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    The SX Type is the standard coupling type that includes two hubs, a stock length spacer designed to meet industry standard lengths, and two unitized disc packs. The coupling has two flex planes, one at each disc pack, allowing this coupling to accommodate parallel, angular, and axial misalignment with specified limits. The coupling is available in 4, 6, and 8 bolt designs and bore sizes up to 13 inches (330mm) on the largest size. Custom spacer lengths can be manufactured to meet special shaft separations required for specific applications. The SX coupling can be fitted with overload bushings to protect the disc packs in over torque conditions and can act as an anti-flail device. SX couplings are assembled at the time of installation on the equipment where the coupling will be in service.
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 30.56 lb


N/A Metallic

Bore Type

N/A Rough Stock Bore x Rough Stock Bore

Connection Type A x B 

N/A Rough Stock Bore x Rough Stock Bore

Coupling Series

N/A SX-6

Coupling Type

N/A Disc

Dimensional Data


N/A 158-6

Set Screw Style Coupling Size (Dimension T)

N/A No Setscrew

Keyway Sizes (W x D)

N/A No Keyway

Length thru Bore

N/A 2.76 in70.1 mm

Dimension FD

N/A 6.220 in158.00 mm

Overall Length

N/A 10.400 in264.00 mm

Max. Bore (Dimensions ID1/ID2)

N/A 2.760 in70.00 mm

Dimension HD

N/A 3.860 in98.00 mm

Dimension PW

N/A 0.441 in11.20 mm

Dimension S

N/A 4.000 in102.00 mm

Distance between Shaft Ends (Dimension BSE)

N/A 4.875 in123.83 mm

Cubic inches

N/A 402.35936 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

Axial Misalignment (+-D Ka) for couplings with TWO disc packs

N/A 0.122 in3.1 mm

Max. Angular Misalignment (per single disc pack)

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

Rated HP at 875 rpm (Standard Motor)

N/A 28.2 hp

Rated HP at 1,150 rpm (Standard Motor)

N/A 28.2 hp

Rated HP at 1,750 rpm (Standard Motor)

N/A 28.2 hp

Rated HP at 3,500 rpm (Standard Motor)

N/A 28.2 hp



  • Unitized disc pack
  • Infinite life when properly sized and aligned
  • Accommodates angular, axial, and parallel misalignment
  • Torsionally rigid without any back lash
  • No need for lubrication or maintenance
  • No wearing parts and high resistance to harsh environmental conditions
  • Overload Bushings are available
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