MT Series Polyurethane Spider Insert – Elastomeric Coupling Element for Plum/Jaw Couplings, 22.4–2500 N·m

Factory direct | High-strength TPU polyurethane | Oil-resistant, wear-resistant | -40°C to +100°C operating range | MT1 to MT13 sizes | 22.4–2500 N·m torque capacity | 4 to 12 flaps | OEM/ODM/OBM | GB/T5272-85 standard

The Apexcoupling MT Series is a high-performance polyurethane spider insert (also known as a plum coupling elastomer, jaw coupling spider, or coupling cushion pad) designed for flexible power transmission in plum/jaw couplings. Manufactured from high-strength thermoplastic polyurethane (TPU) , this elastomeric element transmits torque without backlash, absorbs shock loads, dampens vibration, and compensates for misalignment – while protecting connected equipment from damage. Available in MT1 through MT13 sizes with 4 to 12 flaps and torque capacities from 22.4 to 2500 N·m, the MT series is the ideal replacement element for plum couplings, jaw couplings, and mechanical shaft joints in excavators, air compressors, large equipment, and general industrial machinery.

✅ Oil-resistant and wear-resistant – 3-5x longer life than rubber. Maintenance-free – no lubrication required. Direct replacement for standard MT series couplings. –40°C to +100°C operating range.

Key Technical Specifications

🔧 Custom sizes, Shore hardness (80A-98A), and special materials available. Contact us with your specifications.

MT Series – Model Range & Specifications

📐 Dimensions are for reference. Custom sizes available upon request. Contact our engineering team for custom sizing.

Product Structure

1. Polyurethane Elastomer Body – High-strength TPU material with star/plum blossom shape.

2. Multiple Flaps (4–12) – Provides torque transmission and shock absorption.

3. Center Hole – Accommodates the coupling hub.

💡 How it works: The MT spider insert is installed between the two hubs of a plum/jaw coupling. The flaps engage with the jaws of the hubs, transmitting torque while the elastomeric material absorbs shock, dampens vibration, and compensates for misalignment. The spider is the wear element of the coupling – designed for easy and cost-effective replacement without moving the hubs or disconnecting the shafts .

Product Features & Advantages

MT Series Spider vs Rubber – Why Choose Polyurethane?

✅ Polyurethane is the clear winner for demanding applications – longer life, better wear resistance, superior oil resistance, and wider temperature range.

Applications

• Excavators – Power transmission in heavy equipment 

• Air Compressors – Shock absorption and vibration damping 

• Mining Equipment – Crushers, conveyors, feeders 

• Construction Machinery – Heavy-duty power transmission

• Pumps – Centrifugal, gear, and diaphragm pumps

• Conveyors – Material handling systems

• CNC Machines – Precision motion control 

• Motors & Gearboxes – General power transmission 

• Automation Equipment – Pick-and-place systems, indexing tables 

• Large Industrial Equipment – Mechanical cushioning and shaft joint buffering 

Why Choose Apex Coupling for MT Series Spider Inserts?

FAQ

Q: What is an MT series spider insert?
A: An MT series spider insert (also called a plum coupling elastomer or jaw coupling spider) is a polyurethane elastomeric element that fits between the two hubs of a plum/jaw coupling. It transmits torque, absorbs shock, dampens vibration, and compensates for misalignment.

Q: What materials are used?
A: The MT series is manufactured from high-strength TPU (thermoplastic polyurethane) – offering excellent wear resistance, oil resistance, and 3-5x longer service life than rubber .

Q: What is the operating temperature range?
A: The MT series operates in temperatures from -40°C to +100°C .

Q: What is the torque range?
A: The MT series covers 22.4 – 2500 N·m torque capacity .

Q: What sizes are available?
A: MT1 through MT13 – covering outer diameters from 48mm to 391mm .

Q: How many flaps does each model have?
A: MT1 (4 flaps), MT2-MT6 (6 flaps), MT7-MT8 (8 flaps), MT9-MT11 (10 flaps), MT12-MT13 (12 flaps) .

Q: Is the spider oil-resistant?
A: Yes. Polyurethane has low affinity with mineral oil and is non-corrosive in fuel oil and mechanical oil .

Q: Does the spider require lubrication?
A: No. The MT series is maintenance-free – no lubrication required .

Q: What is the Shore hardness?
A: Standard hardness is 95A ±5 (90–98 Shore A) . Custom hardness (80A-98A) available on request.

Q: Can I get a custom spider?
A: Yes. We offer OEM customization – custom sizes, Shore hardness, and materials available.

Request a Quote

Send us your MT model (e.g., MT5, MT8, MT12), dimensions, Shore hardness preference, and application details. Our engineers will recommend the optimal spider and provide a quotation within 24 hours.