GS 42 - 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]
42	450	495	560	55	–	–	85	95	46	126	50	28	26	20	3.0	4.0	M 8	20	10

The GS 42 Coupling (Size 42) is a high-performance, heavy-duty servo coupling designed for demanding industrial applications where high torque transmission and zero backlash are critical. With an outer diameter of 95mm, the GS 42 offers a substantial torque capacity of up to 450 Nm (with a 98 ShA spider), making it ideal for moving heavy loads with precision.

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Key Specifications (Model GS 42)

The GS 42 is designed for heavy servo motors and dynamic load applications. Below are the standard technical specifications:

Parameter	Value
Coupling Size	GS 42 (Size 42)
Nominal Torque	265 Nm (92 ShA Yellow) / 450 Nm (98 ShA Red) / 560 Nm (64 ShD Green)
Max. Torque (Peak)	530 Nm to 1,120 Nm (approx. 2x Nominal)
Max. Rotational Speed	Up to 8,000 RPM (Standard Hubs)
Bore Range	20 mm to 55 mm (Standard)
Outer Diameter	95 mm
Hub Material	High-Strength Aluminum or Steel

How It Works

The GS 42 utilizes a pre-tensioned elastomeric system to guarantee zero backlash:

Zero Backlash Fit: The elastomer spider is dimensionally larger than the gap between the hub jaws. Upon assembly, the spider is compressed under high pressure, creating a tight interference fit that eliminates all clearance.
High-Torque Transfer: The curved jaw profile concentrates compression toward the center of the spider teeth. This allows the coupling to transmit heavy torque loads without deformation, ensuring rigid performance during rapid starts and stops.
Vibration Damping: The internal spider acts as a mechanical filter. It absorbs torsional vibrations and shock loads, protecting heavy-duty ball screws, gearboxes, and motor bearings from fatigue and resonance.

Benefits of GS 42 Couplings

High Power Density: Capable of transmitting 450 Nm of nominal torque in a compact 95mm diameter, providing the strength needed for heavy machine axes.
Positioning Accuracy: The zero-backlash connection ensures that large loads stop exactly where commanded, essential for precision machining and printing quality.
Electrical Isolation: The polyurethane spider electrically isolates the driving and driven shafts, preventing ground currents from interfering with sensitive feedback systems.
Blind Assembly: The axial "plug-in" design allows for easy installation in difficult-to-reach areas, such as inside bell housings or motor mounts.
Customizable Stiffness: By selecting different spider hardness levels (e.g., 92 Shore A for damping, 98 Shore A for stiffness), engineers can tune the drive system's dynamic behavior.

Typical Applications

The GS 42 is widely used in heavy industrial automation and manufacturing:

Heavy CNC Machines: Main spindle drives and large feed axes (X, Y, Z) for gantries.
Injection Molding: Electric screw drives and clamping unit actuation.
Printing Presses: Main drive shafts for offset and flexographic printing machines.
Presses & Forming: Servo-driven metal forming and stamping presses.
Material Handling: Heavy-duty palletizers, lifts, and automated guided vehicles (AGVs).

Summary

The GS 42 Backlash-Free Coupling is the heavy-duty choice for engineers needing high torque and precision. With a capacity of up to 450 Nm and zero backlash, it offers the rigidity and reliability required for large-scale industrial machinery. Its ability to dampen vibrations while maintaining accurate positioning makes it a critical component for high-performance heavy automation.