GS 90 - 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]
90	3600	–	4500	110	–	–	160	200	104	245	100	62	45	34	5.5	6.5	M 12	30	40

The GS 90 Coupling (Size 90) is the giant of the high-precision flexible coupling range, designed for the most punishing heavy-duty applications where zero backlash is non-negotiable. With an impressive outer diameter of 200mm, the GS 90 is engineered to transmit colossal torque loads—nominally 3,600 Nm with a standard Red spider—making it the ultimate solution for massive servo drives and industrial gearboxes.

Enquire Now

Key Specifications (Model GS 90)

The GS 90 represents the pinnacle of standard heavy-duty precision couplings. Below are the typical technical specifications:

Parameter	Value
Coupling Size	GS 90 (Size 90)
Nominal Torque	3,600 Nm (98 ShA Red) / 4,950 Nm (64 ShD Green)
Max. Torque (Peak)	7,200 Nm to 9,900 Nm (approx. 2x Nominal)
Max. Rotational Speed	Up to 2,000 RPM (Material dependent)
Bore Range	50 mm to 120 mm (Standard)
Outer Diameter	200 mm
Hub Material	Steel or Spheroidal Graphite Iron

How It Works

The GS 90 employs a massive scale version of the pre-tensioned principle to ensure absolute precision:

Rigid Steel Construction: To handle forces exceeding 3,000 Nm, the hubs are machined from high-grade steel. The concave jaws are designed to withstand immense shear forces without deforming.
Zero Backlash Pre-Load: The heavy-duty elastomer spider is sized to be wider than the jaw gap. It is pressed into place under high force, creating a permanent interference fit that eliminates mechanical play entirely.
Damping & Protection: The spider serves as a sacrificial element that absorbs high-energy torque spikes and torsional vibrations, protecting the expensive motor shaft and gearbox internals from shock damage.

Benefits of GS 90 Couplings

Colossal Torque Capacity: Delivers 3,600 Nm of nominal torque (Red spider) and nearly 5,000 Nm with a Green spider, enabling precise control of the heaviest industrial machinery.
Extreme Stiffness: The steel design minimizes torsional wind-up, ensuring that large-scale positioning commands are executed with near-perfect accuracy.
Electrical Isolation: The polyurethane spider provides electrical separation between the drive and the load, protecting sensitive control systems from ground currents.
Blind Assembly: The axial "plug-in" design simplifies the installation process, allowing the drive unit to be mated to the machine without complex tools.
Vibration Management: effectively dampens the severe vibrations often present in heavy crushing, pressing, or shredding applications.

Typical Applications

The GS 90 is utilized in the most demanding sectors of heavy industry:

Heavy Metal Forming: Main drives for massive servo presses and forging machines.
Test Benches: High-torque testing rigs for wind turbine gearboxes and ship engines.
Mining & Crushing: Precision drives for high-value crushers and shredders requiring shock protection.
Steel Mills: Heavy-duty roller drives and coil handling equipment.
Plastic Extrusion: Main screw drives for large-scale compounding extruders.

Summary

The GS 90 Backlash-Free Coupling is the definitive choice for heavy-duty precision power transmission. Capable of handling nominal torques up to 4,950 Nm and peak loads approaching 10,000 Nm, it combines the brute strength of steel with the zero-backlash precision of a servo coupling. For engineers designing the largest automated machinery, the GS 90 offers the ultimate balance of rigidity, power, and protection.