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UF Type - Flange-to-Flange
    This coupling is actually the center dropout section of the RRU Type, but it can be purchased separately for direct flange-to-flange mounting of the driving unit to the driven. The UF Type coupling compensates for high misalignment to protect connected equipment, yet it is also well-suited for applications which require negligible backlash or windup and reliability under high temperature conditions. Stock flange sizes are shown in the Dimensional Data table below, but other sizes can be provided to meet special mounting requirements.
    This flange-to-flange type is designed to connect flange mounted equipment to another flange while compensating for misalignment. It is also the center drop out section of the RRU Type.
    Note: The UF Type Drop Out does not come with assembly hardware. Assembly hardware must be purchased separately.
Unit of Measure




Hub Style

N/A Drop Out

Coupling Type

N/A Flange-to-Flange


N/A Steel


N/A Gray/Metallic

# of Mounting Screws Required

N/A 3


N/A 2.10 lb

Dimensional Data


N/A UF100

Set Screw Thread Size (Dimension T)

N/A No Setscrew

Length (Dimension S)

N/A 2.18 in

Min. Bore (Dimension ID)

N/A 0.438 in11.13 mm

Max. Bore (Dimensions ID)

N/A 1.375 in34.93 mm

Dimension BC

N/A 2.680 in68.07 mm

Dimension D

N/A 3.120 in79.25 mm

Dimension FD

N/A 3.250 in82.55 mm

Dimension FL

N/A 0.500 in12.70 mm

Dimension FL1

N/A 0.380 in9.65 mm

Dimension HD

N/A 2.310 in58.67 mm

Dimension S

N/A 2.180 in55.37 mm

Pin Location (Dimension SL)

N/A 0.440 in

Pin Size

N/A 5/16 in

Mounting Screw Thread Size

N/A 5/16-18

Cubic inches

N/A 51.75625 in³

Performance Data

Max. Torque

N/A 565.00 in·lb

Max. Speed

N/A 6000 rpm

Max. Recommended End Play

N/A 0.040 in1.02 mm

Max. Parallel Offset

N/A 0.030 in0.76 mm

Max. Angular Offset

N/A 3.00 º

Wind-Up Angle at Max. Torque

N/A 1.03 º

Rated HP at 100 rpm

N/A 0.90 hp

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.



  • OAL Tolerance + .19 inch.
  • UF Center Drop out Length Tolerance + .12 inch.
  • Mounting screws not supplied.
  • Total backlash is approximately 1/3 of windup at maximum torque – consult Lovejoy Engineering for more information.
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