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UFH Type - Flange-to-Shaft
    A flange-to-shaft configuration, this couples flange mounted equipment to a shaft with all the benefits of Uniflex versatility. The stock flange plate is the same as used on the UF Type.

    The one-piece UFH Type coupling is similar to the U Type, except that one hub is replaced by a flange plate. Stock flange sizes are shown in the Dimensional Data table below but other sizes can be made to order. As with the other Uniflex styles, this coupling compensates for high degrees of angular and parallel misalignment with very little backlash or windup and is reliable in harsh or severe environments.

    Regular and short versions are available for each size to accommodate different overall length requirements. For increased versatility, the hub can be modified with a tapered, spline, hex or square bore. The standard hub is furnished with either a pre-drilled pin hole or with a keyway and set screw. Specify when ordering.
    Note: The UFH Type coupling does not come with assembly hardware. Assembly hardware must be purchased separately.
Unit of Measure



N/A UFH125R CPLG 3/4 3/16X3/32K

Hub Style

N/A Regular


N/A Flange-to-Shaft


N/A Steel


N/A 3.00 lb


N/A Gray/Metallic

Bore Type

N/A Finished Bore

# of Mounting Screws Required

N/A 3

Dimensional Data

Bore Size 

N/A 3/4 in

Hub Size


Set Screw Thread Size (Dimension T)

N/A 3/8-16

Keyway Size (W x D)

N/A 3/16 x 3/32 in

Dimension HD

N/A 2.170 in55.12 mm

Overall Length

N/A 3.75 in95.25 mm

Pin Location (Dimension SL)

N/A 0.62 in

Length thru Bore

N/A 1.280 in32.51 mm

Min. Bore (Dimensions ID1/ID2)

N/A 0.625 in15.88 mm

Max. Bore (Dimensions ID1/ID2)

N/A 1.25 in32.00 mm

Dimension BC

N/A 3.120 in79.25 mm

Dimension D

N/A 3.560 in90.42 mm

Flange Diameter (Dimension FD)

N/A 3.680 in93.47 mm

Dimension FL

N/A 0.500 in12.70 mm

Mounting Screw Thread Size

N/A 5/16-18

Cubic inches

N/A 50.78400 in³

Performance Data

Operating Temperature Range

N/A -40 to 250 ºF

Max. Torque

N/A 755 in·lb

Max. Speed

N/A 6000 rpm

Max. Recommended End Play

N/A 0.040 in1.02 mm

Max. Parallel Offset

N/A 0.044 in1.12 mm

Wind-Up Angle at Nominal Torque

N/A 1.85 º

Wind-Up Angle at Max. Torque

N/A 4.5 º

Rated HP at 100 rpm

N/A 1.21 hp

# of Set Screws Required

N/A 1

Coupling Design

Coupling Design

N/A Flexible Spring Type Coupling with Exclusive Triple Wound Spring Design
    The Uniflex Coupling is an all steel, single piece coupling that solves a variety of application concerns including: high misalignment, space limitations, high temperature, and exceptionally low backlash/windup. The unique flexing center of the Uniflex consists of three opposingly wound square wire springs for forward or reverse operation. Two steel hubs are then brazed to the steel spring pack to create a durable one-piece flexible coupling.



  • Total backlash is approximately 1/3 of windup at maximum torque – consult Lovejoy Engineering for more information.
  • OAL & Dimension FL Tolerance + .12 inch.
  • Mounting screws not supplied.
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