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    Note: SX Type Hubs are interchangeable for both the SU and SX style disc couplings (but not SXC style).
    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.
    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.



N/A SX255-6 HUB 55MM SLD1500 *LTB

Hub Style

N/A Standard


N/A Disc Coupling Hubs

Hub Material

N/A AISI 1045


N/A Bored


N/A Metallic

Coupling Series

N/A SX-6

Coupling Type

N/A Disc


N/A 26.13 lb

Weight (Complete Coupling w/ Max. Bores)

N/A 88.20 lb40.00 Kg

Dimensional Data

Bore Size

N/A 55.00 mm


N/A 255-6

Set Screw Style Coupling Size (Dimension T)

N/A No Setscrew

Keyway Size (W x D)

N/A No Keyway

Keyway Size (W x D) 2

N/A No Keyway

Length thru Bore

N/A 2.65 in67.31 mm

Max. Bore (Dimensions ID1/ID2)

N/A 4.310 in110.00 mm

Dimension FD

N/A 10.040 in255.00 mm

Dimension HD

N/A 6.100 in155.00 mm

Dimension PW

N/A 0.807 in20.50 mm

Dimension S

N/A 6.140 in156.00 mm

Distance between Shaft Ends (Dimension BSE)

N/A 7.750 in197.00 mm

Cubic inches

N/A 1694.47490 in³

Performance Data

Nominal Torque

N/A 90300.00 in·lb10200.00 N·m

Max. Torque

N/A 180600.00 in·lb20400.00 N·m

Max. Speed (Unbalanced)

N/A 3080.00 rpm

Max. Speed (Balanced)

N/A 7700.00 rpm

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

N/A 0.185 in4.70 mm

Max. Angular Misalignment (per single disc pack)

N/A 1.00 º

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

N/A 41.00 in·lb/rad4.70 Nm/rad

Rated Power at 100 rpm

N/A 143.20 hp106.80 kW



  • 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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