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 SX228-6 HUB 2-7/8 3/4X3/8KW

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 25.00 lb

Weight (Complete Coupling w/ Max. Bores)

N/A 66.10 lb

Dimensional Data

Bore Size 

N/A 2 7/8 in

Keyway Size (W x D)

N/A 3/4 x 3/8 in


N/A 228-6

Set Screw Size

N/A No Setscrew

Length thru Bore

N/A 3.94 in100.08 mm

Overall Length (for SX Type coupling)

N/A 14.760 in375.00 mm

Max. Bore (Dimensions ID1/ID2)

N/A 3.940 in100.00 mm

Dimension FD

N/A 8.980 in228.00 mm

Dimension HD

N/A 5.510 in140.00 mm

Dimension PW

N/A 0.689 in17.50 mm

Dimension S

N/A 5.500 in140.00 mm

Distance between Shaft Ends (Dimension BSE)

N/A 6.880 in175.00 mm

Cubic inches

N/A 317.72318 in³

Performance Data

Nominal Torque

N/A 62000.00 in·lb

Max. Torque

N/A 123900.00 in·lb

Max. Speed (Unbalanced)

N/A 3400.00 rpm

Max. Speed (Balanced)

N/A 8500.00 rpm

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

N/A 0.165 in

Max. Angular Misalignment (per single disc pack)

N/A 1.00 º

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

N/A 23.00 in·lb/rad

Rated Power at 100 rpm

N/A 98.30 hp73.30 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