GS 5 - 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]
5	0.9	–	–	–	6	6	–	10	–	15	5	–	5	4	0.5	4.0	M 2	2.5	0.35

The GS 5 Coupling (often designated as Size 05) is a high-precision, zero-backlash flexible shaft coupling designed for servo and motion control applications. Unlike standard industrial jaw couplings (like the L-Series), the GS 5 features curved jaws and a pre-stressed elastomer spider that eliminates play, ensuring precise positioning accuracy for sensitive equipment.

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Key Specifications (Model GS 5)

The GS 5 is the smallest standard size in the high-precision GS range. Below are the technical specifications:

Parameter	Value
Coupling Size	GS 5 (Size 05)
Nominal Torque	0.5 Nm to 1.2 Nm (Depends on Spider Hardness)
Max. Rotational Speed	Up to 47,000 RPM (Balanced)
Bore Range	2mm to 5mm
Outer Diameter	10 mm
Hub Material	High-Strength Aluminum

How It Works

The GS 5 utilizes a "curved jaw" design that differs from standard straight-jaw couplings.

Zero Backlash: The elastomer spider is sized slightly larger than the gap between the metal jaws. When assembled, the spider is compressed (pre-stressed), creating a tight fit that eliminates any gap or "play" between the driving and driven hubs.
Torque Transmission: Rotary motion is transmitted through the pressure of the aluminum jaws against the spider legs. The curved profile concentrates the load towards the center of the spider tooth, allowing for higher torque density.
Misalignment Compensation: Despite the tight fit, the polyurethane spider can deform to accommodate slight angular, parallel, and axial misalignment without damaging the connected bearings.

Benefits of GS 5 Couplings

Positioning Accuracy: The backlash-free design ensures that the driven shaft moves exactly in sync with the motor, which is critical for 3D printers, robotics, and CNC machines.
High Speed: The lightweight aluminum hubs have very low inertia, allowing for rapid starts, stops, and reversing at high speeds (up to 40k+ RPM).
Compact Size: With an outer diameter of only 10mm, it is one of the smallest flexible couplings available, perfect for miniaturized electronics.
Electrical Isolation: The non-conductive spider prevents electrical currents from traveling between the motor and the encoder, protecting delicate electronics.
Variable Stiffness: Spiders are available in different hardness levels (e.g., 80 ShA Blue, 92 ShA Yellow, 98 ShA Red) to tune the damping and stiffness of the drive.

Typical Applications

The GS 5 is the standard choice for precision micro-drives:

Encoders & Resolvers: Connecting feedback devices to motor shafts.
Medical Equipment: Precision pumps and diagnostic scanners.
3D Printers: Z-axis lead screw connections.
Robotics: Small joint actuators and grippers.
Instrumentation: Metrology and optical adjustment devices.

Summary

The GS 5 Backlash-Free Coupling is the ideal solution for applications where precision is paramount. Providing a nominal torque of up to ~1.2 Nm in a tiny 10mm diameter package, it offers the perfect combination of stiffness, vibration damping, and zero backlash. For engineers designing compact motion control systems, the GS 5 ensures accuracy and reliability without the bulk of industrial couplings.