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Contact USA Inside SalesCatherine Topar
Ph: 203-334-7537
Fx: 203-334-7792
Email: ctopar@e-jpc.com
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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 specificmore
Unit of Measure

Product Type

Coupling

Series

AR

Type

Set Screw Attachment

Material

7075-T6 Aluminum Alloy

Finish

Clear Anodize

Outside Diameter Designator

125

Outside Diameter (D)

1 1/4 in

Length (L)

1.25 in

Size (+0.002 in/-0.000 in)

0.625 in15.88 mm

Bore Designator

20
Momentary Dynamic Torque1 29 lb·in

Torsional Rate

0.37 degree/lb·in
Inertia2 6.9 x 10-5 lb.in.sec2
Screw Size3 1/4 - 20

Seating Torque

65 lb·in

Center Line

0.16 in

Min. Size

0.313 in7.94 mm

Max. Size

0.625 in15.88 mm

Max. Bore Diameter

0.669 in17.00 mm

Bore Depth

0.51 in12.95 mm

Note

  1. Shaft misalignments:
    Angular 5 degrees
    Parallel Offset 0.030 in. (0.060 in. T.I.R)
    Axial Motion ±0.010 in.
  2. Manufacturing dimensional tolerances unless otherwise specified are:
    fraction ± 1/64
    x.xx ± .01 in.
  3. With integral clamp attachments only, this bore size requires an operating clearance diameter greater than coupling outside diameter.
  • 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.
  • 2 Inertia is based on smallest standard bore diameter.
  • 3 Metric Fasteners available on request