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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

Specifications

Description 

 N/A GS38-SPIDER-98A RED-URE

Type

 N/A Jaw

Spider Type

 N/A 98 Shore A

Material

 N/A Urethane

Style

 N/A Solid Center Type

Color

 N/A Red

Weight

 N/A 0.11 lb

Stock Sizes

 N/A 14 - 55

Dimensional Data

Spider Size

 N/A 38

Spider Outside Diameter (Dimension A)

 N/A 3.150 in

Spider Thickness (Dimension W)

 N/A 0.710 in18.03 mm

Cubic inches

 N/A 7.04498 in³

Dimensional Data of Related Coupling

Set Screw Size

 N/A 5/16-18

Set Screw Style Coupling Location Size (Dimension SL)

 N/A 0.590 in14.99 mm

Length thru Bore

 N/A 1.770 in44.96 mm

Dimension HD

 N/A 3.150 in80.00 mm

Min. Bore (Dimensions ID1/ID2)

 N/A Solid

Max. Bore (Dimensions ID1/ID2)

 N/A 1.75 in44 mm

Dimension CL

 N/A 0.120 in3.05 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

Performance Data

Temperature 

 N/A -30 to 194 ºF

Max. Temperature Range

 N/A -40 to 248 ºF

Nominal Torque

 N/A 2876.00 in·lb

Max. Torque

 N/A 5752.00 in·lb

Max. Speed for Clamping Style Hub

 N/A 4750 rpm

Max. Speed for Set Screw Style Hub

 N/A 5950.00 rpm

Performance Data of Related Coupling

Max. Speed for Locking Device Style Hub

 N/A 9550.00 rpm

Axial Misalignment

 N/A +0.070 -0.027 in

Angular Misalignment

 N/A 0.90 º

Radial Misalignment

 N/A 0.005 in

Dynamic Torsional Stiffness

 N/A 190151.00 in·lb/rad

Static Torsional Stiffness

 N/A 63366.00 in·lb/rad

Radial Stiffness

 N/A 25146.0000 in·lb

Elastomer Characteristic

Elastomer Characteristic

 N/A
  • Four types of spiders are available for the CJ Series of couplings
  • Urethane spiders provide high abrasion resistance and elasticity, along with good damping characteristics
  • The spiders are offered in a variety of shore hard nesses, each providing a different level of torque capacity, damping, and chemical resistance
  • The 92A shore insert (yellow in color) is the standard, offering excellent torque carrying capacity
  • The 80A shore insert (blue) offers the best damping characteristics
  • The 95/98A shore spider (red) offers higher torque than the standard 92 shore, but retains greater damping capacity compared to the 64D shore insert (green)
  • The 64D shore insert is offered for high humidity environments, higher temperatures, and offers the highest torque capacity
  • The standard curved jaw spider design has a hole in the center to accommodate small between shaft end measurements
  • The 80A, 92A, and 95/98A shore spiders have a temperature capacity of 212° F
  • The 64D shore spider has a temperature capacity of 230° F
  • The curved jaw spider’s urethane material also resists oil, dirt, sand, grease, moisture, many solvents, as well as atmospheric effects of ozone

Misalignment Information

Misalignment Information

 N/A
    The GS Series coupling handles the following types of misalignment: axial, angular, and radial. The coupling retains its zero backlash properties due to its spider design.
Axial Misalignment
    Axial misalignment can be caused by different shaft tolerances or by thermal expansion of shafts. The GS Series coupling handles axial misalignment while keeping reactionary forces low.
Radial Misalignment
    Radial misalignment can be defined as a measure of the offset distance between the centerlines of the driving and driven shafts. This type of misalignment, due to the forces involved, causes the highest stress.
Angular Misalignment
    Angular misalignment can be defined as a measure of the angle between the centerlines of the driving and driven shafts, where those centerlines would intersect approximately halfway between shaft ends. The GS Series coupling can handle a specific amount of angular misalignment for each given size (refer to chart on right).

Typical Applications

Typical Applications

 N/A Positioning Drivers, Main Spindle Drivers, High Load Applications

Features

Features 

 N/A
  • Simple 3 piece jaw design
  • Aluminum and steel material hubs
  • Clamping and locking device hubs available
  • Four different types of urethane shores to choose from
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