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    8-15mm Stainless Steel Bellows Coupling

    8 to 15mm flexible bellows couplings are available for connecting stepper motors and screw encoders. The couplings are made of high quality stainless steel and are laser welded between the bellows and the shaft sleeve for forward and reverse rotation. Lightweight bellows coupling is designed for easy installation and maintenance and is perfect for a wide range of applications from medical equipment to heavy industrial machinery.
    SKU: ATO-BC-3242
    30-day Returns
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    Delivery date: 6-12 days

    High quality metal bellow coupling has a rated torque of 3.7 Nm at 4700 rpm, with shaft diameters ranging from 8 to 15 mm. This flexible coupling is simple in construction and easy to machine and install, and is widely used in medical equipment, test benches, wind turbines, servo shafts in machine tools, wood processing machinery, and other equipment.


    Model ATO-GRCG-32x42
    Rated Torque 3.7 Nm
    Allowable Eccentricity 0.2mm
    Allowable Deflection
    Allowable Axial Misalignment +0.5-1.3
    Allowable Speed 4700 rpm
    Static Torsional Stiffness 490 Nm/rad
    Moment of Inertia 2.1x10-5
    Weight 130g

    Dimension (unit: mm)

    Bellows couplings dimension

    d1/d2 ΦD L L1 L2 L3 ΦN F M Tightening Torque
    8-9-9.525-10-11-12-14-15 32 42 8 4 18 27.2 4.5 M4 3.5 Nm

    Keyway Machining Dimensions Comparison Table

    Keyway machining standard drawing

    Shaft Size Keyway Standard Processing Size Keyway Size
    d1/d2 b t bxh
    Slot Width Tolerance Grooving Depth Tolerance
    φ6-φ7.9 2 ±0.0125 1 ±0.10 2x2
    φ8-φ10 3 ±0.0150 1.4 3x3
    φ10.1-φ12 4 1.8 4x4
    φ12.1-φ17 5 2.3 5x5
    φ17.1-φ22 6 ±0.0180 2.8 6x6
    φ22.1-φ30 8 3.3 ±0.20 8x8
    φ30.1-φ38 10 ±0.0215 3.3 10x10
    φ38.1-φ44 12 3.8 12x12
    φ44.1-φ50 14 4.3 14x14
    φ50.1-φ58 16 4.4 16x16
    φ58.1-φ65 18 4.4 18x18


    Bellows couplings are commonly used in robotics, medical equipment, semiconductor manufacturing, and aerospace industries. Bellows couplings can transmit torque and rotational motion while compensating for misalignments, which makes them ideal for applications where high accuracy and repeatability are critical.

    Bellows couplings applications

    Tips: What are the common applications of bellows couplings?

    Bellows couplings are flexible couplings that use a thin-walled, corrugated metal bellows to transmit torque and compensate for axial, angular, and radial misalignments between rotating shafts. They are commonly used in various industrial applications that require precise positioning, high accuracy, and low backlash, such as motion control systems, robotics, semiconductor manufacturing, medical equipment, and aerospace.

    Some of the common applications of bellows couplings are:

    • Precision positioning systems: Bellows couplings provide high torsional stiffness and low inertia, which make them ideal for use in precision linear and rotary motion stages, such as those used in laser cutting, metrology, and inspection systems.
    • Robotics: Bellows couplings can withstand high levels of vibration and shock and can compensate for misalignments caused by the movement of robotic arms and joints. They are often used in robotic manipulators, grippers, and end-effectors.
    • Semiconductor manufacturing: Bellows couplings are used in semiconductor equipment, such as wafer handling robots, to ensure precise positioning and alignment of delicate components.
    • Medical equipment: Bellows couplings are used in medical equipment, such as MRI machines and surgical robots, to provide accurate positioning and reduce vibration and noise.
    • Aerospace: Bellows couplings are used in aerospace applications, such as satellite thrusters and gyroscopes, to transmit torque and compensate for misalignments caused by changes in temperature and pressure.

    Overall, bellows couplings are versatile and reliable components that provide precise motion control in a wide range of industrial applications.

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