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LF Series Complete Coupling, Model 2 - Threaded Bore x Keyway Bore
Couplings & Power Transmission Parts Catalog
Item # 68514476211
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Item # 68514476211, LF Series Complete Coupling, Model 2 - Threaded Bore x Keyway Bore
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.
Torsional Element Specifications
LF4 MDL2 1"-14 THREADEDX1-1/8
High Temperature Rubber (HTR)
Connection Type A x B
1 x 1 1/8
Set Screw Size
Length thru Bore
Min. Bore (Dimensions ID1/ID2)
Flange Diameter (Dimension FD)
Axial Hole and Division
3 at 120º
Operating Temperature Range
-40 to 194
Allowable Continuous Vibratory Torque
Max. Angular Misalignment
Max. Parallel Misalignment
Wind-Up Angle at Nominal Torque
Wind-Up Angle at Max. Torque
Dynamic Torsional Stiffness
Static Angular Stiffness
Static Axial Stiffness
Static Radial Stiffness
Model 2 and 2/S
Provides a complete shaft-to-shaft coupling in a range of sizes for all industrial power transmission applications. It is similar to Model 1 shown above, except a flanged hub is added to make the shaft to shaft connection.
Model 2/S allows the drive package to be “blind” connected. As with all S-Style models, axial end float of equipment shafts can be accommodated without harmful push-pull force.
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
Shaft to shaft or flywheel to shaft designs
Designed to accommodate substantial shock loads, vibration, and misalignment
Low moment of inertia
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
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).
Torsional Products Catalog
LF Installation Instructions - Models 1, 2, & 3
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