GS19 Coupling 12.7×14 D40XL66 Machined Ready Size

The GS19 Coupling is a high-performance mechanical connection element designed to meet torque transmission and shaft alignment requirements in industrial automation systems. This coupling plays a critical role, especially in applications requiring high dynamic response and precise positioning, such as servo motors, stepper motors, encoders, and gearboxes. Its precisely machined ready sizes for 12.7 mm and 14 mm shaft diameters offer time savings and easy integration during assembly processes. Its compact geometry, with an outer diameter of 40 mm and a total length of 66 mm, provides an effective solution even in systems with limited space. The jaw coupling design ensures zero-backlash torque transmission, allowing for millimeter precision to be maintained, particularly in CNC machines and robotic systems.

The GS19 Coupling not only performs the function of torque transfer but also effectively compensates for potential angular, parallel, and axial misalignments between the driving and driven shafts. This misalignment tolerance reduces stress on system components, extending bearing life and minimizing premature wear. The high-strength aluminum alloy body used in the coupling’s construction provides high torsional rigidity, while the elastic polyurethane spider element dampens shock loads and vibrations, enhancing the overall stability and precision of the system. This combination ensures uninterrupted and reliable performance, especially in industrial environments requiring continuous operation and high speeds. The clamp-type mounting mechanism prevents slippage on the shaft, creating a secure, zero-backlash connection.

Advantages of the GS19 Coupling 12.7X14 D40XL66 Machined Ready Size

Precise and Zero-Backlash Torque Transmission: The GS19 Coupling, thanks to its jaw coupling design and polyurethane intermediate element, provides zero-backlash torque transmission. This feature guarantees that torque is transferred from the drive motor to the load without any loss or delay. This zero-backlash structure is essential for applications where positioning accuracy is critical, such as CNC machines, 3D printers, and robotic systems, ensuring motion control at millimeter and micron levels. It optimizes the system’s response time even during sudden direction changes or high acceleration/deceleration cycles, improving processing quality and repeatability.

Effective Vibration and Shock Damping: The elastic polyurethane spider element in the coupling’s construction is capable of absorbing sudden shock loads and operational vibrations. This damping feature reduces resonance frequencies, especially at high speeds or during rapid acceleration/deceleration cycles, minimizing dynamic stresses on connected mechanical components (motor bearings, lead screws, encoders). Reducing vibrations significantly extends equipment life while also lowering operational noise, providing a more stable and quieter operating environment. This leads to reduced maintenance costs and increased overall system reliability.

Wide Shaft Alignment Tolerance and Easy Integration: The GS19 Coupling effectively tolerates shaft alignment errors that are inevitable in industrial assembly processes. Its capacity to absorb up to 1° angular, 0.2 mm parallel, and 0.2 mm axial misalignments eliminates stresses caused by mounting errors. This prevents premature wear of motor bearings, encoder mounts, and other connected components, extending the overall life of the system. Furthermore, its pre-machined ready sizes for standard industrial shaft diameters like 12.7 mm and 14 mm eliminate the need for additional machining and offer quick and secure installation thanks to the clamp-type mounting, requiring no keyway. This ease of integration shortens commissioning times and optimizes labor costs.

Technical Specifications and Capacity

Feature
Value/Description

Model
GS19 Jaw Coupling

Outer Diameter (D)
40 mm

Total Length (L)
66 mm

Shaft Diameters
12.7 mm x 14 mm (Machined Ready Size)

Body Material
High-Strength Aluminum Alloy

Elastic Element (Spider)
Polyurethane (Standard medium hardness)

Nominal Torque Capacity
3.5 Nm

Maximum Torque Capacity
7 Nm

Maximum Speed
10,000 RPM

Operating Temperature
-20°C to +80°C

Mounting Type
Clamp Type – Secured to shaft with screws, zero-backlash connection

Angular Misalignment Tolerance
≤ 1° (Maximum)

Parallel Misalignment Tolerance
≤ 0.2 mm (Maximum)

Axial Misalignment Tolerance
≤ 0.2 mm (Maximum)

Application Compatibility
NEMA 23/34 Step/Servo Motors, Encoders, Lead Screws

Technical Frequently Asked Questions (FAQ)

What advantages does the zero-backlash structure of the GS19 Coupling offer in precision positioning systems?

A zero-backlash coupling ensures no angular delay or loss during torque transmission from the drive motor to the load. This is critical in applications requiring high positioning accuracy, such as CNC machines, robotic arms, and precision measuring instruments. The absence of backlash ensures that the system responds instantly and accurately to every pulse or command signal. This allows for millimeter-level precision in tool paths, improves machining quality, ensures repeatability, and optimizes the overall control performance of the system. Backlash in traditional couplings can lead to positioning errors and vibrations, especially during direction changes or sudden load applications, whereas the GS19’s zero-backlash design completely eliminates these negative effects.

How do the body material and elastic element selection of the GS19 Coupling affect its performance?

The body of the GS19 Coupling is made from a high-strength aluminum alloy. This material choice provides the coupling with high torsional rigidity and low inertia. High rigidity ensures minimal deformation during torque transmission, maintaining precision, while low inertia allows the motor to accelerate and decelerate faster, increasing energy efficiency in dynamic systems. The polyurethane spider used as the elastic element effectively dampens shock loads and vibrations, reducing the system’s resonance frequencies. The flexible structure of the polyurethane tolerates shaft alignment errors while exhibiting high resistance to wear and tear. This material combination ensures that the coupling operates reliably under high torque and has damping capacity that extends the life of connected components.

What do the specified shaft alignment tolerances (angular, parallel, axial) mean for the overall life and performance of the system?

The specified angular (≤ 1°), parallel (≤ 0.2 mm), and axial (≤ 0.2 mm) alignment tolerances of the GS19 Coupling are designed to minimize the adverse effects of minor misalignments that occur during assembly in industrial applications. Within these tolerances, the coupling’s flexible structure absorbs stress in the shafts and prevents it from being transmitted to the connected components (motor bearings, lead screw bearings, encoders). If a coupling cannot compensate for such alignment errors, excessive radial and axial loads will occur on the shafts. These loads lead to premature wear in bearings, damage to motor and encoder mounts, shaft breakages, and a shortened overall system lifespan. The wide tolerances of the GS19 ensure long-term reliability and operational efficiency of the system while providing ease of assembly.

What technical advantages does the clamp-type mounting of the GS19 Coupling offer compared to keyed connections?

The clamp-type mounting of the GS19 Coupling provides a zero-backlash connection by applying uniform and homogeneous clamping force on the shaft. In traditional keyed connections, there is always a risk of some backlash due to tolerances between the key and keyway. This backlash can cause delays in torque transmission and positioning errors, especially during direction changes or high dynamic loads. The clamp type completely grips the circumference of the shaft, eliminating this backlash and transmitting torque through friction. Furthermore, it eliminates the need for machining a keyway, preserving the shaft’s strength, reducing stress concentrations, and lowering the risk of shaft breakage. Its installation is faster and easier, requires no special tools, and does not cause any damage to the shaft. These features offer critical technical advantages, especially for precise and high-performance industrial automation applications.

Mermak has 16 years of experience in the industrial automation sector. Our products are stocked and prepared from our Ankara Uzay Sanayi factory/warehouse. Website stock quantities and prices are up-to-date. Stocked products are dispatched directly from our warehouse without production waiting times. We ensure careful packaging and meticulous follow-up of invoices and documents. We work with reliable logistics partners, and the Mermak team closely monitors the shipment process. Upon request, we can arrange product videos or factory viewings via WhatsApp or other contact channels. We proudly supply our products to numerous countries including the United Kingdom, United States, Canada, Australia, Ireland, New Zealand, and South Africa, as well as similar international markets.