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    15-38mm Stainless Steel Bellows Coupling

    This flexible bellows coupling has a high torque capacity with shaft sizes from 15 to 38 mm, rated torque of 33 Nm and an allowable speed of 3900 rpm. ATO stainless steel bellows couplings are designed for precise and reliable motion transmission.
    SKU: ATO-BC-9581
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    Delivery date: 6-12 days

    High precision stainless steel bellows coupling has an outside diameter of 65 mm, a length of 81 mm and a shaft diameter size of 15-38 mm. The flexible bellows coupling coupling has a simple structure, small external dimensions, easy processing and installation, and is mainly used in small power precision machinery and control mechanisms that require compact structure and high transmission accuracy.


    Model ATO-GRCG-65x81
    Rated Torque 80 Nm
    Allowable Eccentricity 0.2mm
    Allowable Deflection
    Allowable Axial Misalignment +0.7-1.5
    Allowable Speed 3500 rpm
    Static Torsional Stiffness 900 Nm/rad
    Moment of Inertia 3.6x10-5
    Weight 1000g

    Dimension (unit: mm)

    Bellows couplings dimension

    d1/d2 ΦD L L1 L2 L3 ΦN F M Tightening Torque
    810-11-12-14-15-18-19-20-22-24-25-28-30-35-38 65 81 19.5 7 28 60.5 10.5 M6 13 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: How to maintain a bellows couplings?

    Bellows couplings are designed to provide flexibility and compensate for misalignment in various mechanical systems. To maintain a bellows coupling and ensure its proper functioning, the following steps can be taken:

    • Keep the coupling clean and free from debris. Any dirt, dust, or other particles can cause damage to the coupling and lead to premature failure.
    • Inspect the coupling periodically to identify any signs of wear or damage. This can include cracks, corrosion, or distortion of the bellows.
    • Lubricate the coupling regularly to prevent corrosion and ensure smooth operation. Follow the manufacturer's recommendations for lubrication.
    • Avoid overloading the coupling or exceeding its torque and speed limits. This can cause excessive stress and damage the bellows.
    • Ensure proper alignment between the connected shafts. Misalignment can cause excessive stress and wear on the bellows.
    • Use the coupling within its specified temperature range. Extreme temperatures can cause damage to the bellows and reduce its lifespan.

    By following these maintenance steps, the bellows coupling can provide reliable and efficient performance for a long time.

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