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    The LF Series coupling is designed with a unique and highly versatile elastomeric element. These can be easily integrated into a variety of coupling configurations to meet several application needs. LF Style elements are available in a variety of materials to match the necessary coupling dampening characteristics for tuning the systems critical speed away from the application operating speed.

    The element can be connected axially to a flywheel adapter plate or flanged hub and radially to a cylindrical center hub using the appropriate bolts. Axial bolt styles include either socket head bolts with a special dry adhesive, or S-Style bolts, which are similar to dowel pins (seen picture below). The radial bolts are used to connect the element to the cylindrical hub. This unique design is remarkably simple, highly effective and gives the LF torsional coupling unmatched performance capabilities. The coupling selection should be verified with a Torsional Vibration Analysis (TVA) of the system.
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.


  • For Hytrel, dynamic torsional stiffness values are non-linear with respect to torque. Value given is for 100% of nominal torque.
  • Angular and parallel misalignment values are dependent on speed, and for rubber elements, should be adjusted according to figure 4. Hytrel® elements are only for applications where the driven component is piloted to the driver for SAE and DIN established alignments (i.e. Hydraulic pump flange-mounted to engine flywheel housing).
  • Hytrel® elements are only for applications where the driven component is piloted to the driver for essentially perfect alignment (hydraulic pump flange-mounted to engine housing).




Coupling Size

N/A LF16


N/A Torsional


N/A Flange


N/A 8.48 lb


N/A Metallic

Bore Type

N/A Rough Stock Bore

Dimensional Data

Rough Stock Bore Size

N/A 0.710 in

Thread (Dimension T)

N/A M12

Hub Diameter

N/A 2.760 in70.00 mm

Length thru Bore

N/A 1.970 in50.00 mm

Min. Bore (Dimensions ID1/ID2)

N/A 0.810 in20.00 mm

Max. Bore (Dimensions ID1/ID2)

N/A 2.630 in66.802 mm

Dimension FD

N/A 3.940 in100.08 mm

Dimension FOD

N/A 5.910 in

Cubic inches

N/A 68.80836 in³

Performance Data

Operating Temperature Range

N/A -40 to 194 ºF

Nominal Torque

N/A 1770.00 in·lb

Securing Torque for Mounting Bolt

N/A 4960.00 in·lb

Allowable Continuous Vibratory Torque

N/A 710.00 in·lb

Max. Speed

N/A 6000 rpm


N/A 6000.00 rpm

Max. Angular Misalignment

N/A 3.00 º

Max. Parallel Misalignment

N/A 0.080 in2.00 mm

Wind-Up Angle at Nominal Torque

N/A 5.00 º

Wind-Up Angle at Max. Torque

N/A 14.00 º

Dynamic Torsional Stiffness

N/A 30100.00 in·lb/rad

Static Angular Stiffness

N/A 44.00 in·lb/deg

Static Axial Stiffness

N/A 570.00 lb/in

Static Radial Stiffness

N/A 2860.00 lb/in

Shore Hardness

N/A 60A

Torsional Element Specifications

Torsional Element Specifications

    There are two different rubber element materials available, High Temperature Rubber (HTR) and Neoprene (CR). Both elements are torsionally soft and are placed into compression during assembly. Rubber under compression can carry up to 5 times the amount of torque as non-compressed elements. The elements effectively accommodate shock, misalignment, and vibration plus minimize harmful radial and axial forces on the connected equipment. Neoprene (CR) is used in environments that are hostile to High Temperature Rubber (HTR).
    Available Durometer Hardness:
  • 50, 60 (Shore A scale)
    Operating Temperature Range:
  • HTR: -40° to 194° F
  • CR: -40° to 175° F
    Maximum Angular Misalignment:
  • Up to 3°



  • Wide range of standard designs and materials
  • Application versatility
  • Shaft to shaft or flywheel to shaft designs
  • Designed to accommodate substantial shock loads, vibration, and misalignment
  • Low moment of inertia
  • Electrically insulating
  • No lubrication, maintenance free
  • Unique air-flow cooling design
  • Different element stiffness values allow for torsional tuning of applications with diesel engines
  • Economic design allows for cost effective solutions for torsional applications
  • Proven L-LOC spline-clamping hub virtually eliminates spline shaft profile wear and “fretting”
  • Oil, heat, and corrosion resistant elements (Hytrel®, Zytel®)
  • When used with S-bolts, the coupling can accommodate some end float
  • S-bolts accommodate applications requiring “blind” assembly
  • Model 6 unique spacer designs span gaps between equipment in excess of the normal equipment separation
  • Model 6 design available with bearings for high speeds and large amounts of equipment separation
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