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 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