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ROTEX Type Jaw Spider Coupling – PU 98ShA, Zero Backlash, H7 Bore, OEM Customizable
Model Number
Check below, custom
D30-L35-Bore(6~16)
D40-L66-Bore(6~25)
D55-L78-Bore(8~35)
D65-L90-Bore(10~42)
D80-L114-Bore(10~50)
D95-L126-Bore(10~55)
D105-L140-Bore(10~65)
D120-L160-Bore(15~70)
D135-L185-Bore(15~75)
D160-L210-Bore(20~95)
- Phone : +86 13431039760
- Wechat : +86 13431039760
- Whatsapp : +86 13431039760
- Email : ella@apexcoupling.com
Product Description
ROTEX Type Jaw Spider Coupling – PU 98ShA, Zero Backlash, H7 Bore, OEM Customizable
Factory direct | 304/316 stainless steel, 45# steel, or aluminum | 98ShA PU spider | Zero backlash | H7 bore | 300 N·m | 5000 RPM | Clamp screw design | OEM/ODM
The Apexcoupling ROTEX Type Jaw Spider Coupling (also known as a plum coupling or curved jaw coupling) is a precision flexible coupling designed for high-performance power transmission in demanding industrial applications. Featuring a 98ShA polyurethane spider element, this coupling delivers zero backlash operation, excellent vibration damping, and reliable torque transmission. Available in 304/316 stainless steel, 45# steel, or aluminum, with H7 precision bore and clamp screw fastening, it is the ideal solution for manufacturing plants, food & beverage processing, construction, energy & mining, and general industrial machinery.
✅ Zero backlash – suitable for positive and negative rotation. H7 bore precision for high concentricity. OEM customizable bore sizes available.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Brand | Apexcoupling |
| Model Series | ROTEX Type / Jaw Spider / Plum Coupling |
| Type | Flexible / Elastomeric / Jaw / Spider |
| Structure | Curved jaw (spider type) |
| Body Material Options | 304 stainless steel, 316 stainless steel, 45# carbon steel, or Aluminum alloy |
| Spider Material | Polyurethane (PU) – 98 Shore A hardness |
| Spider Color | Red (standard) |
| Bore Diameter | 50 mm (example) – customizable |
| Rated Torque | 300 N·m |
| Maximum Speed | 5000 RPM |
| Backlash | Zero (zero rotational clearance) |
| Bore Tolerance | H7 (precision fit) |
| Misalignment Compensation | Radial, angular, and axial deviations |
| Vibration Absorption | Yes (PU spider dampens shock and vibration) |
| Fastening Method | Clamping screw (set screw) |
| Design | Detachable – easy installation and maintenance |
| Standard or Nonstandard | Standard with OEM/ODM support |
| Customized support | OEM, ODM |
| Applicable Industries | Manufacturing plants, machinery repair shops, food & beverage factories, home use, retail, construction works, energy & mining |
| Warranty | 1 Year |
| Place of Origin | Guangdong, China |
🔧 Custom bores, keyways, spider hardness, and special materials available. Contact us with your specifications.
Material Options
| Material | Properties | Best For |
|---|---|---|
| 304 Stainless Steel | Excellent corrosion resistance, good strength, hygienic | Food & beverage, chemical, general industry |
| 316 Stainless Steel | Superior corrosion resistance, marine-grade | Marine, pharmaceutical, highly corrosive environments |
| 45# Carbon Steel | High strength, high hardness, wear resistance | Heavy-duty industrial, high torque applications |
| Aluminum Alloy | Lightweight, low inertia, corrosion-resistant | High-speed, precision, low-torque applications |
98ShA PU Spider – Technical Details
The 98 Shore A polyurethane spider is the heart of this coupling:
| Property | Value |
|---|---|
| Material | Polyurethane (PU) |
| Hardness | 98 Shore A |
| Color | Red (standard) |
| Characteristics | High abrasion resistance, high elasticity, excellent damping, oil-resistant, water-resistant |
| Temperature Range | -20°C to 80°C (typical) |
| Backlash | Zero (press-fit with curved jaws) |
💡 The 98ShA spider provides high torsional rigidity while still offering excellent vibration damping and misalignment compensation.
Product Features & Advantages
| Advantage | Benefit |
|---|---|
| Zero Rotational Clearance | No backlash – ideal for positive and negative rotation, servo motors, and precision positioning |
| 98ShA PU Spider | High torsional rigidity with excellent damping, oil/water resistance, and wear resistance |
| H7 Precision Bore | High concentricity, accurate shaft fit, reduces vibration |
| Multiple Material Options | 304SS, 316SS, 45# steel, or aluminum – choose based on your environment and load |
| Clamping Screw Fastening | Secure shaft locking, easy installation and adjustment |
| Misalignment Compensation | Compensates for radial, angular, and axial deviations – protects bearings and seals |
| Detachable Design | Easy installation and maintenance – replace spider without moving hubs |
| High Speed Capability | Up to 5000 RPM – suitable for high-speed machinery |
| OEM/ODM Customization | Custom bores, keyways, spider hardness, and materials available |
| ISO9001 & BV Certified | Quality assured for international buyers |
| CAD Design Support | Engineering drawings provided upon request |
| Professional Selection Support | Free sizing and selection assistance |
Product Structure
Two Hubs – Precision-machined from 304SS, 316SS, 45# steel, or aluminum with curved jaws.
98ShA PU Spider – Red polyurethane elastomer that transmits torque, absorbs shock, and compensates for misalignment.
Clamping Screws – Secure fastening to shafts.
💡 The curved jaw profile ensures a press-fit with the spider, eliminating backlash and providing smooth, precise torque transmission.
Applications
Manufacturing Plants – General power transmission
Machinery Repair Shops – Replacement and upgrade parts
Food & Beverage Processing – With stainless steel option for hygienic applications
Construction Machinery – Reliable drives in harsh environments
Energy & Mining – Conveyors, feeders, crushers
Pumps – Centrifugal, gear, screw, and diaphragm pumps
Fans & Blowers – Industrial ventilation, air handling
Packaging Machinery – Reliable, maintenance-friendly drives
Printing Equipment – Smooth, high-speed operation
CNC Machines – Precision motion control
Servo Motors & Stepper Motors – Zero backlash for precise positioning
Why Choose Apex Coupling for ROTEX Jaw Spider Couplings?
| Advantage | Description |
|---|---|
| Factory Direct | Competitive B2B pricing – no middlemen |
| Premium Materials | 304SS, 316SS, 45# steel, or aluminum – choose based on your needs |
| 98ShA PU Spider | High torsional rigidity with excellent damping characteristics |
| Zero Backlash | Precision performance for reversible and servo applications |
| H7 Precision Bore | High concentricity, accurate shaft fit |
| Clamping Screw Design | Secure fastening, easy installation |
| OEM/ODM Support | Custom bores, keyways, materials, and branding |
| CAD Design Support | Engineering drawings available |
| Professional Selection Support | Free sizing assistance |
| ISO9001 & BV Certified | Quality assured for international buyers |
FAQ
Q: What is a ROTEX type jaw spider coupling?
A: It is a flexible coupling (also called a plum coupling or curved jaw coupling) consisting of two metal hubs with curved jaws and an elastomeric spider. The curved jaw profile ensures zero backlash operation.
Q: What does “98ShA” mean?
A: 98ShA refers to the Shore A hardness of the polyurethane spider. 98 Shore A is a medium-hard formulation that provides high torsional rigidity while still offering excellent vibration damping.
Q: What materials are available for the hubs?
A: We offer 304 stainless steel, 316 stainless steel, 45# carbon steel, and aluminum alloy. Choose based on your environment and load requirements.
Q: What is the bore tolerance?
A: Standard bore tolerance is H7 for precision shaft fit and high concentricity.
Q: What is the torque and speed rating?
A: Rated torque is 300 N·m and maximum speed is 5000 RPM. Specific ratings vary by model size.
Q: Does the coupling have backlash?
A: No. The ROTEX type coupling features zero backlash – no rotational clearance, suitable for positive and negative rotation.
Q: Can the coupling compensate for misalignment?
A: Yes. The PU spider compensates for radial, angular, and axial deviations.
Q: Can I get a custom bore size?
A: Yes. We offer OEM and ODM customization – custom bores, keyways, and special designs available.
Q: Do you provide CAD drawings?
A: Yes. We offer CAD design support and can provide engineering drawings upon request.
Q: What is the warranty?
A: 1 Year – quality assured.
Request a Quote
Send us your bore size, material preference, torque, speed, and application details. Our engineers will recommend the optimal model and provide a quotation within 24 hours.
ROTEX coupling
jaw spider coupling
plum coupling
98ShA PU spider
zero backlash coupling
H7 bore coupling
stainless steel jaw coupling
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