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    4-8mm Stainless Steel Bellows Coupling

    A small size bellows coupling is made of high quality stainless steel material with high corrosion resistance. The coupling shaft diameter has 4-8mm, outer diameter 16mm and length 27mm. Bellows couplings offer excellent accuracy, smooth operation and long service life, making them ideal for a wide range of industrial and commercial applications.
    SKU: ATO-BC-48
    30-day Returns
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    Delivery date: 6-12 days

    High precision bellows coupling has a rated torque of 1.2 Nm and a speed of 9400 rpm, with shaft diameters ranging from 4 to 8 mm. Flexible bellows couplings are widely used in medical equipment, test benches, wind turbines, and servo shafts in machine tools.


    Model ATO-GRCG-16x27
    Rated Torque 1.2 Nm
    Allowable Eccentricity 0.1mm
    Allowable Deflection 1.5°
    Allowable Axial Misalignment +0.3-1
    Allowable Speed 9400 rpm
    Static Torsional Stiffness 150 Nm/rad
    Moment of Inertia 8.0x10-7
    Weight 26g

    Dimension (unit: mm)

    Bellows couplings dimension

    d1/d2 ΦD L L1 L2 L3 ΦN F M Tightening Torque
    4-5-6-6.35-7-8 16 27 7.5 2 8 13.5 3 M2.5 1 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 is a bellows coupling?

    A bellows coupling is a type of flexible coupling used to transmit torque and motion between two rotating shafts that are slightly misaligned or not precisely aligned. It consists of a series of thin metal bellows arranged in a circular shape, with two flanges or hubs attached to each end.

    The bellows are made of thin metal sheets, usually stainless steel, that are welded together in a convoluted shape. This allows them to expand and contract, while maintaining their shape and stiffness, which makes them ideal for coupling applications.

    When installed between two shafts, the bellows coupling allows for a small amount of misalignment or axial motion between them, while still transmitting torque with high accuracy and minimal backlash. It can also help to dampen vibration and shock loads, which can help to reduce wear and tear on the system.

    Bellows couplings are commonly used in applications where precise motion control is required, such as robotics, CNC machines, and semiconductor manufacturing equipment. They are also used in aerospace, medical, and other industries where high reliability and precision are critical.

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