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    The SU Type coupling has a single flex plane, and is comprised of a single disc pack kit with two hubs. It is suitable for angular and axial misalignment only. Two SU couplings are often combined with a shaft to make a floating shaft coupling. The shaft can be hollow for long light weight floating shaft couplings.
Unit of Measure



N/A Lovejoy: CAD Models are accurate envelope dimensions only. Features such as bore size and keyway are not rendered or are only representative. Contact Lovejoy Technical Support or refer to product catalogs for details.



N/A SU158-6 CPLG 1-3/4X2-7/16 KWBE

Bore Size  

N/A 1-3/4 & 2-7/16 in

Hub Style

N/A Standard


N/A Disc Coupling


N/A Steel


N/A Bored


N/A 17.39 lb


N/A Metallic

Coupling Series

N/A SU-6

Coupling Type

N/A Disc

Dimensional Data


N/A 158-6

Keyway Size (W x D)

N/A 3/8 x 3/16 & 5/8 x 5/16 in

Set Screw Style Coupling Size (Dimension T)

N/A No Setscrew

Length thru Bore

N/A 2.76 in70.1 mm

Dimension FD

N/A 6.220 in158.00 mm

Overall Length

N/A 5.960 in151.00 mm

Max. Bore (Dimensions ID1/ID2)

N/A 2.750 in70.00 mm

Dimension HD

N/A 3.860 in98.00 mm

Distance between Shaft Ends (Dimension BSE)

N/A 0.441 in11.20 mm

Cubic inches

N/A 230.58286 in³

Performance Data


N/A -40 to 450 ºF

Nominal Torque

N/A 17700 in·lb

Max. Torque

N/A 35400 in·lb

Max. Speed (Unbalanced)

N/A 4920 rpm

Max. Speed (Balanced)

N/A 12300 rpm

Max. Angular Misalignment

N/A 1.50 º

Torsional Stiffness x 10^6 (of one disc pack)

N/A 5.8 in·lb/rad

Rated Power at 100 rpm

N/A 28.2 hp21 kW



  • Unitized disc pack
  • Infinite life when properly aligned
  • Torsionally rigid without any back lash
  • No need for lubrication or maintenance
  • No wearing parts and high resistance to harsh environmental conditions
  • Larger sizes are available upon request
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