3D CAD and 2D Drawings

Find and download 3D CAD and 2D drawings for key Timken products.

    The heart of the LF Series coupling is the flexible base element. This element allows the customer to make their own shaft hubs from steel bar stock or use existing hubs. Ideal for quick prototype testing, retrofit and high volume applications.
Unit of Measure



  • 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 LF30

Coupling Type

N/A Torsional


N/A Hytrel®

Bore Type

N/A Element w/ Hardware


N/A Beige


N/A 4.70 lb

Dimensional Data

Thread (Dimension T)

N/A M16

Length thru Bore

N/A 1.970 in66.00 mm

Dimension HD

N/A 3.937 in100.00 mm

Max. Bore (Dimensions ID1/ID2) - Flanged Hubs

N/A 3.750 in100.00 mm

Cubic inches

N/A 88.16952 in³

Performance Data

Normal Temperature Range

N/A -60 to 250 ºF

Nominal Torque

N/A 4400.00 in·lb500.00 N·m

Max. Torque

N/A 12400.00 in·lb1400.00 N·m

Max. Speed

N/A 4000 rpm

Max. Angular Misalignment

N/A 0.25 º

Max. Parallel Misalignment

N/A 0.000 in0.00 mm

Dynamic Torsional Stiffness

N/A 88000.00 Nm/rad

Dynamic Torsional Stiffness

N/A 780000.00 in·lb/rad

Max. Axial Misalignment (End Float)

N/A +0.12 / -0.08 in+3 / -2 mm

Torsional Element Specifications

Torsional Element Specifications

    Elements made of DuPont’s Hytrel® elastomer compound are torsionally much stiffer than natural rubber (20 times stiffer) and were developed for combustion engine / hydraulic pump applications. Hytrel® elements have 20% greater torque capacity as compared to rubber elements. The torsionally stiff Hytrel® element moves the harmful vibration resonance frequency above the operating RPM range. The element design also reduces harmful radial and axial reactionary forces.
  • Operating Temperature Range: -60° to 250° F
  • Maximum Angular Misalignment: 0.25°



  • 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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