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    The Lovejoy Mini Soft coupling provides protection from misalignment, vibration and shock loads. The simple design of the coupling ensures ease of assembly, installation and reliable performance. No special tools are needed for installation or removal. No lubrication is needed, and once installed and aligned correctly, no maintenance is required.

    The Mini Soft coupling design is comprised of three parts. Two hubs with internal teeth engage an elastomeric flexible center, or sleeve, with external teeth. Misalignment and torsional shock loads are absorbed by shear deflection in the center sleeve element.

    The shear characteristic of the coupling is very well suited to absorb impact. The Lovejoy Mini Soft coupling is designed with tooth contact which provides more surfaces carrying the load resulting in less wear at any one point, and torque that flows more smoothly. Additionally, the coupling allows for axial freedom which results in easier assembly and spacing of shafts. This feature is particularly useful in reducing thrust loads on bearings.

    When operating within its rating, the coupling is torsionally stiff and will not react with twist during operation. The Polyurethane center member sleeve is known for its toughness and resistance to abrasion, and also provides for good damping and shock load capabilities. The MSF coupling consists of two hubs and one center member.
Unit of Measure



N/A MSF25 HUB 5/16 N/KW


N/A Mini Soft, Three Piece Design w/ Sleeve Insert

Coupling Size



N/A Zinc Alloy


N/A Set Screw


N/A Black


N/A 0.09 oz

Weight (Complete Coupling w/ Min. Bores)

N/A 3.00 oz

Dimensional Data

Bore Size 

N/A 5/16 in

Set Screw Size

N/A M4

Keyway Size

N/A No Keyway

Length thru Bore

N/A 0.472 in12.00 mm

Overall Coupling Length

N/A 1.614 in41.00 mm

Outside Diameter

N/A 0.984 in25.00 mm

Min. Bore (Dimensions ID1/ID2)

N/A 0.197 in5.00 mm

Max. Bore (Dimensions ID1/ID2)

N/A 0.472 in12.00 mm

Cubic inches

N/A 1.56277 in³

Performance Data

Normal Temperature Range

N/A 140.00 ºF

Nominal Torque

N/A 13.30 in·lb

Max Speed

N/A 1500.00 rpm

Angular Misalignment

N/A 2.00 º

Parallel Misalignment

N/A 0.010 in

Torsional Stiffness

N/A 106.00 in·lb/rad

Moment of Inertia

N/A 0.0280 lb·in²



  • Easy blind assembly
  • Good shock load absorption
  • Good abrasion resistance
  • Zinc alloy hubs
  • Polyurethane insert



  • Nominal torque, torsional stiffness, weight and moment of inertia are based on minimum bore size.
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