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Polyurethane Gear Coupling Elastomer Sleeve | J/HS Buffer Pad
Polyurethane Gear Coupling Elastomer Sleeve | J/HS Buffer Pad
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Polyurethane Gear Coupling Elastomer Sleeve – J/HS Series Buffer Pad
Keep your air compressor, pump, and drive machinery running smoothly with this high-performance Polyurethane Gear Coupling Elastomer Sleeve. Engineered from durable polyurethane rubber, this coupling spider insert acts as a flexible buffer between shaft hubs — absorbing mechanical vibration, dampening operational noise, and protecting connected equipment from sudden torque spikes and misalignment stress. Available in six standard J/HS sizes to suit a wide range of industrial and workshop applications.
Key Features
- Premium Polyurethane Construction: Outstanding wear resistance, oil resistance, and elasticity for long service life.
- Vibration Dampening: Flexible elastomer design absorbs vibration and reduces transmitted shock loads between coupled shafts.
- Noise Reduction: Cushioned tooth profile minimises operational noise compared to rigid metal couplings.
- Wide Application: Compatible with air compressors, hydraulic pumps, electric motors, generators, and general power transmission equipment.
- Multiple Sizes Available: Choose the correct J/HS designation for a precise, secure fit.
- Easy Installation: Drop-in replacement for worn or damaged coupling inserts — no special tools required.
- Made in Mainland China.
Size Reference Chart
| Option | Size Code | Dimensions (OD × H × ID, mm) | Teeth |
|---|---|---|---|
| A | 4J | 58.7 × 34 × 31.8 | 18 |
| B | 5J | 74.6 × 44 × 39.7 | 20 |
| C | 6J | 95.3 × 54.6 × 47.6 | 20 |
| D | 7J | 110.4 × 64.5 × 55.6 | 24 |
| E | 9J | 152 × 87 × 76.2 | 24 |
| F | 10J | 179.4 × 102 × 87.3 | 24 |
Specifications
- Material: Polyurethane Rubber (PU)
- Series: J / HS Jaw-Type Gear Coupling
- Sizes: 4J, 5J, 6J, 7J, 9J, 10J
- Country of Origin: Made in Mainland China
Applications
- Air compressors & pneumatic systems
- Hydraulic pumps & motors
- Electric motors & generators
- CNC machinery & conveyor systems
- Industrial power transmission drives
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For general workplace equipment safety standards and best practices, refer to the OSHA Mechanical Power Transmission Safety Guidelines.
Learn more: Hirth joint
Frequently Asked Questions
Q: What is a polyurethane gear coupling elastomer sleeve used for?
A: A polyurethane gear coupling elastomer sleeve (also called a spider insert or jaw coupling buffer) sits between the two metal hubs of a jaw-type gear coupling. It transmits torque while absorbing vibration, dampening mechanical shock loads, and accommodating minor shaft misalignment — protecting both the motor and driven equipment from premature wear.
Q: How do I choose the correct J/HS size for my coupling?
A: Match the size code (4J, 5J, 6J, 7J, 9J, or 10J) to your existing coupling hub or refer to the dimensions listed in the size chart above (outer diameter, height, and inner diameter). If replacing a worn insert, check the markings on your coupling hubs or measure the existing elastomer directly.
Q: Is polyurethane better than rubber for coupling inserts?
A: Polyurethane elastomers offer superior oil resistance, higher load capacity, and greater durability compared to standard natural rubber. They maintain their flexible properties over a wider operating temperature range, making them an excellent choice for air compressors and industrial machinery environments.
Q: How difficult is it to install this elastomer sleeve?
A: Installation is straightforward — simply place the elastomer spider between the two jaw coupling hubs and press them together. No special tools or adhesives are required. It is recommended to inspect and replace the elastomer insert at regular maintenance intervals to ensure optimal performance.
