GS 48 - AXIS GS Couplings

GS standard types - For size 5 to 38 hub material aluminium/for size 42 to 90 hub material steel
Size	Spider GS ¹⁾ torque T_KN [Nm]			D_max. for hub type			Dimensions [mm]										Setscrew DIN EN ISO 4029
Size	98 ShA	57 ShD	64 ShD	1.0	1.1	1.2	DN	DH	DI1	L	L1, L2	M, N	E	B1	S	A	G	T	TA [Nm]
48	525	590	655	62	–	–	95	105	51	140	56	32	28	21	3.5	4.0	M 8	20	10

The GS 48 Coupling (Size 48) is a powerful, heavy-duty flexible coupling engineered for high-end servo drives and industrial machinery requiring massive torque transmission with zero backlash. With an outer diameter of 105mm, the GS 48 is designed to handle extreme loads, offering nominal torque capacities exceeding 500 Nm (with a standard 98 ShA spider).

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Key Specifications (Model GS 48)

The GS 48 is a standard size for heavy industrial servo applications. Below are the typical technical specifications:

Parameter	Value
Coupling Size	GS 48 (Size 48)
Nominal Torque	310 Nm (92 ShA Yellow) / 525 Nm (98 ShA Red) / 655 Nm (64 ShD Green)
Max. Torque (Peak)	620 Nm to 1,310 Nm (approx. 2x Nominal)
Max. Rotational Speed	Up to 7,000 RPM (Hub material dependent)
Bore Range	25 mm to 62 mm (Standard)
Outer Diameter	105 mm
Hub Material	Steel or High-Strength Aluminum

How It Works

The GS 48 utilizes a robust pre-tensioned design to ensure backlash-free operation under heavy loads:

Zero Backlash Fit: The elastomeric spider is dimensionally larger than the precision-machined hub jaws. Upon assembly, the spider is compressed under high force, creating a tight interference fit that eliminates all mechanical clearance.
High-Torque Transmission: The concave jaw profile maximizes the contact area with the spider teeth. This allows the GS 48 to transmit massive torque loads and resist deformation during high-speed reversing.
Vibration Damping: The internal spider acts as a heavy-duty buffer. It absorbs torsional vibrations and shock loads, protecting large motor shafts, gears, and ball screws from resonance and fatigue.

Benefits of GS 48 Couplings

Extreme Torque Capacity: Capable of transmitting over 500 Nm of nominal torque in a 105mm package, providing the power density required for heavy machinery axes.
Precision Accuracy: The zero-backlash connection ensures that heavy loads are positioned with exact repeatability, which is critical for large-format machining and printing.
Electrical Isolation: The polyurethane spider electrically isolates the driving and driven shafts, preventing ground loops and protecting sensitive control electronics.
Easy Assembly: The axial "blind mate" design allows for simple installation in confined spaces, such as inside large bell housings.
Customizable Performance: Engineers can select different spider hardness levels (e.g., 98 Shore A for stiffness, 64 Shore D for maximum torque) to optimize the drive system.

Typical Applications

The GS 48 is employed in the heaviest sectors of precision automation:

Heavy CNC Machines: Main spindle drives and large gantry feed axes.
Injection Molding: High-force electric clamping units and screw drives.
Printing Presses: Main drive lines for large offset and flexo presses.
Metal Forming: Servo-driven stamping presses and bending machines.
Material Handling: Heavy-duty lift systems and automated storage cranes.

Summary

The GS 48 Backlash-Free Coupling is the robust solution for engineers dealing with heavy loads and high precision requirements. With a nominal capacity of up to 525 Nm (Red spider) and zero backlash, it offers the stiffness and reliability needed for large-scale industrial machinery. Its ability to absorb shock loads while maintaining accurate positioning makes it a cornerstone component for heavy-duty automation.