Measurement and Control Systems
    The torsional stiffness of the GS Series coupling provides zero backlashes needed for the accuracy for measurement and control systems. The low torques of these applications give the GS Series the ability to provide zero backlashes due to the elastomeric pre-stress.
Servo and Positioning Drives
    The GS Series provides a zero backlash, flexible connection for servo and positioning drives. An added benefit of the GS Series is its damping capabilities.
    For applications that have vibrations at critical speeds, the GS Series coupling can provide a zero backlash solution for vibration problems.
Main Spindle Drives
    The GS Series coupling is used in main spindle drives for machine tools. Torque spikes and cyclical loading are handled by the GS Series by damping or by shifting the vibratory frequency range to a non-critical speed range.
The GS Series can be used in a variety of different applications requiring precision and accuracy.

The GS Series spider features a straight center of the spider tooth, providing higher stiffness due to coupling prestress. The crowning of the ends of the spider legs allows for misalignment, while the curved jaws and solid spider center provide high-speed capability.The jaws of the hubs and the spider legs are chamfered to provide easy assembly. The GS Series coupling design also allows the blind assembly in tight spaces. Raised spider dots on the legs of the spider ensure proper spacing of hubs and spider.

Proper installation of the coupling can provide isolation of electrical currents. Check the CL dimension listed on this page to ensure the proper spacing between spiders and hubs.

The GS Series coupling has spiders available in four different shore hardnesses. Each spider offers benefits for different vibratory, environmental, and torque transmission requirements.
Unit of Measure



N/A GS 38/45B HUB AL 1-1/2 DSC

Hub Style



N/A Curved Jaw Coupling Hubs

Hub Material

N/A Aluminum


N/A Bored


N/A Silver

Bore Type

N/A Solid

Coupling Type

N/A Jaw


N/A 1.3 lb

Dimensional Data

Bore Size 

N/A 1 1/2 in

Spider Size

N/A 38/45

Set Screw Style Coupling Size (Dimension T)

N/A M8

Length thru Bore (Dimensions LTB1/LTB2)

N/A 1.770 in44.96 mm

Outside Diameter

N/A 3.150 in80.00 mm

Overall Coupling Length

N/A 4.490 in114.05 mm

Max. Bore (Dimensions ID1/ID2)

N/A 1.75 in44 mm

Dimension CL

N/A 0.120 in3.05 mm

Dimension G

N/A 0.940 in23.88 mm

Dimension HD

N/A 3.15 in80.01 mm

Clamping Bolt Style Coupling Bolt Location Size (Dimension SL1)

N/A 0.790 in

Dimension TH

N/A 0.160 in4.06 mm

Clamping Bolt Style Coupling Bolt Size

N/A M8

Cubic inches

N/A 17.56283 in³

Performance Data

Normal Temperature Range (with 92 Shore A spider)

N/A -40 to 194 ºF

Max Temp (with 92 Shore A spider)

N/A -50 to 248 ºF

Nominal Torque (with 92 Shore A spider)

N/A 1680 in·lb

Max Torque (with 92 Shore A spider)

N/A 3360 in·lb

Clamping Bolt Style Coupling Torque

N/A 221.25 in·lb

Max. Speed

N/A 4750 rpm

GS Series Hub Design Description

GS Series Hub Design Description

    Clamping Hub With Double Slot Without Keyway (DSC)
  • Transmits torque utilizing a double split clamp to attach hub to shaft. Zero or minimum backlash. Torque capacity of coupling determined by bore size. Available standard for sizes GS 24-55.