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    8-20mm Stainless Steel Bellows Coupling

    The 8 to 12mm bellows shaft couplings have a small size for use in tight spaces and compact applications. Stainless steel couplings with bellows design provide excellent flexibility and compensation for misalignment, which is ideal for use in high precision applications.
    SKU: ATO-BC-4055
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    Delivery date: 6-12 days

    The flexible bellows coupling is a high quality coupling designed for precise and reliable motion transmission. It has a rated torque of 15 Nm at 4200 rpm, an outside diameter of 40 mm and a length of 55 mm. Bellows couplings are easy to install and require minimal maintenance, making them a cost effective solution for users' motion control needs. 


    Model ATO-GRCG-40x55
    Rated Torque 15 Nm
    Allowable Eccentricity 0.2mm
    Allowable Deflection
    Allowable Axial Misalignment +0.7-1.5
    Allowable Speed 4200 rpm
    Static Torsional Stiffness 530 Nm/rad
    Moment of Inertia 2.3x10-5
    Weight 265g

    Dimension (unit: mm)

    Bellows couplings dimension

    d1/d2 ΦD L L1 L2 L3 ΦN F M Tightening Torque
    8-9-9.525-10-11-12-14-15-18-19-20 40 55 11.5 6 20 34.5 5.5 M5 8 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 factors should be considered when selecting a bellows coupling?

    When selecting a bellows coupling, there are several factors that should be considered to ensure it is suitable for the intended application. Some of the key factors to consider include:

    • Torque and Speed Requirements: The torque and speed requirements of the system will determine the size and type of bellows coupling that is needed. It is important to choose a coupling that can handle the maximum torque and speed of the system.
    • Misalignment: Bellows couplings are designed to compensate for misalignment between shafts. The amount of misalignment that the coupling can accommodate will depend on the type and size of the coupling. Make sure to choose a coupling that can accommodate the required level of misalignment.
    • Temperature: The operating temperature of the system will affect the material choice of the bellows coupling. Bellows couplings can be made from a variety of materials including stainless steel, aluminum, and titanium, each with its own temperature limitations.
    • Corrosion and Chemical Resistance: If the system is exposed to corrosive or chemical environments, it is important to choose a bellows coupling that is resistant to these conditions. This may require a different material choice, such as using a corrosion-resistant alloy.
    • Electrical Isolation: In some applications, electrical isolation between shafts may be required. In this case, a bellows coupling made from an insulating material may be necessary.
    • Vibration: The level of vibration in the system can impact the life of the coupling. Choosing a bellows coupling with a high level of torsional stiffness can help to minimize vibration and extend the life of the coupling.
    • Cost: Finally, the cost of the coupling should be considered. Higher quality couplings may have a longer life and require less maintenance, which can ultimately result in cost savings over the lifetime of the system. However, the initial cost of the coupling may be higher.
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