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ROTEX-GS Spider Insert – Zero Backlash, KTR Replacement, Polyurethane Elastomer Made In China
Model Number
Check below, custom
GS12
GS28
GS55
GS14
GS38
GS65
GS19
GS42
GS75
GS24
GS48
GS90
GR Series, ML Series
- Phone : +86 13431039760
- Wechat : +86 13431039760
- Whatsapp : +86 13431039760
- Email : ella@apexcoupling.com
Product Description
ROTEX-GS Spider Insert – Zero Backlash, KTR Replacement, Polyurethane Elastomer
Factory Direct | Premium Polyurethane / Hytrel | Zero Backlash Under Pre-Stress | Direct KTR ROTEX® GS Replacement | GS12 to GS90 | -50°C to +120°C | 92/98 Shore A & 64 Shore D | Maintenance-Free | OEM Customizable
The Apexcoupling ROTEX-GS Spider Insert is a high-performance elastomer element designed for zero-backlash jaw couplings. Fully interchangeable with KTR ROTEX® GS series, this spider insert is the heart of the coupling system – transmitting torque without backlash, absorbing vibration, and compensating for misalignment. Manufactured from premium polyurethane or Hytrel with multiple Shore hardness grades, these spiders provide zero-backlash operation under pre-stress, making them the ideal choice for servo motors, CNC machines, automation equipment, and precision positioning systems.
Available in GS12 through GS90 sizes with hardness options including 92 Shore A, 98 Shore A, 64 Shore D, and 72 Shore D, the ROTEX-GS spider insert delivers exceptional wear resistance, oil resistance, ozone resistance, and thermal stability for demanding industrial applications.
✅ Direct KTR ROTEX® GS replacement – no design changes required. Zero backlash under pre-stress – precise positioning for servo drives. Premium polyurethane / Hytrel – oil, ozone & wear resistant. -50°C to +120°C operating range – extreme temperature performance. Multiple hardness grades – tune stiffness and damping for your application. Maintenance-free – no lubrication required. GS12 to GS90 – comprehensive size coverage.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Product Name | ROTEX-GS Spider Insert (Elastomer Element) |
| Series | GS – Zero Backlash Servo Coupling Spider |
| Compatibility | Direct KTR ROTEX® GS replacement |
| Material Options | Premium polyurethane / Hytrel (thermoplastic polyester elastomer) |
| Hardness Options | 80 Shore A, 92 Shore A, 98 Shore A, 64 Shore D, 72 Shore D |
| Color Coding | 80 ShA – Blue; 92 ShA – Yellow; 98 ShA – Red; 64 ShD – Green; 72 ShD – Grey |
| Backlash | Zero – pre-stressed design eliminates clearance |
| Temperature Range (Standard) | -30°C to +90°C (continuous); -40°C to +120°C (instantaneous) |
| Temperature Range (High-Performance) | -50°C to +120°C (continuous); -60°C to +150°C (instantaneous) |
| Available Sizes | GS5, GS9, GS12, GS14, GS19, GS24, GS28, GS38, GS42, GS48, GS55, GS65, GS75, GS90 |
| Chemical Resistance | Oil, ozone, and aging resistant; hydrolysis resistant for tropical climates |
| Maintenance | None required – maintenance-free |
| Customization | OEM – custom sizes and hardness available |
| Place of Origin | Guangdong, China |
ROTEX-GS Spider Insert – Size & Dimensions
| Model | Outer Diameter (mm) | Inner Diameter (mm) | Height (mm) |
|---|---|---|---|
| GS12 | 25 | 10.5 | 11 |
| GS14 | 30 | 10.5 | 12 |
| GS19 | 40 | 18 | 14.5 |
| GS24 | 55 | 26 | 15.2 |
| GS28 | 65 | 30 | 19 |
| GS38 | 80 | 38 | 22 |
| GS42 | 95 | 46 | 24 |
| GS48 | 105 | 51 | 25.5 |
| GS55 | 120 | 60 | 27 |
| GS65 | 135 | 68 | 32 |
| GS75 | 160 | 80 | 37 |
| GS90 | 200 | 100 | 42 |
📐 Additional sizes (GS5, GS9) and custom dimensions available upon request.
Spider Hardness Selection – Choose the Right Grade
| Hardness | Color | Material | Temperature Range (°C) | Available Sizes | Best For |
|---|---|---|---|---|---|
| 80 Shore A-GS | Blue | Polyurethane | -50 to +80 (cont.) / -60 to +120 (inst.) | GS5 – GS24 | Electronic measurement systems, light precision drives |
| 92 Shore A-GS | Yellow | Polyurethane | -40 to +90 (cont.) / -50 to +120 (inst.) | GS5 – GS55 | Electronic measurement and control systems, standard servo drives |
| 98 Shore A-GS | Red | Polyurethane | -30 to +90 (cont.) / -40 to +120 (inst.) | GS5 – GS90 | Positioning drives, main spindle drives, high-load applications |
| 64 Shore D-H-GS | Green | Hytrel | -50 to +120 (cont.) / -60 to +150 (inst.) | GS7 – GS38 | Control drives, machine tool spindles, planetary gears, feed drives |
| 64 Shore D-GS | Green | Polyurethane | -20 to +110 (cont.) / -30 to +120 (inst.) | GS42 – GS90 | Higher loads, high torsional stiffness, high-temperature resistance |
| 72 Shore D-H-GS | Grey | Hytrel | -50 to +120 (cont.) / -60 to +150 (inst.) | GS24 – GS38 | Very high torsional stiffness, very high loads |
| 72 Shore D-GS | Grey | Polyurethane | -20 to +110 (cont.) / -30 to +120 (inst.) | GS42 – GS65 | Very high torsional stiffness, very high loads |
💡 Selection tip: For most servo motor and general industrial applications, 98 Shore A (Red) offers the best balance of torque capacity and damping. For maximum torsional stiffness in precision applications, choose 64 Shore D or 72 Shore D. For high-temperature environments, Hytrel-based spiders (64 ShD-H-GS, 72 ShD-H-GS) are recommended.
Why Choose ROTEX-GS for Servo Applications?
The ROTEX-GS spider insert is specifically designed for applications requiring precise positioning and zero-backlash operation:
Zero Backlash Under Pre-Stress – The spider is installed under pre-stress, eliminating rotational clearance.
High Torsional Stiffness – Despite its vibration-damping characteristics, the GS spider is torsionally stiff – no concessions to accuracy even with highly dynamic servo drives.
Axial Plug-in Design – Easy installation and replacement without moving connected equipment.
Vibration Damping – Protects connected equipment from shock loads and torsional vibration.
✅ The ROTEX-GS series is the preferred choice for servo drives, automation equipment, and machine tools where precision positioning is critical.
Product Structure
Star-Shaped Elastomer Body – Premium polyurethane or Hytrel with precise tooth geometry.
Multiple Teeth / Flaps – 4 to 12 teeth depending on model, engaging with coupling hubs.
Center Hole – Accommodates the coupling hub connection.
Pre-Stressed Design – Zero backlash under pre-stress.
💡 How it works: The ROTEX-GS spider insert is installed between the two hubs of a jaw coupling. The spider’s teeth engage with the jaws of the hubs, transmitting torque through radial compression. The pre-stressed design eliminates backlash, making it ideal for precise servo applications. The elastomer flexes to absorb shock, dampen vibration, and compensate for angular, radial, and axial misalignment.
Applications
Servo Motors – High-precision motion control, zero backlash requirement
CNC Machines – Feed drives, positioning systems
Machine Tools – Main spindle drives, planetary gears, feed drives
Automation Equipment – Pick-and-place systems, robotics
Electronic Measurement Systems – Precision measurement and control
Packaging Machinery – Register control, high-speed operation
Printing Equipment – Register control, high-speed operation
Test Benches – Precision testing and measurement
Medical Devices – Precision medical equipment
Why Choose Apex Coupling for ROTEX-GS Spider Inserts?
| Advantage | Description |
|---|---|
| Factory Direct | Competitive B2B pricing – no middlemen |
| Premium Materials | Polyurethane and Hytrel – oil, ozone, and wear resistant |
| KTR ROTEX® GS Replacement | Direct interchangeability – no design changes required |
| Zero Backlash | Pre-stressed design – precise positioning for servo drives |
| Wide Temperature Range | -50°C to +120°C (up to +150°C instantaneous) |
| Multiple Hardness Grades | 80 ShA to 72 ShD – tune stiffness and damping |
| Comprehensive Size Range | GS5 to GS90 – covers most industrial applications |
| OEM Customization | Custom sizes and hardness available |
| Fast Delivery | Stocked items available for quick shipment |
| ISO9001 Certified | Quality assured manufacturing |
FAQ
Q: What is a ROTEX-GS spider insert?
A: A ROTEX-GS spider insert is a polyurethane or Hytrel elastomer element that fits between the two hubs of a jaw coupling. It transmits torque, absorbs shock, dampens vibration, and compensates for misalignment with zero backlash under pre-stress. It is fully interchangeable with KTR ROTEX® GS series.
Q: What is the difference between ROTEX-GR and ROTEX-GS?
A: ROTEX-GR is the standard series for general industrial applications. ROTEX-GS is the servo series designed for zero-backlash, high-precision applications with pre-stressed design.
Q: What materials are used?
A: The spider inserts are manufactured from premium polyurethane or Hytrel (thermoplastic polyester elastomer) – offering excellent wear resistance, oil resistance, ozone resistance, and thermal stability.
Q: What is the temperature range?
A: Standard polyurethane operates from -30°C to +90°C (continuous) and -40°C to +120°C (instantaneous). Hytrel-based spiders operate from -50°C to +120°C (continuous) and -60°C to +150°C (instantaneous).
Q: What Shore hardness options are available?
A: Available hardness grades include 80 Shore A (Blue), 92 Shore A (Yellow), 98 Shore A (Red), 64 Shore D (Green), and 72 Shore D (Grey).
Q: Does the spider have backlash?
A: No. The ROTEX-GS series features zero backlash under pre-stress – no rotational clearance, ensuring precise positioning for servo applications.
Q: Is the spider oil and ozone resistant?
A: Yes. The polyurethane material is resistant to oils, ozone, and aging, with hydrolysis resistance suitable for tropical climates.
Q: Is this a replacement for KTR ROTEX® GS?
A: Yes. The ROTEX-GS spider insert is fully interchangeable with KTR ROTEX® GS series – same dimensions, same performance.
Q: What sizes are available?
A: Standard sizes include GS12, GS14, GS19, GS24, GS28, GS38, GS42, GS48, GS55, GS65, GS75, and GS90. Additional sizes (GS5, GS9) available on request.
Q: Can I get a custom spider?
A: Yes. We offer OEM customization – custom sizes and Shore hardness available.
Request a Quote
Send us your model (GS12, GS19, GS28, GS38, etc.), Shore hardness preference, and application details. Our engineers will recommend the optimal spider and provide a quotation within 24 hours.
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ROTEX-GS spider insert
