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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.




Hub Style

N/A Standard


N/A Disc Coupling


N/A Steel


N/A Unbored


N/A 4.53 lb


N/A Metallic

Connection Type A x B 

N/A Rough Stock Bore x Rough Stock Bore

Coupling Series

N/A SU-6

Coupling Type

N/A Disc

Dimensional Data


N/A 90-6

Set Screw Style Coupling Size (Dimension T)

N/A No Setscrew

Keyway Size (W x D) 1

N/A No Keyway

Keyway Size (W x D) 2

N/A No Keyway

Length thru Bore

N/A 1.570 in39.88 mm

Dimension FD

N/A 3.540 in90.00 mm

Overall Length

N/A 3.44 in88.00 mm

Max. Bore (Dimensions ID1/ID2)

N/A 1.5 in38 mm

Dimension HD

N/A 2.280 in58.00 mm

Distance between Shaft Ends (Dimension BSE)

N/A 0.295 in7.50 mm

Cubic inches

N/A 43.10870 in³

Performance Data


N/A -40 to 450 ºF

Nominal Torque

N/A 2100 in·lb

Peak Torque

N/A 4200 in·lb

Max. Speed (Unbalanced)

N/A 9100 rpm

Max. Speed (Balanced)

N/A 22700 rpm

Max. Angular Misalignment

N/A 1.50 º

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

N/A 2.40 in·lb/rad

Rated Power at 100 rpm

N/A 3.50 hp2.60 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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