GS 24 - 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]
24	60	68	75	32	–	–	–	55	27	78	30	–	18	14	2.0	3.0	M 5	10	2.0

The GS 24 Coupling (Size 24) is a heavy-duty, zero-backlash flexible coupling designed for high-performance servo applications and general automation. With an outer diameter of 55mm, the GS 24 represents a significant increase in power capacity over the smaller GS 19, capable of handling nominal torques up to 60 Nm (with 98 ShA spider).

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Key Specifications (Model GS 24)

The GS 24 is a workhorse size for industrial automation. Below are the standard technical specifications:

Parameter	Value
Coupling Size	GS 24 (Size 24)
Nominal Torque	35 Nm (92 ShA Yellow) / 60 Nm (98 ShA Red) / 75 Nm (64 ShD Green)
Max. Torque (Peak)	70 Nm to 150 Nm (approx. 2x Nominal)
Max. Rotational Speed	Up to 14,000 RPM (Standard Hubs)
Bore Range	9 mm to 28 mm (Standard)
Outer Diameter	55 mm
Hub Material	High-Strength Aluminum

How It Works

The GS 24 utilizes a pre-tensioned elastomeric design to guarantee zero backlash:

Interference Fit: The elastomer spider is manufactured slightly wider than the gap between the precision-machined hub jaws. When assembled under pressure, the spider is pre-stressed, removing all clearance and ensuring instant torque transfer.
Vibration Damping: The internal spider acts as a shock absorber. In dynamic applications like rapid reversing of a CNC table, the spider dampens torque spikes and vibrations, protecting the ball screw and motor bearings from wear.
Misalignment Compensation: Despite its high stiffness, the GS 24 can accommodate slight angular, parallel, and axial shaft misalignments, preventing the system from binding due to thermal expansion or assembly errors.

Benefits of GS 24 Couplings

High Torque Capacity: Delivers up to 60 Nm of nominal torque (Red spider), making it suitable for demanding axes in machine tools and packaging lines.
Precision Positioning: The backlash-free connection ensures that the driven load stops exactly where the controller commands, essential for high-quality machining and printing.
Electrical Isolation: The non-conductive spider isolates the motor shaft from the machine bed, protecting sensitive feedback electronics (encoders) from electrical noise.
Plug-In Assembly: The axial "blind mate" design allows for easy installation and inspection, even in restricted spaces inside machine housings.
Low Moment of Inertia: The aluminum hub construction minimizes rotational mass, allowing for high dynamic performance and faster cycle times.

Typical Applications

The GS 24 is widely found in precision industrial sectors:

CNC Machining Centers: Feed axis drives for X, Y, and Z tables.
Robotics: Base and joint actuators for medium-sized industrial robots.
Woodworking Machinery: Positioning drives for saws and routers.
Packaging Industry: Servo drives for cartoners and filling machines.
Material Handling: Precision conveyors and automated storage systems.

Summary

The GS 24 Backlash-Free Coupling is the standard choice for engineers requiring a robust, high-precision connection for torques up to 60 Nm. Its 55mm diameter package offers the stiffness needed for accurate motion control while providing the vibration damping necessary to extend equipment life. Whether in a CNC mill or a high-speed packaging line, the GS 24 ensures reliable, zero-backlash performance.