GS 75 - 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]
75	1920	–	2400	95	–	–	135	160	80	210	85	53	40	30	5.0	5.0	M 10	25	17

The GS 75 Coupling (Size 75) is a massive, ultra-heavy-duty servo coupling designed for the most extreme precision power transmission tasks. With an outer diameter of 160mm and robust steel or spheroidal cast iron hubs, the GS 75 is capable of transmitting colossal torques—up to 2,080 Nm with a standard Red spider—while maintaining absolutely zero backlash.

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Key Specifications (Model GS 75)

The GS 75 is built for the top tier of heavy industrial automation. Below are the standard technical specifications:

Parameter	Value
Coupling Size	GS 75 (Size 75)
Nominal Torque	2,080 Nm (98 ShA Red) / 2,900 Nm (64 ShD Green)
Max. Torque (Peak)	4,160 Nm to 5,800 Nm (approx. 2x Nominal)
Max. Rotational Speed	Up to 3,000 RPM (Material dependent)
Bore Range	40 mm to 95 mm (Standard)
Outer Diameter	160 mm
Hub Material	Steel or Spheroidal Graphite Iron

How It Works

The GS 75 utilizes a heavy-duty pre-tensioned design to ensure backlash-free operation under extreme loads:

Rigid Hub Construction: Due to the immense forces involved, the GS 75 uses high-strength steel or nodular iron hubs. These feature precision-machined concave jaws that interlock with the elastomer spider.
Zero Backlash Pre-Load: The massive elastomer spider is dimensionally wider than the jaw gap. Upon assembly, it is compressed under high pressure, creating a pre-loaded interference fit that eliminates all mechanical play.
Shock Absorption: The internal spider acts as a giant buffer. It absorbs high-energy shock loads and torsional vibrations, protecting large motor shafts, gearboxes, and screws from fatigue failure.

Benefits of GS 75 Couplings

Extreme Torque Capacity: Capable of transmitting over 2,000 Nm of nominal torque (Red spider), making it suitable for the largest electric drives in manufacturing.
High Torsional Stiffness: The steel construction minimizes deformation under load, ensuring that the driven mass follows the motor's position commands accurately.
Electrical Isolation: The polyurethane spider electrically isolates the driving and driven shafts, preventing ground currents from damaging sensitive motor feedback systems.
Maintenance Free: Once installed, the coupling requires no lubrication or maintenance, reducing operational costs in heavy industrial environments.
Blind Assembly: The axial "plug-in" design allows for easy installation and separation of the drive train, even in confined spaces.

Typical Applications

The GS 75 is used exclusively in heavy-duty precision applications:

Metal Forming: Main drives for large servo presses and heavy bending machines.
Test Benches: High-torque dynamometers for engine and turbine testing.
Plastics Machinery: Extruder drives and electric clamping units for massive injection molders.
Shredding & Crushing: Precision shredders and recycling machinery requiring shock protection.
Steel Industry: Feed rolls and positioning drives in rolling mills.

Summary

The GS 75 Backlash-Free Coupling is the powerhouse solution for heavy precision engineering. With a nominal torque rating of over 2,000 Nm and the durability of steel hubs, it offers the strength required to move massive industrial loads with zero backlash. Its ability to combine extreme rigidity with vibration damping makes it the critical link in high-performance heavy machinery.