COUPLINGS
Flexible couplings are vital in industrial machinery because they ensure smooth power transmission, protect equipment from damage, and enhance reliability by compensating for misalignments and absorbing shocks. Their applications span across pumps, compressors, turbines, conveyors, and gear systems, making them indispensable in modern engineering.
Flexible couplings are often described as the “silent guardians” of industrial machinery because they quietly ensure reliability and efficiency.
Importance of Industrial Flexible Couplings
Power Transmission Efficiency
They connect two rotating shafts (drive & driven) and transmit torque while allowing for angular, parallel, or axial misalignments.
Reduced Downtime
By absorbing shocks and dampening vibrations, they prevent premature wear and mechanical failures, ensuring continuous operation.
Protection of Equipment
Flexible couplings act as mechanical buffers, protecting motors, gearboxes, and driven equipment from overloads and misalignment stresses.
⚙️ Applications of Flexible Couplings
Flexible couplings are widely used across industries where rotating machinery is critical:
Pumps & Compressors
To handle misalignments caused by thermal expansion and foundation shifts.
HVAC & Building Systems
Ensuring smooth operation of fans, blowers, and chillers.
Power Generation
In turbines and generators, where vibration damping is crucial.
Material Handling
Conveyors and mixers rely on couplings to maintain alignment under load.
Automotive & Aerospace
Used in drive shafts and gear systems for precision and durability.
Heavy Machinery
Mining, steel, and cement industries use them to withstand shock loads and harsh conditions.
Type
Purpose
Capacity ranges
Typical Applications
Gear Coupling (metallic coupling)
High torque capacity, durable
- Pumps, Industrial fans & Blowers, compressors and Compactors
- Conveyors & Elevators
- Overhead cranes, hoist
- Steel mills, sugar, Coal, Cements, paper industries etc
Elastomeric Coupling (Jaw flex coupling)
Vibration damping, easy installation
- Pump
Industrial fans
Compactors and compressors
Industrial gears
- Agitators
- Conveyors
Disc Coupling (High performance metallic coupling API and Non-API compliance )
High precision, no lubrication
Turbines, aerospace systems, high speed pumps, API pumps, pumps for petroleum industries,
Grid Coupling (metallic coupling)
Shock absorption, flexible
- Conveyor & crushers
- Ball mill, Coal mill
- Cement mill, Raw mill
- Roughing & finishing mill
- Coilers & Decoilers
- Winding & unwinding stand
- Compressors and Blowers
Pin-Bush couplings (Flexible couplings)
Size – 105 to 1000
Rated torque- 200 to 1,95,000 N-M
Maximum bore- 360mm
Size- 20 to 330
Rate torque- 50 to 2,50,000 N-M
- Pumps
- Industrial fans & Blowers
- Conveyors & Elevators
- Compactors & Compressors
- Coal handling, Sugar, Mining, Cement &
- Paper industry
Maximum bore- 355mm
- Pumps
- Industrial fans & Blowers
- Conveyors & Elevators
- Compactors & Compressors
- Coal handling, Sugar, Mining, Cement &
- Paper industry
Selection Criteria
Maintenance Needs
Operational Risks
Choosing the wrong type can lead to inefficiency or failure. Factors like torque, speed, misalignment tolerance, and environment must be considered.
Some couplings (gear, grid) require lubrication, while elastomeric and disc types are maintenance-free.
Overlooking coupling performance can cause costly downtime and equipment damage.
Jaw Flex couplings
Axial plugin elastomer flexible coupling: (H shaped resilient blocks)
Size: 110 to 250
Torque: 160 to 2800 Nm
Maximum bore: 100 mm
Size: 58 to 250
Torque: 19 to 2800 Nm
Maximum bore: 100 mm
Size: 80 to 250
Torque: 60 to 2800 Nm
Maximum bore: 100 mm
Grid Coupling (metallic coupling)
Size: 70 to 280
Power: 0.33 to 33 kw @100 rpm
Maximum bore:90mm
Spider elastomer jaw coupling
Size: 35 to 350mm
Torque: 0.38 to 4308 Nm
Maximum diameter: 115mm
Snap wrap couplings:
Size: 35 to 226
Torque: 0.38 to 327 Nm
Rubber type: Synthethic rubber
Polyurethane, H Trans
Tyre couplings
Without outer clamp ring
Size: 110 to 250
Torque: 160 to 2800 Nm
Maximum bore: 100 mm
With outer clamp ring
Size: 58 to 250
Torque: 19 to 2800 Nm
Maximum bore: 100 mm
Gear couplings
AGMA Gear coupling: (Interchangeable half gear coupling) (ATTEX certified available on request)
Size: 101 to 701
Torque: 1423 to 156620 Nm
Maximum bore: 260mm
Full gear coupling (Non AGMA) (ATTEX certified available on request)
Size: 102 to 705
Toque: 1423 to 156620 Nm
Maximum bore: 260mm
Full gear spacer coupling (For higher DBSE length)
Size: 101 to 105
Torque: 1127 to 14600 Nm
Maximum bore: 110 mm
Drive shaft coupling
Size: 1130 to 2060
Torque: 500 to 3,00,000 Nm
Flange diameter: Up to 180mm
Pin-Bish coupling: (Plain & curved bush)
Size: 105 to 900
Torque: 95 to 1,60,000 Nm
Maximum bore diameter: 305mm
Grid couplings:
Taper grid coupling
Size: 1020 to 1260
Torque: 52 to 9,31,200 Nm
