibration damping
• Impact-resistant sleeve applications

Final material selection depends on radial load, PV limits, speed, environment and lubrication conditions.