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  • Light to medium duty
  • Non-magnetic
  • Economical
  • No maintenance
The A Series coupling meets performance demands over a wide range of applications, including drive systems for encoders, instrumentation, lead screws, small pumps, feed rollers and anywhere a light to medium duty, torsionally flexible coupling is required. Helical's most popular coupling.

  • No maintenance
  • Shaft sizes from 3/32 to 3/4
An array of options, in a variety of diameter sizes, allows you to tailor the A or H Series to your specific applications. A and H Series options include set screw or integral clamp attachments and inch or metric bores.

Helical A Series Aluminum Couplings

Unit of Measure

Product Type

N/A Coupling




N/A Integral Clamp Attachment


N/A 7075-T6 Aluminum Alloy


N/A Clear Anodize

Outside Diameter Designator

N/A 037
Momentary Dynamic Torque1 N/A 0.03 lb·in

Max. Bore Diameter

N/A 2.00 mm


N/A 0.0787 in

Max. Torque

N/A 1.11
  • 1 Dynamic torque ratings are momentary values. For non-reversing applications, divide by 2. Divide by 4 for reversing applications. Should the torque ratings be marginal for your application.