GS 65 - 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]
65	940	1055	1175	80	–	–	115	135	68	185	75	47	35	26	4.5	4.5	M 10	20	17

The GS 65 Coupling (Size 65) is a high-capacity, zero-backlash flexible coupling designed for the most demanding heavy-duty servo applications. With an outer diameter of 135mm and standard steel hubs, the GS 65 is engineered to transmit immense torque loads (up to 940 Nm with a standard Red spider) without any mechanical play.

Enquire Now

Key Specifications (Model GS 65)

The GS 65 is a robust solution for large-scale industrial automation. Below are the standard technical specifications:

Parameter	Value
Coupling Size	GS 65 (Size 65)
Nominal Torque	625 Nm (92 ShA Yellow) / 940 Nm (98 ShA Red) / 1,175 Nm (64 ShD Green)
Max. Torque (Peak)	1,250 Nm to 2,350 Nm (approx. 2x Nominal)
Max. Rotational Speed	Up to 4,500 RPM (Standard Steel Hubs)
Bore Range	35 mm to 75 mm (Standard)
Outer Diameter	135 mm
Hub Material	Steel (Standard)

How It Works

The GS 65 uses a heavy-duty pre-tensioning system to eliminate backlash:

Steel Hub Construction: Given the high forces involved, the GS 65 uses steel hubs instead of aluminum. These hubs feature precision-milled concave jaws that interlock with the elastomer spider.
Zero Backlash Pre-Load: The elastomer spider is dimensionally wider than the jaw gap. When assembled under high pressure, the spider is compressed, creating a pre-loaded interference fit that removes all backlash.
Rigid Torque Transfer: The steel jaws provide a rigid platform that does not deform under load, ensuring that the high torque from the motor is transferred instantly to the driven load.

Benefits of GS 65 Couplings

Extreme Torque Density: Capable of transmitting nearly 1,000 Nm of nominal torque (Red spider) in a 135mm package, making it suitable for heavy press lines and large machining centers.
High Stiffness: The combination of steel hubs and a hard elastomer spider (e.g., 64 Shore D) provides the torsional rigidity needed to prevent "wind-up" in long ball screws or shafts.
Vibration Damping: Despite its strength, the internal spider absorbs shock loads and torsional vibrations, protecting expensive gearboxes and motor bearings from impact damage.
Electrical Isolation: The polyurethane spider electrically isolates the driving and driven shafts, preventing ground currents from interfering with the servo motor's feedback loop.
Serviceability: The axial "blind mate" design allows the coupling to be assembled and disassembled without removing the motor or gearbox, simplifying maintenance.

Typical Applications

The GS 65 is deployed in heavy engineering and processing industries:

Metal Forming: Main drives for servo-electric stamping presses and folding machines.
Large CNC Gantries: Axis drives for aerospace milling machines and boring mills.
Printing & Converting: Main drive shafts for large-width flexographic and gravure printing presses.
Plastics Machinery: Electric clamping units for large injection molding machines.
Material Handling: Heavy-duty automated storage cranes and lift systems.

Summary

The GS 65 Backlash-Free Coupling is the ultimate component for heavy-duty precision motion control. With a nominal torque capacity of 940 Nm (Red spider) and the durability of steel hubs, it offers the uncompromising strength required for moving massive industrial loads. Its ability to maintain zero backlash while absorbing dangerous shock loads makes it an industry standard for high-performance heavy automation.