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	A-Series

Features A Series - Aluminum Light to medium duty Non-magnetic Economical No maintenance The A Series 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/coupler is required.  Helical's most popular coupling.

Features of the A Series Relevant Links & Charts 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 Series to your specific applications. A Series options include set screw or integral clamp attachments and inch or metric bores. ACR (Clamp) Series Chart AR (Set Screw) Series Chart A Series Special Bore Configurations Standard Coupling Guide

Attachment Methods Integral Clamp / ACR Set Screw / AR (two each end @ 120°) Internal Configuration Relief * Major and minor diameter shafts may enter flexure area during operation * Dark areas indicate relief within the coupling interior

How to Order Coupling part numbers consist of four sections. To determine the correct numbers/letters for each section of a specific coupling part number, please refer to the instructions on the right.   Example ** Refer to "Standard Bore Diameters" section in chart 1. Basic Model Number:      Choose material and attachment method.     ACR = Aluminum, Integral Clamp     AR =   Aluminum, Set Screw     2. Outside Diameter Designator: This three-digit number represents the coupling outside diameter. Based on the Performance Data in the middle of the chart, select the Outside Diameter Designator by moving left to the appropriate diameter. 3. Major Bore Designator: The larger of the two bores, its diameter is expressed in either 32nds of an inch (-8 equals 1/4 inch) or in millimeters (6mm). Please review your selection to determine if both bores can be made in the size coupling you have selected in 2. It is important that the larger bore be stated first. 4. Minor Bore Designator: The smaller of the two bores is expressed the same as the Major Bore Designator. Either bore can be inch or mm.