A Series

Flexible Aluminum Set Screw Couplings

The Helical A Series Flexible Aluminum Couplings meet performance demands across a wide range of applications, including drive systems for encoders, instrumentation, lead screws, small pumps, feed rollers, and other light to medium-duty uses requiring torsional flexibility. As Helical’s most popular coupling, the A Series offers an array of options and diameter sizes, allowing customization to fit specific applications. These couplings require no maintenance, accommodate shaft sizes from 3/32” to 3/4”, and are available in 7075-T6 Aluminum Alloy with a set screw attachment.

Showing 46–60 of 112 results

  • AR075-8-5MM Helical A Series Flexible Aluminum Set Screw Couplings

    AR075-8-5MM

    Outside Diameter: 3/4 in
    Length: 3/4 in
    Major Bore: 1/4 in
    Minor Bore: 5 mm

  • AR075-8-6MM Helical A Series Flexible Aluminum Set Screw Couplings

    AR075-8-6MM

    Outside Diameter: 3/4 in
    Length: 3/4 in
    Major Bore: 1/4 in
    Minor Bore: 6 mm

  • AR075-8-8 Helical A Series Flexible Aluminum Set Screw Couplings

    AR075-8-8

    Outside Diameter: 3/4 in
    Length: 3/4 in
    Major Bore: 1/4 in
    Minor Bore: 1/4 in

  • AR075-8MM-8 Helical A Series Flexible Aluminum Set Screw Couplings

    AR075-8MM-8

    Outside Diameter: 3/4 in
    Length: 3/4 in
    Major Bore: 8 mm
    Minor Bore: 1/4 in

  • AR087-10-10 Helical A Series Flexible Aluminum Set Screw Couplings

    AR087-10-10

    Outside Diameter: 7/8 in
    Length: 7/8 in
    Major Bore: 5/16 in
    Minor Bore: 5/16 in

  • AR087-8-8 Helical A Series Flexible Aluminum Set Screw Couplings

    AR087-8-8

    Outside Diameter: 7/8 in
    Length: 7/8 in
    Major Bore: 1/4 in
    Minor Bore: 1/4 in

  • AR100-10-10 Helical A Series Flexible Aluminum Set Screw Couplings

    AR100-10-10

    Outside Diameter: 1 in
    Length: 1 in
    Major Bore: 5/16 in
    Minor Bore: 5/16 in

  • AR100-10-6.61MM Helical A Series Flexible Aluminum Set Screw Couplings

    AR100-10-6.61MM

    Outside Diameter: 1 in
    Length: 1 in
    Major Bore: 5/16 in
    Minor Bore: 6.61 mm

  • AR100-12-10 Helical A Series Flexible Aluminum Set Screw Couplings

    AR100-12-10

    Outside Diameter: 1 in
    Length: 1 in
    Major Bore: 3/8 in
    Minor Bore: 5/16 in

  • AR100-12-12 Helical A Series Flexible Aluminum Set Screw Couplings

    AR100-12-12

    Outside Diameter: 1 in
    Length: 1 in
    Major Bore: 3/8 in
    Minor Bore: 3/8 in

  • AR100-12-6 Helical A Series Flexible Aluminum Set Screw Couplings

    AR100-12-6

    Outside Diameter: 1 in
    Length: 1 in
    Major Bore: 3/8 in
    Minor Bore: 3/16 in

  • AR100-12-8 Helical A Series Flexible Aluminum Set Screw Couplings

    AR100-12-8

    Outside Diameter: 1 in
    Length: 1 in
    Major Bore: 3/8 in
    Minor Bore: 1/4 in

  • AR100-12MM-8 Helical A Series Flexible Aluminum Set Screw Couplings

    AR100-12MM-8

    Outside Diameter: 1 in
    Length: 1 in
    Major Bore: 12 mm
    Minor Bore: 1/4 in

  • AR100-8-8 Helical A Series Flexible Aluminum Set Screw Couplings

    AR100-8-8

    Outside Diameter: 1 in
    Length: 1 in
    Major Bore: 1/4 in
    Minor Bore: 1/4 in

  • AR112-12-10 Helical A Series Flexible Aluminum Set Screw Couplings

    AR112-12-10

    Outside Diameter: 1 1/8 in
    Length: 1 1/8 in
    Major Bore: 3/8 in
    Minor Bore: 5/16 in

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