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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 SU185-6 CPLG 2.1265X2.2515 KW

Bore Size  

N/A 2.1265 & 2.2515 in

Hub Style

N/A Standard


N/A Disc Coupling


N/A Steel


N/A Bored


N/A 28.30 lb


N/A Metallic

Coupling Series

N/A SU-6

Coupling Type

N/A Disc

Dimensional Data


N/A 185-6

Keyway Size (W x D)

N/A 1/2 x 1/4 Both Ends in

Set Screw Style Coupling Size (Dimension T)

N/A 1/2-13 & 3/8-16

Length thru Bore

N/A 3.150 in80.01 mm

Dimension FD

N/A 7.280 in185.00 mm

Overall Length

N/A 6.850 in174.00 mm

Max. Bore (Dimensions ID1/ID2)

N/A 3.13 in80 mm

Dimension HD

N/A 4.41 in112 mm

Distance between Shaft Ends (Dimension BSE)

N/A 0.551 in14.00 mm

Cubic inches

N/A 363.03904 in³

Performance Data


N/A -40 to 450 ºF

Nominal Torque

N/A 29200 in·lb

Max. Torque

N/A 58400 in·lb

Max. Speed (Unbalanced)

N/A 4200 rpm

Max. Speed (Balanced)

N/A 10500 rpm

Max. Angular Misalignment

N/A 1.50 º

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

N/A 11.50 in·lb/rad

Rated Power at 100 rpm

N/A 46.30 hp34.50 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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