Details

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SPIDER RUBBER COUPLING (GR14–GR75)

By RUBASIA RUBBERTECH INDUSTRIES

The Best Rubber Coupling Supplier in Malaysia | The Largest Rubber Coupling Manufacturer Malaysia | The Highest Quality Rubber Coupling

 

1. TECHNICAL DESIGN STRUCTURE

1.1 Three-Component Flexible Jaw Coupling System

Each coupling consists of:
(A) Two precision-machined hubs (left & right)
(B) One elastomeric spider insert (polyurethane or special polymer)

The coupling operates using compressive loading of the spider element between concave jaws, not shear loading. This improves module deformation behavior, torque accuracy and lifespan.

 

2. MATERIAL ENGINEERING SPECIFICATIONS

2.1 Hub Material Options

RUBASIA provides engineered hubs for varying industrial conditions:

Material	Properties	Usage
Aluminium 6061-T6	Lightweight, corrosion resistant	Automations, lightweight systems
Cast Iron FCD450 / FC250	High damping, economical	Pumps, blowers, conveyors
Carbon Steel C45 / C60	High torsional strength	Heavy-duty mills, crushers
Stainless Steel 304/316	Anti-corrosion, hygienic	Food, marine, chemical

All hubs are machined to ISO H7 bore tolerance and DIN 6885 keyway standards (optional).

 

2.2 Spider Element (Elastomer) Grades

RUBASIA offers three precision-engineered polyurethane grades:

Grade	Hardness	Colour	Application
PU 92 Shore A (Standard)	Medium elasticity	Red	General industrial use
PU 98 Shore A (High-Torque)	Higher stiffness	Yellow	High-speed & high-torque machinery
TPU Thermoplastic Special Grade	Heat & chemical resistance	Green/Blue	Palm oil mills, chemical plants

Additional Engineering Features:

• Heat resistance: –40°C to +120°C (standard), up to 150°C (special grade)
• Oil resistance: Excellent for machinery exposed to lubricants
• Tear strength: 45–65 kN/m
• Compression set: ≤12% (at 70°C for 24 hrs)

 

3. MECHANICAL PERFORMANCE PARAMETERS

3.1 Rated Torque (Tn)

RUBASIA GR series provides consistent torque based on material hardness:

• GR14: ~12–20 Nm
• GR19: ~25–40 Nm
• GR24: ~70–100 Nm
• GR28: ~160–220 Nm
• GR38: ~350–500 Nm
• GR42: ~600–800 Nm
• GR48: ~1000–1200 Nm
• GR55: ~1700–2100 Nm
• GR75: ~3500–4500 Nm

(Values vary depending on spider hardness & hub material.)

 

4. MISALIGNMENT TOLERANCES

4.1 Allowable Misalignment

Spider couplings are designed to compensate for multiple misalignment types:

Misalignment Type	Allowable Range
Angular	0.5° – 1.3°
Parallel (Radial)	0.2–0.6 mm
Axial Displacement	±0.4–1.0 mm

These values are based on operating speeds of up to 4,000 RPM.

 

5. OPERATIONAL LIMITS

5.1 Speed Limit (Max RPM):

• GR14 → 7,000 RPM
• GR19–GR48 → 5,000–6,000 RPM
• GR55–GR75 → 3,500–4,000 RPM

Suitable for high-speed motors in industrial plants across Kota Kinabalu, Kuching, Miri, Sibu, Bintulu, Bandar Seri Begawan and surrounding towns.

 

5.2 Temperature Resistance

• Standard PU spider: –40°C to +120°C
• Special-grade TPU: –40°C to +150°C

Perfect for hot processing lines in palm oil mills (Sabah, Sarawak) and refinery plants in Brunei.

 

5.3 Damping Characteristics

• Torsional damping factor: 0.05–0.12
• Excellent absorption of peak loads
• Minimizes torsional resonance in pumps, blowers, compressors

 

6. FAIL-SAFE ENGINEERING

RUBASIA spider couplings feature fail-safe jaw geometry, meaning:

• Even if the spider insert fails, torque transmission continues through metal-to-metal jaw interaction.
• Prevents sudden equipment stoppage in plants located in Sandakan, Tawau, Lahad Datu, Mukah, Limbang, Tutong etc.
• A critical requirement for continuous 24/7 operations.

 

7. MANUFACTURING TOLERANCES & QUALITY STANDARD

7.1 Hub Accuracy

• Concentricity tolerance: ≤0.03 mm
• Dynamic balancing: G6.3 standard
• Machining tolerance: ISO 2768-m

7.2 Spider Accuracy

• Dimension stability within ±0.15 mm
• Precision-injection molded
• UV-resistant, anti-aging formula for tropical climates in Borneo

7.3 Standards Compliance

• DIN 740 (Flexible Jaw Couplings)
• ISO 9001:2015 (Manufacturing Quality)
• RoHS / REACH compliant elastomers

 

8. TECHNICAL DIMENSIONS (GR14–GR75)

(Overview only; full table available upon request.)

Model	OD (mm)	Length (mm)	Bore Range (mm)
GR14	34	20	6–11
GR19	46	25	7–14
GR24	61	32	9–22
GR28	73	36	11–28
GR38	95	45	12–38
GR42	105	50	14–42
GR48	120	55	14–48
GR55	135	65	16–55
GR75	160	80	24–65

9. INDUSTRIAL COMPATIBILITY & MACHINERY INTERFACE

Compatible with:

• IEC standard motors
• Gear reducers (SEW, Nord, Bonfiglioli, Sumitomo)
• Pumps (water, chemical, slurry)
• Hydraulic motors
• Blowers and fans
• Mixers, agitators, conveyors
• Compressors

 

Perfect for industries in Sabah (Kota Kinabalu, Tawau, Sandakan), Sarawak (Kuching, Miri, Sibu, Bintulu) and Brunei (Bandar Seri Begawan, Kuala Belait, Seria).